diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..9df12b2
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+*.pyc
+.tox
+*.egg-info
+.vagrant
diff --git a/3rdparty/README.md b/3rdparty/README.md
new file mode 100644
index 0000000..d650b96
--- /dev/null
+++ b/3rdparty/README.md
@@ -0,0 +1,4 @@
+Place any bleeding edge versions of packages here so that they may be picked up by tox during
+testing.
+
+This is also the place for the required `mesos.native` packages because they are platform specific.
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e06d208
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,202 @@
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diff --git a/README.md b/README.md
new file mode 100644
index 0000000..5cb76f4
--- /dev/null
+++ b/README.md
@@ -0,0 +1,54 @@
+# Mysos
+Mysos is an Apache Mesos framework for running MySQL instances. It dramatically simplifies the management of a MySQL cluster and is designed to offer:
+
+ * Efficient hardware utilization through multi-tenancy (in performance-isolated containers)
+ * High reliability through preserving the MySQL state during failure and automatic backing up to/restoring from HDFS
+ * An automated self-service option for bringing up new MySQL clusters
+ * High availability through automatic MySQL master failover
+ * An elastic solution that allows users to easily scale up and down a MySQL cluster by changing the number of slave instances
+ 
+Mysos is also being [proposed as a project in the Apache Incubator](https://wiki.apache.org/incubator/MysosProposal).
+
+## Documentation
+A [user guide](docs/user-guide.md) is available. Documentation improvements are always welcome, so please send patches our way.
+
+## Getting Involved
+The project maintains an IRC channel, `#mysos` on irc.freenode.net
+
+## License
+Licensed under the Apache License, Version 2.0: http://www.apache.org/licenses/LICENSE-2.0
+
+## Requirements
+ * Python 2.7
+ * Mesos Python bindings
+
+## Building and Testing
+### Build/Download Mesos Python Bindings
+Mysos uses Mesos Python bindings which consist of two Python packages. `mesos.interface` is on PyPI
+and gets automatically installed but `mesos.native` is platform dependent. You need to either build
+the package on your machine ([instructions](http://mesos.apache.org/gettingstarted/)) or download a
+compiled one for your platform (e.g. Mesosphere hosts
+[the eggs for some Linux platforms](https://mesosphere.com/downloads/)).
+
+Since `pip` doesn't support eggs, you need to convert eggs into wheels using `wheel convert`, then
+drop them into the `3rdparty` folder. See the [README file](3rdparty/README.md) for more
+information.
+
+### Unit Tests
+Make sure [tox](https://tox.readthedocs.org/en/latest/) is installed and a `mesos.native` wheel for
+your platform is placed in `3rdparty/`. Then run:
+
+    tox
+
+Tox also builds the Mysos source package and drops it in `.tox/dist`.
+
+### End-to-end test in the Vagrant VM
+The Vagrant test uses the `sdist` Mysos package in `.tox/dist` so be sure to run `tox` first. Then:
+
+    vagrant up
+    
+    # Wait for the VM and Mysos API endpoint to come up (http://192.168.33.17:55001 becomes available).
+    
+    ./vagrant/test.sh
+
+`test.sh` verifies that Mysos successfully creates a MySQL cluster and then deletes it.
diff --git a/Vagrantfile b/Vagrantfile
new file mode 100644
index 0000000..a825670
--- /dev/null
+++ b/Vagrantfile
@@ -0,0 +1,21 @@
+# -*- mode: ruby -*-
+# vi: set ft=ruby :
+
+# Vagrantfile API/syntax version. Don't touch unless you know what you're doing!
+VAGRANTFILE_API_VERSION = "2"
+
+# 1.5.0 is required to use vagrant cloud images.
+# https://www.vagrantup.com/blog/vagrant-1-5-and-vagrant-cloud.html
+Vagrant.require_version ">= 1.5.0"
+
+Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
+  config.vm.box = "ubuntu/trusty64"
+
+  config.vm.define "devcluster" do |dev|
+    dev.vm.network :private_network, ip: "192.168.33.17"
+    dev.vm.provider :virtualbox do |vb|
+      vb.customize ["modifyvm", :id, "--memory", "2048"]
+    end
+    dev.vm.provision "shell", path: "vagrant/provision-dev-cluster.sh"
+  end
+end
diff --git a/docs/user-guide.md b/docs/user-guide.md
new file mode 100644
index 0000000..682cc90
--- /dev/null
+++ b/docs/user-guide.md
@@ -0,0 +1,88 @@
+# Using Mysos
+
+Mysos provides a REST API for creating and managing MySQL clusters on Mesos.
+
+## Dashboard
+- HTTP Method: `GET`
+- Path:  `/`
+
+The root of API endpoint is a web page that lists the managed MySQL clusters.
+
+## Creating a MySQL cluster
+- HTTP Method: `POST`
+- Path: `/clusters/<cluster_name>`
+
+
+### Parameters
+- `cluster_name`: Name of the cluster.
+- `cluster_user`: The user account for all MySQL instances in the cluster which as full admin
+privileges.
+- `num_nodes`: Number of nodes in the cluster. [default: 3]
+- `backup_id`: An ID for the MySQL backup to restore from when the MySQL instance starts. If not
+specified, Mysos will start an empty MySQL instance. The format and meaning of `backup_id` is
+specific to the implementation of `BackupStore` that the Mysos cluster uses.
+
+`cluster_name` is part of the path and the rest of the parameters are specified as form fields.
+
+
+### Response
+A JSON object with the following fields:
+
+- `cluster_password`: The password for accessing the MySQL instance (associated with `cluster_user`).
+- `cluster_url`: A URL to the ZooKeeper group for discovering the MySQL instances of this cluster.
+See the *Service Discovery* section below.
+
+
+### Example
+```
+# Create a cluster named 'test_cluster3' and restore from the backup 'foo/bar:201503122000'.
+curl -X POST 192.168.33.7/clusters/test_cluster3 --form "cluster_user=mysos" --form "num_nodes=2" --form "num_nodes=2" --form "backup_id=foo/bar:201503122000"
+# Response
+{"cluster_password": "w9gMCkecsMh6sWsRdxNTa", "cluster_url": "zk://mysos:mysos@192.168.33.7:2181/mysos/discover/test_cluster3"}
+```
+
+### Notes
+- Cluster creation is asynchronous. The API call returns (with status 200) as soon as the Mysos
+scheduler has accepted the request. The same goes for cluster deletion.
+- ZooKeeper `<cluster_url>/master` sub-group has at most one ZNode which is the master of the MySQL
+cluster.
+- ZooKeeper `<cluster_url>/slaves` sub-group can have multiple ZNodes which are the slaves of the
+MySQL cluster.
+- A ZNode is added to the ZooKeeper group when the instance becomes available and ready to serve
+traffic.
+
+## Removing a MySQL cluster
+- HTTP Method: `DELETE`
+- Path: `/clusters/<cluster_name>`
+
+### Parameters
+- `cluster_name`: Name of the cluster.
+- `password`: The password for the cluster returned by cluster creation call.
+
+### Response
+A JSON object with:
+
+- `cluster_url`: A URL to the ZooKeeper group to watch for the termination of the cluster. The group
+ ZNode is removed from ZooKeeper when the MySQL cluster is removed/terminated.
+
+### Example
+```
+# Remove a cluster named 'test_cluster3'
+curl -X DELETE 192.168.33.7/cluster/test_cluster3 --form "password=w9gMCkecsMh6sWsRdxNTa"
+# Response
+{"cluster_url": "zk://mysos:mysos@192.168.33.7:2181/mysos/discover/test_cluster3"}
+```
+
+## Service Discovery
+Mysos' service discovery with ZooKeeper conforms to the ServerSet protocol. Each MySQL instance is
+represented by a ZNode with its data being a
+[ServiceInstance](https://github.com/twitter/commons/blob/master/src/thrift/com/twitter/thrift/endpoint.thrift)
+serialized into JSON.
+
+- The `Endpoint serviceEndpoint` field in ServiceInstance has the `host` and `port` that MySQL
+client can connect to.
+- Some utilities for watching ZooKeeper and parsing the `ServiceInstance`s:
+[Java src](https://github.com/twitter/commons/tree/master/src/java/com/twitter/common/zookeeper) |
+[Maven](http://maven.twttr.com/com/twitter/zookeeper-client/LATEST/),
+[Python src](https://github.com/twitter/commons/tree/master/src/python/twitter/common/zookeeper) |
+[PyPI](https://pypi.python.org/pypi/twitter.common.zookeeper/).
diff --git a/setup.py b/setup.py
new file mode 100644
index 0000000..b201d8a
--- /dev/null
+++ b/setup.py
@@ -0,0 +1,76 @@
+import os
+from setuptools import setup, find_packages
+
+
+COMMONS_VERSION = '==0.3.2'
+MESOS_VERSION = '==0.20.1'
+
+
+here = os.path.abspath(os.path.dirname(__file__))
+
+
+def make_commons_requirement(name):
+  return 'twitter.common.{0}{1}'.format(name, COMMONS_VERSION)
+
+
+def list_package_data_files(package_root, data_folder):
+  """List the data files in the data_folder under the given package_root."""
+  paths = []
+  for root, _, files in os.walk(os.path.join(package_root, data_folder)):
+    for filename in files:
+      paths.append(os.path.relpath(os.path.join(root, filename), package_root))
+
+  return paths
+
+
+setup(
+    name='mysos',
+    version='0.1.0-dev0',
+    description='Mysos (MySQL on Mesos)',
+    url='https://github.com/twitter/mysos',
+    license='Apache License, Version 2.0',
+    classifiers=[
+        'Development Status :: 3 - Alpha',
+        'Programming Language :: Python :: 2',
+        'Programming Language :: Python :: 2.7',
+    ],
+    keywords='mesos mysql',
+    packages=find_packages(exclude=['tests*']),
+    namespace_packages=['twitter'],
+    package_data={
+        '': (list_package_data_files('twitter/mysos/executor', 'files') +
+             list_package_data_files('twitter/mysos/scheduler', 'assets'))
+    },
+    install_requires=[
+        'cherrypy==3.2.2',
+        'kazoo==1.3.1',
+        'mako==0.4.0',
+        'mesos.interface{0}'.format(MESOS_VERSION),
+        'mesos.native{0}'.format(MESOS_VERSION),
+        'mysql-python',
+        'pyyaml==3.10',
+        'sqlalchemy',
+        'zake==0.2.1',
+        make_commons_requirement('app'),
+        make_commons_requirement('collections'),
+        make_commons_requirement('concurrent'),
+        make_commons_requirement('exceptions'),
+        make_commons_requirement('http'),
+        make_commons_requirement('lang'),
+        make_commons_requirement('log'),
+        make_commons_requirement('quantity'),
+        make_commons_requirement('zookeeper'),
+    ],
+    extras_require={
+        'test': ['webtest',],
+    },
+    entry_points={
+        'console_scripts': [
+            'mysos_scheduler=twitter.mysos.scheduler.mysos_scheduler:proxy_main',
+            'mysos_executor=twitter.mysos.executor.mysos_executor:proxy_main',
+            'vagrant_mysos_executor=twitter.mysos.executor.testing.vagrant_mysos_executor:proxy_main',
+            'fake_mysos_executor=twitter.mysos.executor.testing.fake_mysos_executor:proxy_main',
+            'mysos_test_client=twitter.mysos.testing.mysos_test_client:proxy_main',
+        ],
+    },
+)
diff --git a/tests/mysos/common/test_cluster.py b/tests/mysos/common/test_cluster.py
new file mode 100644
index 0000000..2624b5c
--- /dev/null
+++ b/tests/mysos/common/test_cluster.py
@@ -0,0 +1,209 @@
+import Queue
+import threading
+import unittest
+
+from twitter.common.zookeeper.serverset.endpoint import Endpoint, ServiceInstance
+from twitter.mysos.common.cluster import ClusterListener, ClusterManager
+
+from kazoo.handlers.threading import SequentialThreadingHandler
+import pytest
+from zake.fake_client import FakeClient
+from zake.fake_storage import FakeStorage
+
+
+class CallbackHandler(object):
+  """Utility for testing callbacks."""
+
+  def __init__(self):
+    self.promoted = threading.Event()
+    self.demoted = threading.Event()
+    self.detected = Queue.Queue()
+    self.terminated = threading.Event()
+
+  def promotion_callback(self):
+    self.promoted.set()
+
+  def demotion_callback(self):
+    self.demoted.set()
+
+  def master_callback(self, master):
+    self.detected.put(master)
+
+  def termination_callback(self):
+    self.terminated.set()
+
+
+class TestCluster(unittest.TestCase):
+  def setUp(self):
+    self.storage = FakeStorage(SequentialThreadingHandler())
+    self.client = FakeClient(storage=self.storage)
+    self.client.start()
+
+  def tearDown(self):
+    self.client.stop()
+
+  def test_add_member(self):
+    manager = ClusterManager(self.client, "/home/my_cluster")
+
+    instance1 = ServiceInstance(Endpoint("host1", 10000))
+    member1 = manager.add_member(instance1)
+    assert member1 == manager.add_member(instance1)  # Second insertion is ignored.
+
+    instance2 = ServiceInstance(Endpoint("host2", 10000))
+    manager.add_member(instance2)
+
+    assert len(manager._cluster.members) == 2
+
+    assert (self.storage.paths["/home/my_cluster/slaves/member_0000000000"]["data"] ==
+            ServiceInstance.pack(instance1))
+    assert (self.storage.paths["/home/my_cluster/slaves/member_0000000001"]["data"] ==
+            ServiceInstance.pack(instance2))
+
+  def test_promote_member(self):
+    manager = ClusterManager(self.client, "/home/my_cluster")
+    instance = ServiceInstance(Endpoint("host", 10000))
+    member = manager.add_member(instance)
+
+    assert manager.promote_member(member)
+    assert not manager.promote_member(member)  # The 2nd promotion is a no-op.
+
+    assert (self.storage.paths["/home/my_cluster/master/member_0000000000"]["data"] ==
+            ServiceInstance.pack(instance))
+
+  def test_remove_member(self):
+    manager = ClusterManager(self.client, "/home/my_cluster")
+    instance = ServiceInstance(Endpoint("host", 10000))
+    member = manager.add_member(instance)
+
+    assert manager.remove_member(member)
+    assert not manager.remove_member(member)  # The second deletion is ignored.
+
+    assert "/home/my_cluster/master/member_0000000000" not in self.storage.paths
+
+  def test_callbacks(self):
+    manager = ClusterManager(self.client, "/home/my_cluster")
+
+    # Set up 2 listeners.
+    instance1 = ServiceInstance(Endpoint("host1", 10000))
+    handler1 = CallbackHandler()
+    listener1 = ClusterListener(
+        self.client,
+        "/home/my_cluster",
+        instance1,
+        handler1.promotion_callback,
+        handler1.demotion_callback,
+        handler1.master_callback,
+        handler1.termination_callback)
+    listener1.start()
+    member1 = manager.add_member(instance1)
+
+    instance2 = ServiceInstance(Endpoint("host2", 10000))
+    handler2 = CallbackHandler()
+    listener2 = ClusterListener(
+        self.client,
+        "/home/my_cluster",
+        instance2,
+        handler2.promotion_callback,
+        handler2.demotion_callback,
+        handler2.master_callback)
+    listener2.start()
+    member2 = manager.add_member(instance2)
+
+    # Test promotion.
+    manager.promote_member(member1)
+
+    assert handler1.promoted.wait(1)
+    assert handler2.detected.get(True, 1) == instance1
+
+    assert (self.storage.paths["/home/my_cluster/master/member_0000000000"]["data"] ==
+            ServiceInstance.pack(instance1))
+    assert (self.storage.paths["/home/my_cluster/slaves/member_0000000001"]["data"] ==
+            ServiceInstance.pack(instance2))
+
+    manager.promote_member(member2)
+
+    assert handler1.demoted.wait(1)
+    assert handler2.promoted.wait(1)
+
+    assert (self.storage.paths["/home/my_cluster/master/member_0000000001"]["data"] ==
+            ServiceInstance.pack(instance2))
+    assert "/home/my_cluster/master/member_0000000000" not in self.storage.paths
+
+    manager.remove_member(member2)
+    assert handler2.demoted.wait(1)
+
+    # Test removing cluster.
+    manager.remove_member(member1)
+    manager.delete_cluster()
+    assert handler1.terminated.wait(1)
+
+  def test_invalid_arguments(self):
+    client = FakeClient()
+    client.start()
+    manager = ClusterManager(client, "/home/my_cluster")
+
+    with pytest.raises(ValueError) as e:
+      manager.promote_member("123")
+    assert e.value.message == 'Invalid member_id: 123'
+
+  def test_invalid_znode(self):
+    instance1 = ServiceInstance(Endpoint("host1", 10000))
+    handler1 = CallbackHandler()
+    listener1 = ClusterListener(
+        self.client,
+        "/home/my_cluster",
+        instance1,
+        handler1.promotion_callback,
+        handler1.demotion_callback,
+        handler1.master_callback)
+    listener1.start()
+
+    self.client.ensure_path("/home/my_cluster/master")
+    self.client.create("/home/my_cluster/master/member_", "Invalid Data", sequence=True)
+
+    # Invalid ZNode data translates into a 'None' return.
+    assert handler1.detected.get(True, 1) is None
+
+  def test_existing_zk(self):
+    """
+      ClusterManager needs to be able to recover from an existing ZK group for scheduler failover.
+    """
+    manager = ClusterManager(self.client, "/home/my_cluster")
+
+    instance1 = ServiceInstance(Endpoint("host1", 10000))
+    member1 = manager.add_member(instance1)
+    instance2 = ServiceInstance(Endpoint("host2", 10000))
+    member2 = manager.add_member(instance2)
+
+    assert (self.storage.paths["/home/my_cluster/slaves/member_0000000000"]["data"] ==
+            ServiceInstance.pack(instance1))
+    assert (self.storage.paths["/home/my_cluster/slaves/member_0000000001"]["data"] ==
+            ServiceInstance.pack(instance2))
+
+    manager.promote_member(member1)
+
+    # Test the new ClusterManager.
+    manager2 = ClusterManager(self.client, "/home/my_cluster")
+    assert len(manager2._cluster.members) == 2
+    assert member1 in manager2._cluster.members
+    assert member2 in manager2._cluster.members
+    assert manager2._cluster.members[member1] == ServiceInstance.pack(instance1)
+
+  def test_remove_cluster(self):
+    manager = ClusterManager(self.client, "/home/my_cluster")
+
+    instance1 = ServiceInstance(Endpoint("host1", 10000))
+    member1 = manager.add_member(instance1)
+    instance2 = ServiceInstance(Endpoint("host2", 10000))
+    member2 = manager.add_member(instance2)
+
+    manager.promote_member(member1)
+
+    with pytest.raises(ClusterManager.Error) as e:
+      manager.delete_cluster()
+
+    manager.remove_member(member1)
+    manager.remove_member(member2)
+    manager.delete_cluster()
+
+    assert "/home/my_cluster" not in self.storage.paths
diff --git a/tests/mysos/common/test_zookeeper.py b/tests/mysos/common/test_zookeeper.py
new file mode 100644
index 0000000..433e2a8
--- /dev/null
+++ b/tests/mysos/common/test_zookeeper.py
@@ -0,0 +1,26 @@
+from twitter.mysos.common.zookeeper import parse
+
+import pytest
+
+
+def test_parse():
+  assert parse("zk://host1:port1") == (None, "host1:port1", "/")
+  assert parse("zk://jake:1@host1:port1") == ("jake:1", "host1:port1", "/")
+  assert parse("zk://jake:1@host1:port1/") == ("jake:1", "host1:port1", "/")
+  assert (parse("zk://jake:1@host1:port1,host2:port2") ==
+          ("jake:1", "host1:port1,host2:port2", "/"))
+  assert (parse("zk://jake:1@host1:port1,host2:port2/") ==
+          ("jake:1", "host1:port1,host2:port2", "/"))
+  assert (parse("zk://jake:1@host1:port1,host2:port2/path/to/znode") ==
+          ("jake:1", "host1:port1,host2:port2", "/path/to/znode"))
+
+
+def test_parse_errors():
+  with pytest.raises(ValueError) as e:
+    parse("host1:port1")
+  assert e.value.message == "Expecting 'zk://' at the beginning of the URL"
+
+  # This method doesn't validate the values in the tuple.
+  assert parse("zk://") == (None, "", "/")
+  assert parse("zk://host_no_port") == (None, "host_no_port", "/")
+  assert parse("zk://jake@host") == ("jake", "host", "/")
diff --git a/tests/mysos/executor/test_mysos_task_runner.py b/tests/mysos/executor/test_mysos_task_runner.py
new file mode 100644
index 0000000..48c16ed
--- /dev/null
+++ b/tests/mysos/executor/test_mysos_task_runner.py
@@ -0,0 +1,207 @@
+import os
+import signal
+import unittest
+
+from twitter.common.concurrent import deadline
+from twitter.common.quantity import Amount, Time
+from twitter.common.zookeeper.serverset.endpoint import Endpoint, ServiceInstance
+from twitter.mysos.common.cluster import ClusterManager
+from twitter.mysos.common.testing import Fake
+from twitter.mysos.executor.noop_installer import NoopPackageInstaller
+from twitter.mysos.executor.mysos_task_runner import MysosTaskRunner
+from twitter.mysos.executor.task_runner import TaskError
+from twitter.mysos.executor.testing.fake import FakeTaskControl
+
+from kazoo.handlers.threading import SequentialThreadingHandler
+import pytest
+from zake.fake_client import FakeClient
+from zake.fake_storage import FakeStorage
+
+
+if 'MYSOS_DEBUG' in os.environ:
+  from twitter.common import log
+  from twitter.common.log.options import LogOptions
+  LogOptions.set_stderr_log_level('google:DEBUG')
+  LogOptions.set_simple(True)
+  log.init('mysos_tests')
+
+
+class FakeStateManager(Fake): pass
+
+
+class TestTaskRunner(unittest.TestCase):
+  def setUp(self):
+    self._storage = FakeStorage(SequentialThreadingHandler())
+    self._client = FakeClient(storage=self._storage)
+    self._client.start()
+    self._self_instance = ServiceInstance(Endpoint("host", 10000))
+    self._state_manager = FakeStateManager()
+
+  def tearDown(self):
+    self._client.stop()
+
+  def test_stop(self):
+    task_control = FakeTaskControl()
+    runner = MysosTaskRunner(
+        self._self_instance,
+        self._client,
+        "/home/test/my_cluster",
+        NoopPackageInstaller(),
+        task_control,
+        self._state_manager)
+    runner.start()
+    assert runner.stop()
+
+    # Killed by SIGTERM.
+    assert deadline(runner.join, Amount(1, Time.SECONDS)) == -signal.SIGTERM
+
+  def test_demote(self):
+    task_control = FakeTaskControl()
+    runner = MysosTaskRunner(
+        self._self_instance,
+        self._client,
+        "/home/test/my_cluster",
+        NoopPackageInstaller(),
+        task_control,
+        self._state_manager)
+
+    manager = ClusterManager(self._client, "/home/test/my_cluster")
+    runner.start()
+
+    self_member = manager.add_member(self._self_instance)
+
+    # 'self_instance' becomes the master.
+    manager.promote_member(self_member)
+
+    runner.promoted.wait(1)
+
+    another_member = manager.add_member(ServiceInstance(Endpoint("another_host", 10000)))
+
+    # This demotes 'self_instance', which should cause runner to stop.
+    manager.promote_member(another_member)
+
+    assert deadline(runner.join, Amount(1, Time.SECONDS))
+
+  def test_reparent(self):
+    task_control = FakeTaskControl()
+    runner = MysosTaskRunner(
+        self._self_instance,
+        self._client,
+        "/home/test/my_cluster",
+        NoopPackageInstaller(),
+        task_control,
+        self._state_manager)
+
+    manager = ClusterManager(self._client, "/home/test/my_cluster")
+    runner.start()
+
+    # Promote another instance.
+    master = ServiceInstance(Endpoint("another_host", 10000))
+    another_member = manager.add_member(master)
+    manager.promote_member(another_member)
+
+    assert runner.master.get(True, 1) == master
+
+    assert runner.stop()
+    assert deadline(runner.join, Amount(1, Time.SECONDS))
+
+  def test_mysqld_error(self):
+    task_control = FakeTaskControl(mysqld="exit 123")
+    runner = MysosTaskRunner(
+        self._self_instance,
+        self._client,
+        "/home/test/my_cluster",
+        NoopPackageInstaller(),
+        task_control,
+        self._state_manager)
+
+    runner.start()
+    assert deadline(runner.join, Amount(1, Time.SECONDS)) == 123
+
+  def test_start_command_error(self):
+    task_control = FakeTaskControl(start_cmd="exit 1")
+    runner = MysosTaskRunner(
+        self._self_instance,
+        self._client,
+        "/home/test/my_cluster",
+        NoopPackageInstaller(),
+        task_control,
+        self._state_manager)
+
+    with pytest.raises(TaskError) as e:
+      runner.start()
+    assert e.value.message.startswith("Failed to start MySQL task")
+
+  def test_promote_command_error(self):
+    task_control = FakeTaskControl(promote_cmd="exit 1")
+    runner = MysosTaskRunner(
+        self._self_instance,
+        self._client,
+        "/home/test/my_cluster",
+        NoopPackageInstaller(),
+        task_control,
+        self._state_manager)
+
+    manager = ClusterManager(self._client, "/home/test/my_cluster")
+    runner.start()
+
+    self_member = manager.add_member(self._self_instance)
+
+    # 'self_instance' becomes the master.
+    manager.promote_member(self_member)
+
+    runner.promoted.wait(1)
+
+    with pytest.raises(TaskError) as e:
+      runner.join()
+    assert e.value.message.startswith("Failed to promote the slave")
+
+  def test_get_log_position(self):
+    task_control = FakeTaskControl(position=1)
+    runner = MysosTaskRunner(
+        self._self_instance,
+        self._client,
+        "/home/test/my_cluster",
+        NoopPackageInstaller(),
+        task_control,
+        self._state_manager)
+
+    runner.start()
+    assert runner.get_log_position() == 1
+
+  def test_get_log_position_error(self):
+    task_control = FakeTaskControl(get_log_position_cmd="exit 1")
+    runner = MysosTaskRunner(
+        self._self_instance,
+        self._client,
+        "/home/test/my_cluster",
+        NoopPackageInstaller(),
+        task_control,
+        self._state_manager)
+
+    with pytest.raises(TaskError) as e:
+      runner.get_log_position()
+    assert (e.value.message ==
+            "Unable to get the slave's log position: " +
+            "Command 'exit 1' returned non-zero exit status 1")
+
+  def test_stop_interminable(self):
+    cmd = """trap "echo Trapped SIGTERM!" SIGTERM
+while :
+do
+  sleep 60
+done
+"""
+    task_control = FakeTaskControl(mysqld=cmd)
+    runner = MysosTaskRunner(
+      self._self_instance,
+      self._client,
+      "/home/test/my_cluster",
+      NoopPackageInstaller(),
+      task_control,
+      self._state_manager)
+
+    task_control._mysqld = cmd
+    runner.start()
+    assert runner.stop(timeout=1)
+    assert deadline(runner.join, Amount(1, Time.SECONDS)) == -signal.SIGKILL
diff --git a/tests/mysos/scheduler/test_elector.py b/tests/mysos/scheduler/test_elector.py
new file mode 100644
index 0000000..f817314
--- /dev/null
+++ b/tests/mysos/scheduler/test_elector.py
@@ -0,0 +1,135 @@
+import Queue
+import os
+import unittest
+
+from twitter.common.quantity import Amount, Time
+from twitter.mysos.common.testing import Fake
+from twitter.mysos.scheduler.elector import MySQLMasterElector
+
+
+if 'MYSOS_DEBUG' in os.environ:
+  from twitter.common import log
+  from twitter.common.log.options import LogOptions
+  LogOptions.set_stderr_log_level('google:DEBUG')
+  LogOptions.set_simple(True)
+  log.init('mysos_tests')
+
+
+class FakeDriver(Fake): pass
+
+
+class TestElector(unittest.TestCase):
+  def setUp(self):
+    self._driver = FakeDriver()
+    self._epoch = 1
+    self._result = Queue.Queue()
+    self._elector = MySQLMasterElector(
+        self._driver,
+        "cluster0",
+        self._epoch,
+        lambda x: self._result.put(x),
+        Amount(1, Time.SECONDS),
+        Amount(150, Time.MILLISECONDS))
+    self._elector.start()
+
+  def tearDown(self):
+    if self._elector:  # Terminate the elector if it's not used in the test.
+      self._elector.abort()
+      self._elector.join()
+
+  def test_single_slave(self):
+    slave1 = ("task_id1", "slave_id1")
+    self._elector.add_slave(*slave1)
+    self._elector.update_position(self._epoch, slave1[0], 1)
+
+    assert self._result.get(True, 1) == slave1[0]
+
+  def test_two_slaves(self):
+    slave1 = ("task_id1", "slave_id1")
+    slave2 = ("task_id2", "slave_id2")
+    self._elector.add_slave(*slave1)
+    self._elector.add_slave(*slave2)
+
+    self._elector.update_position(self._epoch, slave1[0], 1)
+    self._elector.update_position(self._epoch, slave2[0], 2)
+
+    assert self._result.get(True, 1) == slave2[0]
+
+  def test_two_slaves_complex_position(self):
+    slave1 = ("task_id1", "slave_id1")
+    slave2 = ("task_id2", "slave_id2")
+    self._elector.add_slave(*slave1)
+    self._elector.add_slave(*slave2)
+
+    # The positions are sequences of numeric strings.
+    self._elector.update_position(self._epoch, slave1[0], ["1", "2"])
+    self._elector.update_position(self._epoch, slave2[0], ["2", "1"])
+
+    assert self._result.get(True, 1) == slave2[0]
+
+  def test_delayed_update(self):
+    slave1 = ("task_id1", "slave_id1")
+    slave2 = ("task_id2", "slave_id2")
+    self._elector.add_slave(*slave1)
+    self._elector.add_slave(*slave2)
+    self._elector.update_position(self._epoch, slave2[0], 2)
+
+    # Force an election (after timing out) and test that slave2 is elected because it's the only
+    # slave that responded.
+    self._elector._elect(timedout=True)
+    assert self._result.get(True, 1) == slave2[0]
+
+  def test_position_for_invalid_slave(self):
+    slave1 = ("task_id1", "slave_id1")
+    slave2 = ("task_id2", "slave_id2")
+    self._elector.update_position(self._epoch, slave1[0], 100)  # This update is ignored.
+    self._elector.add_slave(*slave1)
+    self._elector.add_slave(*slave2)
+    self._elector.update_position(self._epoch, slave2[0], 1)
+
+    # Timeout is 1 second. Testing the organic 'timeout' of the thread.
+    assert self._result.get(True, 2) == slave2[0]
+
+  def test_position_for_previous_epoch(self):
+    slave1 = ("task_id1", "slave_id1")
+    slave2 = ("task_id2", "slave_id2")
+    self._elector.add_slave(*slave1)
+    self._elector.add_slave(*slave2)
+
+    self._elector.update_position(self._epoch - 1, slave1[0], 100)  # Update from a previous epoch.
+    self._elector.update_position(self._epoch, slave2[0], 1)
+
+    # Induce an election after it timed out.
+    self._elector._elect(timedout=True)
+    assert self._result.get(True, 1) == slave2[0]
+
+  def test_remove_slave_after_election(self):
+    slave1 = ("task_id1", "slave_id1")
+    slave2 = ("task_id2", "slave_id2")
+    self._elector.add_slave(*slave1)
+    self._elector.add_slave(*slave2)
+
+    self._elector.update_position(self._epoch, slave1[0], 1)
+    self._elector.update_position(self._epoch, slave2[0], 2)
+
+    assert self._result.get(True, 1) == slave2[0]
+
+    # At this point a master is already elected. Slave removal is ignored.
+    self._elector.remove_slave(slave2[0])
+
+    assert len(self._elector._positions) == 2
+
+  def test_remove_slave_during_election(self):
+    slave1 = ("task_id1", "slave_id1")
+    slave2 = ("task_id2", "slave_id2")
+    self._elector.add_slave(*slave1)
+    self._elector.add_slave(*slave2)
+
+    self._elector.update_position(self._epoch, slave2[0], 2)
+
+    # Election still ongoing. Removing slave2 allows slave1 to be elected.
+    self._elector.remove_slave(slave2[0])
+    self._elector.update_position(self._epoch, slave1[0], 1)
+
+    self._elector._elect()
+    assert self._result.get(True, 1) == slave1[0]
diff --git a/tests/mysos/scheduler/test_http.py b/tests/mysos/scheduler/test_http.py
new file mode 100644
index 0000000..55eae33
--- /dev/null
+++ b/tests/mysos/scheduler/test_http.py
@@ -0,0 +1,73 @@
+import json
+import shutil
+import tempfile
+import unittest
+
+from twitter.mysos.common import pkgutil
+from twitter.mysos.scheduler.http import MysosServer
+from twitter.mysos.scheduler.scheduler import MysosScheduler
+
+import pytest
+from webtest import AppError, TestApp
+
+
+MYSOS_MODULE = 'twitter.mysos.scheduler'
+ASSET_RELPATH = 'assets'
+
+
+class FakeScheduler(object):
+  def __init__(self):
+    self._exception = None
+    self._response = None
+
+  def set_exception(self, exception):
+    self._exception = exception
+
+  def set_response(self, response):
+    self._response = response
+
+  def create_cluster(self, cluster_name, cluster_user, num_nodes, backup_id=None):
+    if self._exception:
+      raise self._exception
+    return self._response
+
+
+class TestHTTP(unittest.TestCase):
+  @classmethod
+  def setUpClass(cls):
+    cls.web_assets_dir = tempfile.mkdtemp()
+    pkgutil.unpack_assets(cls.web_assets_dir, MYSOS_MODULE, ASSET_RELPATH)
+
+  @classmethod
+  def tearDownClass(cls):
+    shutil.rmtree(cls.web_assets_dir)
+
+  def setUp(self):
+    self._scheduler = FakeScheduler()
+    self._app = TestApp(MysosServer(self._scheduler, self.web_assets_dir).app)
+
+  def test_create_cluster_successful(self):
+    response = ('test_cluster_url', 'passwordfortestcluster')
+    self._scheduler.set_response(response)
+    body = self._app.post(
+        '/clusters/test_cluster', {'num_nodes': 3, 'cluster_user': 'mysos'}).normal_body
+    assert json.loads(body) == dict(cluster_url=response[0], cluster_password=response[1])
+
+  def test_create_cluster_exists(self):
+    self._scheduler.set_exception(MysosScheduler.ClusterExists())
+
+    with pytest.raises(AppError) as e:
+      assert self._app.post('/clusters/test_cluster', {'num_nodes': 3, 'cluster_user': 'mysos'})
+    assert e.value.message.startswith('Bad response: 409')
+
+  def test_create_cluster_value_error(self):
+    self._scheduler.set_exception(ValueError())
+    with pytest.raises(AppError) as e:
+      self._app.post('/clusters/test_cluster', {'num_nodes': 3, 'cluster_user': 'mysos'})
+    assert e.value.message.startswith('Bad response: 400')
+
+  def test_create_cluster_invalid_user(self):
+    self._scheduler.set_exception(MysosScheduler.InvalidUser())
+    with pytest.raises(AppError) as e:
+      self._app.post('/clusters/test_cluster', {'num_nodes': 3, 'cluster_user': 'mysos'})
+    assert e.value.message.startswith('Bad response: 400')
diff --git a/tests/mysos/scheduler/test_launcher.py b/tests/mysos/scheduler/test_launcher.py
new file mode 100644
index 0000000..325038a
--- /dev/null
+++ b/tests/mysos/scheduler/test_launcher.py
@@ -0,0 +1,549 @@
+import json
+import os
+import shutil
+import tempfile
+import threading
+
+from twitter.common import log
+from twitter.common.concurrent import deadline
+from twitter.common.quantity import Amount, Time
+from twitter.mysos.common.cluster import get_cluster_path, wait_for_master
+from twitter.mysos.common.testing import Fake
+from twitter.mysos.scheduler.launcher import create_resources, MySQLClusterLauncher
+from twitter.mysos.scheduler.state import LocalStateProvider, MySQLCluster
+from twitter.mysos.scheduler.zk_state import ZooKeeperStateProvider
+
+from kazoo.handlers.threading import SequentialThreadingHandler
+import mesos.interface.mesos_pb2 as mesos_pb2
+from zake.fake_client import FakeClient
+from zake.fake_storage import FakeStorage
+
+import pytest
+
+
+if 'MYSOS_DEBUG' in os.environ:
+  from twitter.common.log.options import LogOptions
+  LogOptions.set_stderr_log_level('google:DEBUG')
+  LogOptions.set_simple(True)
+  log.init('mysos_tests')
+
+
+class FakeDriver(Fake): pass
+
+
+class TestLauncher(object):
+  @pytest.fixture(params=[LocalStateProvider, ZooKeeperStateProvider], autouse=True)
+  def setup(self, request):
+    self._driver = FakeDriver()
+    self._storage = FakeStorage(SequentialThreadingHandler())
+    self._zk_client = FakeClient(storage=self._storage)
+    self._zk_client.start()
+
+    self._offer = mesos_pb2.Offer()
+    self._offer.id.value = "offer_id_0"
+    self._offer.framework_id.value = "framework_id_0"
+    self._offer.slave_id.value = "slave_id_0"
+    self._offer.hostname = "localhost"
+
+    # Enough memory and ports to fit three tasks.
+    resources = create_resources(cpus=4, mem=512 * 3, ports=set([10000, 10001, 10002]))
+    self._offer.resources.extend(resources)
+
+    self._framework_user = "framework_user"
+
+    # Some tests use the default launcher; some don't.
+    self._zk_url = "zk://host/mysos/test"
+    self._cluster = MySQLCluster("cluster0", "user", "pass", 3)
+
+    # Construct the state provider based on the test parameter.
+    if request.param == LocalStateProvider:
+      tmpdir = tempfile.mkdtemp()
+      self._state_provider = LocalStateProvider(tmpdir)
+      request.addfinalizer(lambda: shutil.rmtree(tmpdir, True))  # Clean up after ourselves.
+    elif request.param == ZooKeeperStateProvider:
+      self._state_provider = ZooKeeperStateProvider(self._zk_client, "/mysos/test")
+
+    self._launcher = MySQLClusterLauncher(
+        self._driver,
+        self._cluster,
+        self._state_provider,
+        self._zk_url,
+        self._zk_client,
+        self._framework_user,
+        "./executor.pex",
+        "cmd.sh",
+        Amount(5, Time.SECONDS),
+        "/etc/mysos/admin_keyfile.yml",
+        query_interval=Amount(150, Time.MILLISECONDS))  # Short interval.
+
+    self._elected = threading.Event()
+    self._launchers = [self._launcher]  # See teardown().
+
+    request.addfinalizer(self.teardown)
+
+  def teardown(self):
+    for launcher in self._launchers:
+      if launcher._elector:
+        launcher._elector.abort()  # Abort the thread even if the election is pending.
+        launcher._elector.join()
+
+  def test_launch_cluster_all_nodes_successful(self):
+    for i in range(self._cluster.num_nodes):
+      task_id, remaining = self._launcher.launch(self._offer)
+      del self._offer.resources[:]
+      self._offer.resources.extend(remaining)
+      assert task_id == "mysos-cluster0-%s" % i
+
+    tasks = self._driver.method_calls["launchTasks"]
+    assert len(tasks) == self._cluster.num_nodes
+
+    # No new tasks are launched.
+    assert self._launcher.launch(self._offer)[0] is None
+    assert len(self._driver.method_calls["launchTasks"]) == self._cluster.num_nodes
+
+    # All 3 nodes have successfully started.
+    status = mesos_pb2.TaskStatus()
+    status.state = mesos_pb2.TASK_RUNNING  # Valid state.
+    status.slave_id.value = self._offer.slave_id.value
+    for i in range(self._cluster.num_nodes):
+      status.task_id.value = "mysos-cluster0-%s" % i
+      self._launcher.status_update(status)
+
+    deadline(
+        lambda: wait_for_master(
+            get_cluster_path(self._zk_url, self._cluster.name),
+            self._zk_client),
+        Amount(5, Time.SECONDS))
+
+    # The first slave is elected.
+    assert "/mysos/test/cluster0/master/member_0000000000" in self._storage.paths
+    # Two slaves.
+    assert len([x for x in self._storage.paths.keys() if x.startswith(
+        "/mysos/test/cluster0/slaves/member_")]) == 2
+
+  def test_launch_cluster_insufficient_resources(self):
+    """All but one slave in the slave are launched successfully."""
+    del self._offer.resources[:]
+    resources = create_resources(cpus=4, mem=512 * 3, ports=set([10000, 10001]))
+    self._offer.resources.extend(resources)
+
+    # There is one fewer port than required to launch the entire cluster.
+    for i in range(self._cluster.num_nodes - 1):
+      task_id, remaining = self._launcher.launch(self._offer)
+      del self._offer.resources[:]
+      self._offer.resources.extend(remaining)
+      assert task_id == "mysos-cluster0-%s" % i
+
+    tasks = self._driver.method_calls["launchTasks"]
+    assert len(tasks) == self._cluster.num_nodes - 1
+
+    # The final task cannot get launched.
+    assert self._launcher.launch(self._offer)[0] is None
+    assert len(self._driver.method_calls["launchTasks"]) == self._cluster.num_nodes - 1
+
+    # The two nodes have successfully started.
+    status = mesos_pb2.TaskStatus()
+    status.state = mesos_pb2.TASK_RUNNING  # Valid state.
+    status.slave_id.value = self._offer.slave_id.value
+    for i in range(self._cluster.num_nodes - 1):
+      status.task_id.value = "mysos-cluster0-%s" % i
+      self._launcher.status_update(status)
+
+    deadline(
+        lambda: wait_for_master(
+            get_cluster_path(self._zk_url, self._cluster.name),
+            self._zk_client),
+        Amount(5, Time.SECONDS))
+
+    # The first slave is elected.
+    assert "/mysos/test/cluster0/master/member_0000000000" in self._storage.paths
+    # One slave.
+    assert len([x for x in self._storage.paths.keys() if x.startswith(
+      "/mysos/test/cluster0/slaves/member_")]) == 1
+
+  def test_two_launchers(self):
+    """Two launchers share resources and launch their clusters successfully."""
+    launchers = [
+      MySQLClusterLauncher(
+          self._driver,
+          MySQLCluster("cluster0", "user0", "pass0", 1),
+          self._state_provider,
+          self._zk_url,
+          self._zk_client,
+          self._framework_user,
+          "./executor.pex",
+          "cmd.sh",
+          Amount(5, Time.SECONDS),
+          "/etc/mysos/admin_keyfile.yml"),
+      MySQLClusterLauncher(
+          self._driver,
+          MySQLCluster("cluster1", "user1", "pass1", 2),
+          self._state_provider,
+          self._zk_url,
+          self._zk_client,
+          self._framework_user,
+          "./executor.pex",
+          "cmd.sh",
+          Amount(5, Time.SECONDS),
+          "/etc/mysos/admin_keyfile.yml")]
+    self._launchers.extend(launchers)
+
+    resources = create_resources(cpus=4, mem=512 * 3, ports=set([10000, 10001, 10002]))
+    self._offer.resources.extend(resources)
+
+    # Three nodes in total across two clusters.
+    # Simulate the scheduler.
+    for i in range(3):
+      for launcher in launchers:
+        task_id, remaining = launcher.launch(self._offer)
+        if task_id:
+          # Update the offer so other launchers will use its remaining resources.
+          del self._offer.resources[:]
+          self._offer.resources.extend(remaining)
+          break
+
+    tasks = self._driver.method_calls["launchTasks"]
+    assert len(tasks) == 3
+
+  def test_invalid_status_update(self):
+    """Launcher raises an exception when an invalid status is received."""
+    self._cluster.num_nodes = 1
+    launcher = MySQLClusterLauncher(
+        self._driver,
+        self._cluster,
+        self._state_provider,
+        self._zk_url,
+        self._zk_client,
+        self._framework_user,
+        "./executor.pex",
+        "cmd.sh",
+        Amount(5, Time.SECONDS),
+        "/etc/mysos/admin_keyfile.yml")
+    self._launchers.append(launcher)
+
+    resources = create_resources(cpus=4, mem=512 * 3, ports=set([10000]))
+    self._offer.resources.extend(resources)
+
+    task_id, _ = launcher.launch(self._offer)
+    assert task_id == "mysos-cluster0-0"
+
+    tasks = self._driver.method_calls["launchTasks"]
+    assert len(tasks) == self._cluster.num_nodes
+
+    status = mesos_pb2.TaskStatus()
+    status.task_id.value = task_id
+    status.state = mesos_pb2.TASK_RUNNING  # Valid state.
+    launcher.status_update(status)
+
+    status.state = mesos_pb2.TASK_FINISHED  # An invalid state.
+
+    with pytest.raises(MySQLClusterLauncher.Error):
+      launcher.status_update(status)
+
+  def test_terminal_status_update(self):
+    """Launcher reacts to terminated task by launching a new one."""
+    self._cluster.num_nodes = 1
+    launcher = MySQLClusterLauncher(
+        self._driver,
+        self._cluster,
+        self._state_provider,
+        self._zk_url,
+        self._zk_client,
+        self._framework_user,
+        "./executor.pex",
+        "cmd.sh",
+        Amount(1, Time.SECONDS),
+        "/etc/mysos/admin_keyfile.yml")
+    self._launchers.append(launcher)
+
+    resources = create_resources(cpus=4, mem=512 * 3, ports=set([10000]))
+    self._offer.resources.extend(resources)
+
+    task_id, _ = launcher.launch(self._offer)
+    assert task_id == "mysos-cluster0-0"
+
+    launched = self._driver.method_calls["launchTasks"]
+    assert len(launched) == self._cluster.num_nodes
+
+    status = mesos_pb2.TaskStatus()
+    status.task_id.value = task_id
+    status.state = mesos_pb2.TASK_RUNNING
+    launcher.status_update(status)
+
+    assert len(launcher._cluster.running_tasks) == 1
+
+    status.state = mesos_pb2.TASK_LOST
+    launcher.status_update(status)
+
+    assert len(launcher._cluster.running_tasks) == 0
+
+    task_id, _ = launcher.launch(self._offer)
+    assert task_id == "mysos-cluster0-1"
+
+    launched = self._driver.method_calls["launchTasks"]
+
+    # One task is relaunched to make up for the lost one.
+    assert len(launched) == self._cluster.num_nodes + 1
+
+  def test_master_failover(self):
+    for i in range(self._cluster.num_nodes):
+      task_id, remaining = self._launcher.launch(self._offer)
+      del self._offer.resources[:]
+      self._offer.resources.extend(remaining)
+      assert task_id == "mysos-cluster0-%s" % i
+
+    tasks = self._driver.method_calls["launchTasks"]
+    assert len(tasks) == self._cluster.num_nodes
+
+    # All 3 nodes have successfully started.
+    status = mesos_pb2.TaskStatus()
+    status.state = mesos_pb2.TASK_RUNNING
+    status.slave_id.value = self._offer.slave_id.value
+
+    for i in range(self._cluster.num_nodes):
+      status.task_id.value = "mysos-cluster0-%s" % i
+      self._launcher.status_update(status)
+
+    # No log positions queries are sent for the first epoch.
+    assert "sendFrameworkMessage" not in self._driver.method_calls
+
+    # Wait for the election to complete.
+    deadline(
+        lambda: wait_for_master(
+            get_cluster_path(self._zk_url, self._cluster.name),
+            self._zk_client),
+        Amount(5, Time.SECONDS))
+
+    # The first slave is elected.
+    assert "/mysos/test/cluster0/master/member_0000000000" in self._storage.paths
+
+    # Now fail the master task.
+    status.task_id.value = "mysos-cluster0-0"
+    status.state = mesos_pb2.TASK_FAILED
+    self._launcher.status_update(status)
+
+    assert len(self._launcher._cluster.running_tasks) == 2
+
+    # Log positions queries are sent.
+    self._launcher._elector._elect()
+    assert len(self._driver.method_calls["sendFrameworkMessage"]) >= 2
+
+    for i in range(1, self._cluster.num_nodes):
+      self._launcher.framework_message(
+          "mysos-cluster0-%s" % i,
+          self._offer.slave_id.value,
+          json.dumps(dict(epoch=1, position=str(i))))
+
+    # Wait for the election to complete.
+    deadline(
+        lambda: wait_for_master(
+            get_cluster_path(self._zk_url, self._cluster.name),
+            self._zk_client),
+        Amount(5, Time.SECONDS))
+
+    # The slave with the highest position is elected.
+    assert "/mysos/test/cluster0/master/member_0000000002" in self._storage.paths
+
+    assert len(self._launcher._cluster.running_tasks) == 2
+
+    # When a new offer comes in, a new task is launched.
+    del self._offer.resources[:]
+    resources = create_resources(cpus=1, mem=512, ports=set([10000]))
+    self._offer.resources.extend(resources)
+    task_id, _ = self._launcher.launch(self._offer)
+    assert task_id == "mysos-cluster0-3"
+
+    launched = self._driver.method_calls["launchTasks"]
+    # One task is relaunched to make up for the failed one.
+    assert len(launched) == self._cluster.num_nodes + 1
+
+  def test_launcher_recovery_after_election_completed(self):
+    # 1. Launch a cluster on the running launcher.
+    for i in range(self._cluster.num_nodes):
+      task_id, remaining = self._launcher.launch(self._offer)
+      del self._offer.resources[:]
+      self._offer.resources.extend(remaining)
+      assert task_id == "mysos-cluster0-%s" % i
+
+    tasks = self._driver.method_calls["launchTasks"]
+    assert len(tasks) == self._cluster.num_nodes
+
+    # No new tasks are launched.
+    assert self._launcher.launch(self._offer)[0] is None
+    assert len(self._driver.method_calls["launchTasks"]) == self._cluster.num_nodes
+
+    # All 3 nodes have successfully started.
+    status = mesos_pb2.TaskStatus()
+    status.state = mesos_pb2.TASK_RUNNING
+    status.slave_id.value = self._offer.slave_id.value
+    for i in range(self._cluster.num_nodes):
+      status.task_id.value = "mysos-cluster0-%s" % i
+      self._launcher.status_update(status)
+
+    deadline(
+        lambda: wait_for_master(
+            get_cluster_path(self._zk_url, self._cluster.name),
+            self._zk_client),
+        Amount(5, Time.SECONDS))
+
+    # The first slave is elected.
+    assert "/mysos/test/cluster0/master/member_0000000000" in self._storage.paths
+    # Two slaves.
+    assert len([x for x in self._storage.paths.keys() if x.startswith(
+        "/mysos/test/cluster0/slaves/member_")]) == 2
+
+    # 2. Recover the launcher.
+    self._cluster = self._state_provider.load_cluster_state(self._cluster.name)
+    self._launcher = MySQLClusterLauncher(
+        self._driver,
+        self._cluster,
+        self._state_provider,
+        self._zk_url,
+        self._zk_client,
+        self._framework_user,
+        "./executor.pex",
+        "cmd.sh",
+        Amount(5, Time.SECONDS),
+        "/etc/mysos/admin_keyfile.yml",
+        query_interval=Amount(150, Time.MILLISECONDS))
+
+    # Now fail the master task.
+    status.task_id.value = "mysos-cluster0-0"
+    status.state = mesos_pb2.TASK_FAILED
+    self._launcher.status_update(status)
+
+    for i in range(1, self._cluster.num_nodes):
+      self._launcher.framework_message(
+          "mysos-cluster0-%s" % i,
+          self._offer.slave_id.value,
+          json.dumps(dict(epoch=1, position=str(i))))
+
+    deadline(
+        lambda: wait_for_master(
+            get_cluster_path(self._zk_url, self._cluster.name),
+            self._zk_client),
+        Amount(5, Time.SECONDS))
+
+    # The second slave has the larger position and is elected.
+    assert "/mysos/test/cluster0/master/member_0000000002" in self._storage.paths
+
+  def test_launcher_recovery_before_election_completed(self):
+    # 1. Launch a cluster on the running launcher.
+    for i in range(self._cluster.num_nodes):
+      task_id, remaining = self._launcher.launch(self._offer)
+      del self._offer.resources[:]
+      self._offer.resources.extend(remaining)
+      assert task_id == "mysos-cluster0-%s" % i
+
+    tasks = self._driver.method_calls["launchTasks"]
+    assert len(tasks) == self._cluster.num_nodes
+
+    # No new tasks are launched.
+    assert self._launcher.launch(self._offer)[0] is None
+    assert len(self._driver.method_calls["launchTasks"]) == self._cluster.num_nodes
+
+    # All 3 nodes have successfully started.
+    status = mesos_pb2.TaskStatus()
+    status.state = mesos_pb2.TASK_RUNNING
+    status.slave_id.value = self._offer.slave_id.value
+    for i in range(self._cluster.num_nodes):
+      status.task_id.value = "mysos-cluster0-%s" % i
+      self._launcher.status_update(status)
+
+    deadline(
+        lambda: wait_for_master(
+            get_cluster_path(self._zk_url, self._cluster.name),
+            self._zk_client),
+        Amount(5, Time.SECONDS))
+
+    # The first slave is elected.
+    assert "/mysos/test/cluster0/master/member_0000000000" in self._storage.paths
+    # Two slaves.
+    assert len([x for x in self._storage.paths.keys() if x.startswith(
+        "/mysos/test/cluster0/slaves/member_")]) == 2
+
+    # Now fail the master task which leads to re-election.
+    status.task_id.value = "mysos-cluster0-0"
+    status.state = mesos_pb2.TASK_FAILED
+    self._launcher.status_update(status)
+
+    # 2. Recover the launcher.
+    self._cluster = self._state_provider.load_cluster_state(self._cluster.name)
+    self._launcher = MySQLClusterLauncher(
+        self._driver,
+        self._cluster,
+        self._state_provider,
+        self._zk_url,
+        self._zk_client,
+        self._framework_user,
+        "./executor.pex",
+        "cmd.sh",
+        Amount(5, Time.SECONDS),
+        "/etc/mysos/admin_keyfile.yml",
+        query_interval=Amount(150, Time.MILLISECONDS))
+
+    for i in range(1, self._cluster.num_nodes):
+      self._launcher.framework_message(
+          "mysos-cluster0-%s" % i,
+          self._offer.slave_id.value,
+          json.dumps(dict(epoch=2, position=str(i))))
+
+    deadline(
+        lambda: wait_for_master(
+            get_cluster_path(self._zk_url, self._cluster.name),
+            self._zk_client),
+        Amount(5, Time.SECONDS))
+
+    # The second slave has the larger position and is elected.
+    assert "/mysos/test/cluster0/master/member_0000000002" in self._storage.paths
+
+  def test_launcher_kill(self):
+    for i in range(self._cluster.num_nodes):
+      task_id, remaining = self._launcher.launch(self._offer)
+      del self._offer.resources[:]
+      self._offer.resources.extend(remaining)
+      assert task_id == "mysos-cluster0-%s" % i
+
+    tasks = self._driver.method_calls["launchTasks"]
+    assert len(tasks) == self._cluster.num_nodes
+
+    # No new tasks are launched.
+    assert self._launcher.launch(self._offer)[0] is None
+    assert len(self._driver.method_calls["launchTasks"]) == self._cluster.num_nodes
+
+    # All 3 nodes have successfully started.
+    status = mesos_pb2.TaskStatus()
+    status.state = mesos_pb2.TASK_RUNNING  # Valid state.
+    status.slave_id.value = self._offer.slave_id.value
+    for i in range(self._cluster.num_nodes):
+      status.task_id.value = "mysos-cluster0-%s" % i
+      self._launcher.status_update(status)
+
+    deadline(
+        lambda: wait_for_master(
+            get_cluster_path(self._zk_url, self._cluster.name),
+            self._zk_client),
+        Amount(5, Time.SECONDS))
+
+    # The first slave is elected.
+    assert "/mysos/test/cluster0/master/member_0000000000" in self._storage.paths
+    # Two slaves.
+    assert len([x for x in self._storage.paths.keys() if x.startswith(
+        "/mysos/test/cluster0/slaves/member_")]) == 2
+
+    # Kill the cluster.
+    with pytest.raises(MySQLClusterLauncher.PermissionError):
+      self._launcher.kill("wrong_password")
+
+    self._launcher.kill(self._cluster.password)  # Correct password.
+
+    # All 3 nodes are successfully killed.
+    status = mesos_pb2.TaskStatus()
+    status.state = mesos_pb2.TASK_KILLED
+    status.slave_id.value = self._offer.slave_id.value
+    for i in range(self._cluster.num_nodes):
+      status.task_id.value = "mysos-cluster0-%s" % i
+      self._launcher.status_update(status)
+
+    assert "/mysos/test/cluster0" not in self._storage.paths  # ServerSets removed.
+    assert not self._state_provider.load_cluster_state("cluster0")  # State removed.
diff --git a/tests/mysos/scheduler/test_mysos_scheduler.py b/tests/mysos/scheduler/test_mysos_scheduler.py
new file mode 100644
index 0000000..464b6dd
--- /dev/null
+++ b/tests/mysos/scheduler/test_mysos_scheduler.py
@@ -0,0 +1,86 @@
+import getpass
+import os
+import posixpath
+import subprocess
+
+from twitter.common import log
+from twitter.common.concurrent import deadline
+from twitter.common.dirutil import safe_mkdtemp
+from twitter.common.quantity import Amount, Time
+from twitter.mysos.common.cluster import get_cluster_path, wait_for_master
+from twitter.mysos.scheduler.scheduler import MysosScheduler
+from twitter.mysos.scheduler.state import LocalStateProvider, Scheduler
+
+from kazoo.handlers.threading import SequentialThreadingHandler
+import mesos.interface
+from mesos.interface.mesos_pb2 import DRIVER_STOPPED, FrameworkInfo
+import mesos.native
+from zake.fake_client import FakeClient
+from zake.fake_storage import FakeStorage
+
+
+if 'MYSOS_DEBUG' in os.environ:
+  from twitter.common.log.options import LogOptions
+  LogOptions.set_stderr_log_level('google:DEBUG')
+  LogOptions.set_simple(True)
+  log.init('mysos_tests')
+
+
+def test_scheduler_runs():
+  """
+    Verifies that the scheduler successfully launches 3 "no-op" MySQL tasks.
+    NOTE: Due to the limitation of zake the scheduler's ZK operations are not propagated to
+    executors in separate processes but they are unit-tested separately.
+  """
+
+  # Make sure fake_mysos_executor.pex is available to be fetched by Mesos slave.
+  # TODO(xujyan): Fix this as we don't use pex here anymore.
+  assert os.path.isfile('dist/fake_mysos_executor.pex')
+
+  storage = FakeStorage(SequentialThreadingHandler())
+  zk_client = FakeClient(storage=storage)
+  zk_client.start()
+
+  zk_url = "zk://fake_host/home/mysos/clusters"
+  cluster_name = "test_cluster"
+  num_nodes = 3
+
+  state_provider = LocalStateProvider(safe_mkdtemp())
+
+  framework_info = FrameworkInfo(
+      user=getpass.getuser(),
+      name="mysos",
+      checkpoint=False)
+
+  state = Scheduler(framework_info)
+
+  scheduler = MysosScheduler(
+      state,
+      state_provider,
+      getpass.getuser(),
+      os.path.abspath("dist/fake_mysos_executor.pex"),
+      "./fake_mysos_executor.pex",
+      zk_client,
+      zk_url,
+      Amount(40, Time.SECONDS),
+      "/fakepath")
+
+  scheduler_driver = mesos.native.MesosSchedulerDriver(
+      scheduler,
+      framework_info,
+      "local")
+  scheduler_driver.start()
+
+  # Wait until the scheduler is connected and becomes available.
+  assert scheduler.connected.wait(30)
+
+  scheduler.create_cluster(cluster_name, "mysql_user", num_nodes)
+
+  # A slave is promoted to be the master.
+  deadline(
+      lambda: wait_for_master(
+          get_cluster_path(posixpath.join(zk_url, 'discover'), cluster_name),
+          zk_client),
+      Amount(40, Time.SECONDS))
+
+  assert scheduler_driver.stop() == DRIVER_STOPPED
diff --git a/tests/mysos/scheduler/test_scheduler.py b/tests/mysos/scheduler/test_scheduler.py
new file mode 100644
index 0000000..2ed313c
--- /dev/null
+++ b/tests/mysos/scheduler/test_scheduler.py
@@ -0,0 +1,182 @@
+import getpass
+import os
+import shutil
+import tempfile
+import unittest
+
+from twitter.common import log
+from twitter.common.quantity import Amount, Time
+from twitter.mysos.common.testing import Fake
+from twitter.mysos.scheduler.scheduler import (
+    INCOMPATIBLE_ROLE_OFFER_REFUSE_DURATION,
+    MysosScheduler)
+from twitter.mysos.scheduler.launcher import create_resources
+from twitter.mysos.scheduler.state import LocalStateProvider, MySQLCluster, Scheduler
+
+from kazoo.handlers.threading import SequentialThreadingHandler
+import mesos.interface.mesos_pb2 as mesos_pb2
+from zake.fake_client import FakeClient
+from zake.fake_storage import FakeStorage
+
+import pytest
+
+
+if 'MYSOS_DEBUG' in os.environ:
+  from twitter.common.log.options import LogOptions
+  LogOptions.set_stderr_log_level('google:DEBUG')
+  LogOptions.set_simple(True)
+  log.init('mysos_tests')
+
+
+class FakeDriver(Fake): pass
+
+
+class TestScheduler(unittest.TestCase):
+  def setUp(self):
+    self._driver = FakeDriver()
+    self._storage = FakeStorage(SequentialThreadingHandler())
+    self._zk_client = FakeClient(storage=self._storage)
+    self._zk_client.start()
+
+    self._framework_id = mesos_pb2.FrameworkID()
+    self._framework_id.value = "framework_id_0"
+
+    self._offer = mesos_pb2.Offer()
+    self._offer.id.value = "offer_id_0"
+    self._offer.framework_id.value = self._framework_id.value
+    self._offer.slave_id.value = "slave_id_0"
+    self._offer.hostname = "localhost"
+
+    resources = create_resources(cpus=4, mem=512 * 3, ports=set([10000, 10001, 10002]))
+    self._offer.resources.extend(resources)
+
+    self._framework_user = "framework_user"
+
+    self._zk_url = "zk://host/mysos/test"
+    self._cluster = MySQLCluster("cluster0", "user", "pass", 3)
+
+    self._tmpdir = tempfile.mkdtemp()
+    self._state_provider = LocalStateProvider(self._tmpdir)
+
+    framework_info = mesos_pb2.FrameworkInfo(
+        user=getpass.getuser(),
+        name="mysos",
+        checkpoint=False)
+    self._state = Scheduler(framework_info)
+
+  def tearDown(self):
+    shutil.rmtree(self._tmpdir, True)  # Clean up after ourselves.
+
+  def test_scheduler_recovery(self):
+    scheduler1 = MysosScheduler(
+        self._state,
+        self._state_provider,
+        self._framework_user,
+        "./executor.pex",
+        "cmd.sh",
+        self._zk_client,
+        self._zk_url,
+        Amount(5, Time.SECONDS),
+        "/etc/mysos/admin_keyfile.yml")
+    scheduler1.registered(self._driver, self._framework_id, object())
+    scheduler1.create_cluster("cluster1", "mysql_user", 3)
+    scheduler1.resourceOffers(self._driver, [self._offer])
+
+    # One task is launched for one offer.
+    assert len(scheduler1._launchers["cluster1"]._cluster.tasks) == 1
+
+    with pytest.raises(MysosScheduler.ClusterExists):
+      scheduler1.create_cluster("cluster1", "mysql_user", 3)
+
+    # FrameworkID should have been persisted.
+    self._state = self._state_provider.load_scheduler_state()
+    assert self._state.framework_info.id.value == self._framework_id.value
+
+    # Simulate restart.
+    scheduler2 = MysosScheduler(
+        self._state,
+        self._state_provider,
+        self._framework_user,
+        "./executor.pex",
+        "cmd.sh",
+        self._zk_client,
+        self._zk_url,
+        Amount(5, Time.SECONDS),
+        "/etc/mysos/admin_keyfile.yml")
+
+    # Scheduler always receives registered() with the same FrameworkID after failover.
+    scheduler2.registered(self._driver, self._framework_id, object())
+
+    assert len(scheduler2._launchers) == 1
+    assert scheduler2._launchers["cluster1"].cluster_name == "cluster1"
+
+    # Scheduler has recovered the cluster so it doesn't accept another of the same name.
+    with pytest.raises(MysosScheduler.ClusterExists):
+      scheduler2.create_cluster("cluster1", "mysql_user", 3)
+
+  def test_scheduler_recovery_failure_before_launch(self):
+    scheduler1 = MysosScheduler(
+        self._state,
+        self._state_provider,
+        self._framework_user,
+        "./executor.pex",
+        "cmd.sh",
+        self._zk_client,
+        self._zk_url,
+        Amount(5, Time.SECONDS),
+        "/etc/mysos/admin_keyfile.yml")
+    scheduler1.registered(self._driver, self._framework_id, object())
+    scheduler1.create_cluster("cluster1", "mysql_user", 3)
+
+    # Simulate restart before the task is successfully launched.
+    scheduler2 = MysosScheduler(
+        self._state,
+        self._state_provider,
+        self._framework_user,
+        "./executor.pex",
+        "cmd.sh",
+        self._zk_client,
+        self._zk_url,
+        Amount(5, Time.SECONDS),
+        "/etc/mysos/admin_keyfile.yml")
+
+    assert len(scheduler2._launchers) == 0  # No launchers are recovered.
+
+    # Scheduler always receives registered() with the same FrameworkID after failover.
+    scheduler2.registered(self._driver, self._framework_id, object())
+
+    assert len(scheduler2._launchers) == 1
+    assert scheduler2._launchers["cluster1"].cluster_name == "cluster1"
+
+    # Now offer the resources for this task.
+    scheduler2.resourceOffers(self._driver, [self._offer])
+
+    # One task is launched for the offer.
+    assert len(scheduler2._launchers["cluster1"]._cluster.active_tasks) == 1
+
+    # Scheduler has recovered the cluster so it doesn't accept another of the same name.
+    with pytest.raises(MysosScheduler.ClusterExists):
+      scheduler2.create_cluster("cluster1", "mysql_user", 3)
+
+  def test_incompatible_resource_role(self):
+    scheduler1 = MysosScheduler(
+        self._state,
+        self._state_provider,
+        self._framework_user,
+        "./executor.pex",
+        "cmd.sh",
+        self._zk_client,
+        self._zk_url,
+        Amount(5, Time.SECONDS),
+        "/etc/mysos/admin_keyfile.yml",
+        framework_role='mysos')  # Require 'mysos' but the resources are in '*'.
+    scheduler1.registered(self._driver, self._framework_id, object())
+    scheduler1.create_cluster("cluster1", "mysql_user", 3)
+    scheduler1.resourceOffers(self._driver, [self._offer])
+
+    assert "declineOffer" in self._driver.method_calls
+    assert len(self._driver.method_calls["declineOffer"]) == 1
+    # [0][0][1]: [First declineOffer call][The positional args][The first positional arg], which is
+    # a 'Filters' object.
+    assert (self._driver.method_calls["declineOffer"][0][0][1].refuse_seconds ==
+        INCOMPATIBLE_ROLE_OFFER_REFUSE_DURATION.as_(Time.SECONDS))
diff --git a/tests/mysos/scheduler/test_state.py b/tests/mysos/scheduler/test_state.py
new file mode 100644
index 0000000..69b783e
--- /dev/null
+++ b/tests/mysos/scheduler/test_state.py
@@ -0,0 +1,59 @@
+import os
+import shutil
+import tempfile
+import unittest
+
+from twitter.mysos.scheduler.state import (
+    LocalStateProvider,
+    MySQLCluster,
+    MySQLTask,
+    Scheduler
+)
+
+from mesos.interface.mesos_pb2 import FrameworkInfo
+
+
+if 'MYSOS_DEBUG' in os.environ:
+  from twitter.common import log
+  from twitter.common.log.options import LogOptions
+  LogOptions.set_stderr_log_level('google:DEBUG')
+  LogOptions.set_simple(True)
+  log.init('mysos_tests')
+
+
+class TestState(unittest.TestCase):
+  def setUp(self):
+    self._tmpdir = tempfile.mkdtemp()
+    self._state_provider = LocalStateProvider(self._tmpdir)
+
+  def tearDown(self):
+    shutil.rmtree(self._tmpdir, True)
+
+  def test_scheduler_state(self):
+    expected = Scheduler(FrameworkInfo(
+        user='test_user',
+        name='test_fw_name',
+        checkpoint=True))
+    expected.clusters.add('cluster2')
+    expected.clusters.add('cluster1')
+
+    self._state_provider.dump_scheduler_state(expected)
+    actual = self._state_provider.load_scheduler_state()
+
+    assert expected.framework_info == actual.framework_info
+    assert expected.clusters == actual.clusters
+
+  def test_cluster_state(self):
+    expected = MySQLCluster('cluster1', 'cluster_user', 'cluster_password', 3)
+
+    expected.tasks['task1'] = MySQLTask(
+        'cluster1', 'task1', 'slave1', 'host1', 10000)
+
+    self._state_provider.dump_cluster_state(expected)
+    actual = self._state_provider.load_cluster_state('cluster1')
+
+    assert expected.user == actual.user
+    assert isinstance(actual.num_nodes, int)
+    assert expected.num_nodes == actual.num_nodes
+    assert len(expected.tasks) == len(actual.tasks)
+    assert expected.tasks['task1'].port == actual.tasks['task1'].port
diff --git a/tests/mysos/scheduler/test_zk_state.py b/tests/mysos/scheduler/test_zk_state.py
new file mode 100644
index 0000000..27c51be
--- /dev/null
+++ b/tests/mysos/scheduler/test_zk_state.py
@@ -0,0 +1,81 @@
+import cPickle
+import os
+import unittest
+
+from twitter.mysos.scheduler.state import (
+    MySQLCluster,
+    MySQLTask,
+    Scheduler,
+    StateProvider
+)
+from twitter.mysos.scheduler.zk_state import ZooKeeperStateProvider
+
+from kazoo.handlers.threading import SequentialThreadingHandler
+from mesos.interface.mesos_pb2 import FrameworkInfo
+import pytest
+from zake.fake_client import FakeClient
+from zake.fake_storage import FakeStorage
+
+
+if 'MYSOS_DEBUG' in os.environ:
+  from twitter.common import log
+  from twitter.common.log.options import LogOptions
+  LogOptions.set_stderr_log_level('google:DEBUG')
+  LogOptions.set_simple(True)
+  log.init('mysos_tests')
+
+
+class TestZooKeeperStateProvider(unittest.TestCase):
+  def setUp(self):
+    self._storage = FakeStorage(SequentialThreadingHandler())
+    self._client = FakeClient(storage=self._storage)
+    self._client.start()
+    self._state_provider = ZooKeeperStateProvider(self._client, '/mysos')
+
+  def tearDown(self):
+    self._client.stop()
+
+  def test_scheduler_state(self):
+    expected = Scheduler(FrameworkInfo(
+        user='test_user',
+        name='test_fw_name',
+        checkpoint=True))
+    expected.tasks = dict(taks1='cluster1', task2='cluster2')
+
+    self._state_provider.dump_scheduler_state(expected)
+    actual = self._state_provider.load_scheduler_state()
+
+    assert expected.framework_info == actual.framework_info
+    assert expected.tasks == actual.tasks
+
+  def test_scheduler_state_errors(self):
+    assert not self._state_provider.load_scheduler_state()  # Not an error for scheduler state to be
+                                                            # not found.
+
+    self._client.ensure_path("/mysos/state")
+    self._client.create("/mysos/state/scheduler", cPickle.dumps(object()))
+    with pytest.raises(StateProvider.Error):
+      self._state_provider.load_scheduler_state()
+
+  def test_cluster_state(self):
+    expected = MySQLCluster('cluster1', 'cluster_user', 'cluster_password', 3)
+
+    expected.tasks['task1'] = MySQLTask(
+        'cluster1', 'task1', 'slave1', 'host1', 10000)
+
+    self._state_provider.dump_cluster_state(expected)
+    actual = self._state_provider.load_cluster_state('cluster1')
+
+    assert expected.user == actual.user
+    assert isinstance(actual.num_nodes, int)
+    assert expected.num_nodes == actual.num_nodes
+    assert len(expected.tasks) == len(actual.tasks)
+    assert expected.tasks['task1'].port == actual.tasks['task1'].port
+
+  def test_cluster_state_errors(self):
+    assert not self._state_provider.load_cluster_state('nonexistent')
+
+    self._client.ensure_path("/mysos/state/clusters")
+    self._client.create("/mysos/state/clusters/cluster1", cPickle.dumps(object()))
+    with pytest.raises(StateProvider.Error):
+      self._state_provider.load_cluster_state('cluster1')
diff --git a/tox.ini b/tox.ini
new file mode 100644
index 0000000..14ad2d2
--- /dev/null
+++ b/tox.ini
@@ -0,0 +1,8 @@
+[tox]
+envlist = py27
+
+[testenv]
+deps = pytest
+install_command = pip install -e .[test] --find-links {toxinidir}/3rdparty {opts} {packages}
+# TODO(xujyan): Fix up 'test_scheduler_runs'.
+commands = py.test -v -k 'not test_scheduler_runs' tests {posargs:}
diff --git a/twitter/__init__.py b/twitter/__init__.py
new file mode 100644
index 0000000..de40ea7
--- /dev/null
+++ b/twitter/__init__.py
@@ -0,0 +1 @@
+__import__('pkg_resources').declare_namespace(__name__)
diff --git a/twitter/mysos/__init__.py b/twitter/mysos/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/twitter/mysos/__init__.py
diff --git a/twitter/mysos/common/__init__.py b/twitter/mysos/common/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/twitter/mysos/common/__init__.py
diff --git a/twitter/mysos/common/cluster.py b/twitter/mysos/common/cluster.py
new file mode 100644
index 0000000..d67de2e
--- /dev/null
+++ b/twitter/mysos/common/cluster.py
@@ -0,0 +1,339 @@
+import Queue
+import functools
+import posixpath
+import sys
+import threading
+
+from twitter.common import log
+from twitter.common.zookeeper.serverset.endpoint import ServiceInstance
+from twitter.mysos.common import zookeeper
+
+from kazoo.client import KazooClient
+from kazoo.exceptions import NoNodeError
+from kazoo.protocol.states import EventType
+from kazoo.recipe.watchers import ChildrenWatch, DataWatch
+
+
+def get_cluster_path(zk_root, cluster_name):
+  """
+    :param zk_root: the root path for the mysos scheduler.
+    :param cluster_name: Name of the the cluster.
+    :return: The path for the cluster.
+  """
+  return posixpath.join(zk_root, cluster_name)
+
+
+class Cluster(object):
+  """
+    A class that represents all members of the MySQL cluster.
+
+    A newly added cluster member becomes a read-only slave until it's promoted to a master.
+    Only the master can write.
+
+    The members of the cluster are maintained in two ZooKeeper groups: a slaves group and a master
+    group under the same 'directory'. Slaves have unique member IDs backed by ZooKeeper's sequential
+    ZNodes. When a slave is promoted to a master, it is moved (its ID preserved) from the slave
+    group to the master group.
+
+    There is at most one member in the master group.
+  """
+  SLAVES_GROUP = 'slaves'
+  MASTER_GROUP = 'master'
+  MEMBER_PREFIX = "member_"  # Use the prefix so the path conforms to the ServerSet convention.
+
+  def __init__(self, cluster_path):
+    self.cluster_path = cluster_path
+    self.members = {}  # {ID : (serialized) ServiceInstance} mappings for members of the cluster.
+    self.master = None  # The master's member ID.
+    self.slaves_group = posixpath.join(cluster_path, self.SLAVES_GROUP)
+    self.master_group = posixpath.join(cluster_path, self.MASTER_GROUP)
+
+
+# TODO(jyx): Handle errors e.g. sessions expirations and recoverable failures.
+class ClusterManager(object):
+  """
+    Kazoo wrapper used by the scheduler to inform executors about cluster change.
+    NOTE: ClusterManager is thread safe, i.e., it can be accessed from multiple threads at once.
+  """
+
+  class Error(Exception): pass
+
+  def __init__(self, client, cluster_path):
+    """
+      :param client: Kazoo client.
+      :param cluster_path: The path for this cluster on ZooKeeper.
+    """
+    self._client = client
+    self._cluster = Cluster(cluster_path)
+    self._lock = threading.Lock()
+    self._populate()
+
+  def _read_child_content(self, group, member_id):
+    try:
+      return self._client.get(posixpath.join(group, member_id))[0]
+    except NoNodeError:
+      return None
+
+  def _populate(self):
+    self._client.ensure_path(self._cluster.slaves_group)
+    self._client.ensure_path(self._cluster.master_group)
+
+    # Populate slaves.
+    for child in self._client.get_children(self._cluster.slaves_group):
+      child_content = self._read_child_content(self._cluster.slaves_group, child)
+      if child_content:
+        self._cluster.members[child] = child_content
+
+    # Populate the master.
+    master_group = self._client.get_children(self._cluster.master_group)
+    assert len(master_group) <= 1
+    if len(master_group) == 1:
+      child = master_group[0]
+      child_content = self._read_child_content(self._cluster.master_group, child)
+      if child_content:
+        self._cluster.members[child] = child_content
+        self._cluster.master = child
+
+  def add_member(self, service_instance):
+    """
+      Add the member to the ZooKeeper group.
+      NOTE:
+        - New members are slaves until being promoted.
+        - A new member is not added if the specified service_instance already exists in the group.
+      :return: The member ID for the ServiceInstance generated by ZooKeeper.
+    """
+    if not isinstance(service_instance, ServiceInstance):
+      raise TypeError("'service_instance' should be a ServiceInstance")
+
+    content = ServiceInstance.pack(service_instance)
+
+    for k, v in self._cluster.members.items():
+      if content == v:
+        log.info("%s not added because it already exists in the group" % service_instance)
+        return k
+
+    znode_path = self._client.create(
+        posixpath.join(self._cluster.slaves_group, self._cluster.MEMBER_PREFIX),
+        content,
+        sequence=True)
+    _, member_id = posixpath.split(znode_path)
+    with self._lock:
+      self._cluster.members[member_id] = content
+      return member_id
+
+  def remove_member(self, member_id):
+    """
+      Remove the member if it is in the group.
+
+      :return: True if the member is deleted. False if the member cannot be found.
+    """
+    with self._lock:
+      if member_id not in self._cluster.members:
+        log.info("Member %s is not in the ZK group" % member_id)
+        return False
+
+      self._cluster.members.pop(member_id, None)
+
+      if member_id == self._cluster.master:
+        self._cluster.master = None
+        self._client.delete(posixpath.join(self._cluster.master_group, member_id))
+      else:
+        self._client.delete(posixpath.join(self._cluster.slaves_group, member_id))
+
+      return True
+
+  def promote_member(self, member_id):
+    """
+      Promote the member with the given ID to be the master of the cluster if it's not already the
+      master.
+
+      :return: True if the member is promoted. False if the member is already the master.
+    """
+    with self._lock:
+      if member_id not in self._cluster.members:
+        raise ValueError("Invalid member_id: %s" % member_id)
+
+      # Do nothing if the member is already the master.
+      if self._cluster.master and self._cluster.master == member_id:
+        log.info("Not promoting %s because is already the master" % member_id)
+        return False
+
+      tx = self._client.transaction()
+      if self._cluster.master:
+        tx.delete(posixpath.join(self._cluster.master_group, self._cluster.master))
+        self._cluster.members.pop(self._cluster.master)
+
+      # "Move" the ZNode, i.e., create a ZNode of the same ID in the master group.
+      tx.delete(posixpath.join(self._cluster.slaves_group, member_id))
+      tx.create(
+          posixpath.join(self._cluster.master_group, member_id),
+          self._cluster.members[member_id])
+
+      tx.commit()
+
+      self._cluster.master = member_id
+
+      return True
+
+  def delete_cluster(self):
+    with self._lock:
+      if self._cluster.members:
+        raise self.Error("Cannot remove a cluster that is not empty")
+
+      # Need to delete master/slave sub-dirs.
+      self._client.delete(self._cluster.cluster_path, recursive=True)
+
+
+# TODO(wickman): Implement kazoo connection acquiescence.
+class ClusterListener(object):
+  """Kazoo wrapper used by the executor to listen to cluster change."""
+
+  def __init__(self,
+               client,
+               cluster_path,
+               self_instance=None,
+               promotion_callback=None,
+               demotion_callback=None,
+               master_callback=None,
+               termination_callback=None):
+    """
+      :param client: Kazoo client.
+      :param cluster_path: The path for this cluster on ZooKeeper.
+      :param self_instance: The local ServiceInstance associated with this listener.
+      :param promotion_callback: Invoked when 'self_instance' is promoted.
+      :param demotion_callback: Invoked when 'self_instance' is demoted.
+      :param master_callback: Invoked when there is a master change otherwise.
+      :param termination_callback: Invoked when the cluster is terminated.
+      NOTE: Callbacks are executed synchronously in Kazoo's completion thread to ensure the delivery
+            order of events. Blocking the callback method means no future callbacks will be invoked.
+    """
+    self._client = client
+    self._cluster = Cluster(cluster_path)
+    self._self_content = ServiceInstance.pack(self_instance) if self_instance else None
+    self._master = None
+    self._master_content = None
+    self._promotion_callback = promotion_callback or (lambda: True)
+    self._demotion_callback = demotion_callback or (lambda: True)
+    self._master_callback = master_callback or (lambda x: True)
+    self._termination_callback = termination_callback or (lambda: True)
+
+    self._children_watch = None  # Set when the watcher detects that the master group exists.
+
+  def start(self):
+    """
+      Start the listener to watch the master group.
+
+      NOTE: The listener only starts watching master after the base ZNode for the group is created.
+    """
+    DataWatch(self._client, self._cluster.cluster_path, func=self._cluster_path_callback)
+    DataWatch(self._client, self._cluster.master_group, func=self._master_group_callback)
+
+  def _swap(self, master, master_content):
+    i_was_master = self._self_content and self._master_content == self._self_content
+    self._master, self._master_content = master, master_content
+    i_am_master = self._self_content and self._master_content == self._self_content
+
+    # Invoke callbacks accordingly.
+    # NOTE: No callbacks are invoked if there is currently no master and 'self_instance' wasn't the
+    # master.
+    if i_was_master and not i_am_master:
+      self._demotion_callback()
+    elif not i_was_master and i_am_master:
+      self._promotion_callback()
+    elif not i_was_master and not i_am_master and master:
+      assert master_content
+      self._master_callback(ServiceInstance.unpack(master_content))
+
+  def _data_callback(self, master_id, master_completion):
+    try:
+      master_content, _ = master_completion.get()
+    except NoNodeError:
+      # ZNode could be gone after we detected it but before we read it.
+      master_id, master_content = None, None
+    self._swap(master_id, master_content)
+
+  def _child_callback(self, masters):
+    assert len(masters) <= 1, "There should be at most one master"
+
+    if len(masters) == 1 and self._master != masters[0]:
+      self._client.get_async(posixpath.join(self._cluster.master_group, masters[0])).rawlink(
+          functools.partial(self._data_callback, masters[0]))
+    elif len(masters) == 0:
+      self._swap(None, None)
+
+  def _cluster_path_callback(self, data, stat, event):
+    if event and event.type == EventType.DELETED:
+      self._termination_callback()
+
+  def _master_group_callback(self, data, stat, event):
+    if stat and not self._children_watch:
+      log.info("Master group %s exists. Starting to watch for election result" %
+               self._cluster.master_group)
+      self._children_watch = ChildrenWatch(
+          self._client, self._cluster.master_group, func=self._child_callback)
+
+
+def resolve_master(
+      cluster_url, master_callback=lambda: True, termination_callback=lambda: True, zk_client=None):
+  """
+    Resolve the MySQL cluster master's endpoint from the given URL for this cluster.
+    :param cluster_url: The ZooKeeper URL for this cluster.
+    :param master_callback: A callback method with one argument: the ServiceInstance for the elected
+                            master.
+    :param termination_callback: A callback method with no argument. Invoked when the cluster
+                                 terminates.
+    :param zk_client: Use a custom ZK client instead of Kazoo if specified.
+  """
+  try:
+    _, zk_servers, cluster_path = zookeeper.parse(cluster_url)
+  except Exception as e:
+    raise ValueError("Invalid cluster_url: %s" % e.message)
+
+  if not zk_client:
+    zk_client = KazooClient(zk_servers)
+    zk_client.start()
+
+  listener = ClusterListener(
+      zk_client,
+      cluster_path,
+      None,
+      master_callback=master_callback,
+      termination_callback=termination_callback)
+  listener.start()
+
+
+def wait_for_master(cluster_url, zk_client=None):
+  """
+    Convenience function to wait for the master to be elected and return the master.
+    :param cluster_url: The ZooKeeper URL for this cluster.
+    :param zk_client: Use a custom ZK client instead of Kazoo if specified.
+    :return: The ServiceInstance for the elected master.
+  """
+  master = Queue.Queue()
+  resolve_master(
+      cluster_url,
+      master_callback=lambda x: master.put(x),
+      termination_callback=lambda: True,
+      zk_client=zk_client)
+  # Block forever but using sys.maxint makes the wait interruptable by Ctrl-C. See
+  # http://bugs.python.org/issue1360.
+  return master.get(True, sys.maxint)
+
+
+def wait_for_termination(cluster_url, zk_client=None):
+  """
+    Convenience function to wait for the cluster to terminate. The corresponding ZNode is removed
+    when the cluster terminates.
+    :param cluster_url: The ZooKeeper URL for this cluster.
+    :param zk_client: Use a custom ZK client instead of Kazoo if specified.
+  """
+  terminated = threading.Event()
+  resolve_master(
+    cluster_url,
+    master_callback=lambda x: True,
+    termination_callback=lambda: terminated.set(),
+    zk_client=zk_client)
+
+  # Block forever but using sys.maxint makes the wait interruptable by Ctrl-C. See
+  # http://bugs.python.org/issue1360.
+  terminated.wait(sys.maxint)
diff --git a/twitter/mysos/common/decorators.py b/twitter/mysos/common/decorators.py
new file mode 100644
index 0000000..4c54a01
--- /dev/null
+++ b/twitter/mysos/common/decorators.py
@@ -0,0 +1,24 @@
+import functools
+import inspect
+
+from twitter.common import log
+
+
+def logged(func):
+  arg_names = inspect.getargspec(func).args[1:]
+  @functools.wraps(func)
+  def wrapped_func(self, *args):
+    log.debug('%s(%s)' % (
+      func.__name__,
+      ', '.join('%s=%s' % (name, arg) for (name, arg) in zip(arg_names, args))))
+    return func(self, *args)
+  return wrapped_func
+
+
+def synchronized(func):
+  @functools.wraps(func)
+  def synchronizer(self, *args, **kwargs):
+    assert hasattr(self, '_lock'), "Need to define a _lock to use this decorator"
+    with self._lock:
+      return func(self, *args, **kwargs)
+  return synchronizer
diff --git a/twitter/mysos/common/fetcher.py b/twitter/mysos/common/fetcher.py
new file mode 100644
index 0000000..e73ca52
--- /dev/null
+++ b/twitter/mysos/common/fetcher.py
@@ -0,0 +1,34 @@
+from abc import abstractmethod
+
+from twitter.common.lang import Interface
+
+
+class Fetcher(Interface):
+  class Error(Exception): pass
+
+  @abstractmethod
+  def fetch(self, uri, directory):
+    pass
+
+
+class FetcherFactory(object):
+  """A singleton factory for Fetchers."""
+
+  _FETCHERS = {}
+
+  @classmethod
+  def register_fetcher(cls, scheme, fetcher):
+    cls._FETCHERS[scheme.rstrip('://')] = fetcher
+
+  @classmethod
+  def get_fetcher(cls, uri):
+    """
+      :return: A Fetcher instance that matches this URI. None if no fetcher is registered with the
+               URI's scheme.
+    """
+    scheme = uri.split('://')[0]
+    fetcher = cls._FETCHERS.get(scheme)
+    if not fetcher:
+      raise ValueError("No Fetcher is registered for URI scheme '%s'" % scheme)
+
+    return fetcher
diff --git a/twitter/mysos/common/hdfs.py b/twitter/mysos/common/hdfs.py
new file mode 100644
index 0000000..327128c
--- /dev/null
+++ b/twitter/mysos/common/hdfs.py
@@ -0,0 +1,38 @@
+import os
+
+from twitter.common import log
+from twitter.common.concurrent import deadline, Timeout
+from twitter.common.fs import HDFSHelper
+from twitter.common.quantity import Amount, Data, Time
+
+from .fetcher import Fetcher
+
+
+HADOOP_CONF_DIR = '/etc/hadoop/conf'
+
+
+class HDFSFetcher(Fetcher):
+  """
+    NOTE: Specify custom config directory using the environment variable 'HADOOP_CONF_DIR'.
+  """
+
+  def __init__(self, timeout=Amount(5, Time.MINUTES)):
+    if not isinstance(timeout, Amount) or not isinstance(timeout.unit(), Time):
+      raise ValueError("'timeout' must be an Amount of Time")
+    self._timeout = timeout
+
+  def fetch(self, uri, directory):
+    log.info("Fetching %s from HDFS" % uri)
+
+    if "JAVA_HOME" in os.environ:
+      log.info("Using JAVA_HOME '%s' for HDFS commands" % os.environ["JAVA_HOME"])
+
+    config = os.environ.get("HADOOP_CONF_DIR", HADOOP_CONF_DIR)
+    h = HDFSHelper(config, heap_limit=Amount(256, Data.MB))
+    try:
+      f = lambda: h.copy_to_local(uri, directory)
+      deadline(f, timeout=self._timeout, propagate=True, daemon=True)
+    except HDFSHelper.InternalError as e:
+      raise self.Error('Unable to fetch HDFS package: %s' % e)
+    except Timeout as e:
+      raise self.Error("Failed to fetch package from HDFS within : %s" % (self._timeout, e))
diff --git a/twitter/mysos/common/pkgutil.py b/twitter/mysos/common/pkgutil.py
new file mode 100644
index 0000000..69ba56f
--- /dev/null
+++ b/twitter/mysos/common/pkgutil.py
@@ -0,0 +1,41 @@
+import os
+
+from twitter.common.dirutil import safe_mkdir
+
+import pkg_resources
+
+
+def unpack_assets(output_dir, module, asset_path, execute=lambda x: None):
+  """
+    Extract files from a module in a package into 'output_dir'.
+
+    :param output_dir: The directory to copy the assets *root* to.
+    :param module: The module in the package to find the assets in. e.g., twitter.mysos.executor.
+    :param asset_path: The path of the asset relative to the module root to unpack.
+    :param execute: A function that expects a single argument as the path to an asset file. It can
+                    be used to process this file.
+
+    NOTE: If the specified 'asset_path' is a directory, its contents are copied but it itself is not
+          recreated in the output directory. e.g., <module_dir>/files/bin/file.sh is copied to
+          <output_dir>/bin/file.sh. An analogy is that its like `cp -R asset_path/* output_dir` and
+          not like `cp -R asset_path output_dir`.
+  """
+  _unpack_assets(output_dir, module, asset_path, execute, asset_path)
+
+
+def _unpack_assets(output_dir, module, asset_root, execute, current_path):
+  """
+    The internal helper function for unpack_assets(...) recursion.
+    :param current_path: Records the current
+  """
+  for asset in pkg_resources.resource_listdir(module, current_path):
+    asset_target = os.path.join(os.path.relpath(current_path, asset_root), asset)
+    if pkg_resources.resource_isdir(module, os.path.join(current_path, asset)):
+      safe_mkdir(os.path.join(output_dir, asset_target))
+      _unpack_assets(output_dir, module, asset_root, execute, os.path.join(current_path, asset))
+    else:
+      output_file = os.path.join(output_dir, asset_target)
+      with open(output_file, 'wb') as fp:
+        fp.write(pkg_resources.resource_string(
+            module, os.path.join(asset_root, asset_target)))
+        execute(output_file)
diff --git a/twitter/mysos/common/testing.py b/twitter/mysos/common/testing.py
new file mode 100644
index 0000000..a4aa4cf
--- /dev/null
+++ b/twitter/mysos/common/testing.py
@@ -0,0 +1,29 @@
+from collections import defaultdict
+import subprocess
+
+
+class Fake(object):
+  """
+    A fake object that does nothing but recording the method calls and arguments.
+  """
+
+  def __init__(self):
+    self.method_calls = defaultdict(list)
+
+  def __getattr__(self, attr):
+    def enqueue_arguments(*args, **kw):
+      self.method_calls[attr].append((args, kw))
+    return enqueue_arguments
+
+
+def build_and_execute_pex_target(target, binary):
+  """
+    :param target: The pants target.
+    :param binary: The path to the pex binary relative to the root of the repository.
+  """
+  assert subprocess.call(["./pants", "goal", "binary", target]) == 0
+
+  p = subprocess.Popen([binary, "--help"], stderr=subprocess.STDOUT, stdout=subprocess.PIPE)
+  out, err = p.communicate()
+  assert p.returncode == 1
+  assert out.startswith('Options'), 'Unexpected build output: %s' % out
diff --git a/twitter/mysos/common/zookeeper.py b/twitter/mysos/common/zookeeper.py
new file mode 100644
index 0000000..44ba7d8
--- /dev/null
+++ b/twitter/mysos/common/zookeeper.py
@@ -0,0 +1,34 @@
+import string
+
+
+def parse(url):
+  """
+    Parse ZooKeeper URL.
+    :param url: The URL in the form of "zk://username:password@servers/path".
+    :return: Tuple (credential, servers, path).
+             credential: Credential for authentication with "digest" scheme. Optional and default to
+                         None.
+             servers: Compatible with Kazoo's 'hosts' argument.
+             path: Optional and default to '/'.
+    NOTE: This method doesn't validate the values in the returned tuple.
+  """
+  index = string.find(url, "zk://")
+  if index != 0:
+    raise ValueError("Expecting 'zk://' at the beginning of the URL")
+
+  url = string.lstrip(url, "zk://")
+
+  try:
+    servers, path = string.split(url, '/', 1)
+  except ValueError:
+    servers = url
+    path = ''
+
+  path = '/' + path
+
+  try:
+    credential, servers = string.split(servers, '@', 1)
+  except ValueError:
+    credential = None
+
+  return credential, servers, path
diff --git a/twitter/mysos/executor/__init__.py b/twitter/mysos/executor/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/twitter/mysos/executor/__init__.py
diff --git a/twitter/mysos/executor/backup.py b/twitter/mysos/executor/backup.py
new file mode 100644
index 0000000..c3cf221
--- /dev/null
+++ b/twitter/mysos/executor/backup.py
@@ -0,0 +1,55 @@
+from abc import abstractmethod
+
+from twitter.common.lang import Interface
+
+
+class BackupInfo(object):
+  def __init__(self, backup_file, cold_backup):
+    self.backup_file = backup_file
+    self.cold_backup = cold_backup
+
+
+class BackupStore(Interface):
+  """
+    The storage for Mysos executor state backup (i.e. MySQL data, etc.).
+
+    Thread-safety: The BackupStore implementation is not expected to be thread-safe and the caller
+                   should be responsible for it.
+  """
+
+  class Error(Exception): pass
+  class BackupNotFoundError(Error): pass
+
+  @abstractmethod
+  def restore(self):
+    """
+      Restore the backup.
+
+      :return: The BackupInfo object. None if no state is restored.
+    """
+    pass
+
+
+class BackupStoreProvider(Interface):
+  @abstractmethod
+  def from_task(self, task, sandbox):
+    """
+      Factory method that creates a BackupStore instance from 'task' (TaskInfo).
+
+      :return: The BackupStore instance.
+    """
+    pass
+
+
+class NoopBackupStore(BackupStore):
+  """Used when no restore is requested."""
+
+  def restore(self):
+    return None  # Returning 'None' because no state is restored.
+
+
+class NoopBackupStoreProvider(BackupStoreProvider):
+  """Used when no restore is requested."""
+
+  def from_task(self, task, sandbox):
+    return NoopBackupStore()
diff --git a/twitter/mysos/executor/executor.py b/twitter/mysos/executor/executor.py
new file mode 100644
index 0000000..3d7dff6
--- /dev/null
+++ b/twitter/mysos/executor/executor.py
@@ -0,0 +1,169 @@
+import json
+
+from twitter.common import log
+from twitter.common.concurrent import defer
+from twitter.mysos.common.decorators import logged
+
+from .task_runner import TaskError
+
+from mesos.interface import Executor
+import mesos.interface.mesos_pb2 as mesos_pb2
+
+
+class MysosExecutor(Executor):
+  """
+    MysosExecutor is a fine-grained executor, i.e., one executor executes a single task.
+  """
+
+  def __init__(self, runner_provider, sandbox):
+    """
+      :param runner_provider: An implementation of TaskRunnerProvider.
+      :param sandbox: The path to the sandbox where all files the executor reads/writes are located.
+    """
+    self._runner_provider = runner_provider
+    self._runner = None  # A singleton task runner created by launchTask().
+    self._driver = None  # Assigned in registered().
+    self._killed = False  # True if the executor's singleton task is killed by the scheduler.
+    self._sandbox = sandbox
+
+  # --- Mesos methods. ---
+  @logged
+  def registered(self, driver, executorInfo, frameworkInfo, slaveInfo):
+    log.info('Registered with slave: %s' % slaveInfo)
+    self._driver = driver  # Cache the driver to kill later.
+
+  @logged
+  def reregistered(self, driver, slaveInfo):
+    log.info('Reregistered with slave: %s' % slaveInfo)
+
+  @logged
+  def disconnected(self, driver):
+    log.info("ExecutorDriver disconnected from Mesos slave")
+
+  @logged
+  def launchTask(self, driver, task):
+    if self._runner:
+      log.error("Executor allows only one task")
+      update = mesos_pb2.TaskStatus()
+      update.state = mesos_pb2.TASK_FAILED
+      driver.sendStatusUpdate(update)
+      return
+
+    # Create the runner here in the driver thread so subsequent task launches are rejected.
+    try:
+      self._runner = self._runner_provider.from_task(task, self._sandbox)
+    except (TaskError, ValueError) as e:
+      # TODO(jyx): These should really all be 'ValueError's from all providers because they are
+      # simply factory methods.
+      log.error("Failed to create TaskRunner: %s" % e.message)
+      self._send_update(task.task_id.value, mesos_pb2.TASK_FAILED, e.message)
+      self._kill()
+      return
+
+    # Run the task in a separate daemon thread.
+    defer(lambda: self._run_task(task))
+
+  def _run_task(self, task):
+    assert self._runner, "_runner should be created before this method is called"
+
+    try:
+      self._runner.start()
+      log.info("Task runner for task %s started" % task.task_id)
+
+      self._send_update(task.task_id.value, mesos_pb2.TASK_RUNNING)
+    except TaskError as e:
+      log.error("Task runner for task %s failed to start: %s" % (task.task_id, str(e)))
+      # Send TASK_FAILED if the task failed to start.
+      self._send_update(task.task_id.value, mesos_pb2.TASK_FAILED)
+    except Exception as e:
+      log.error("Error occurred while executing the task: %s" % e)
+      # Send TASK_LOST for unknown errors.
+      self._send_update(task.task_id.value, mesos_pb2.TASK_LOST)
+
+    # Wait for the task's return code (when it terminates).
+    try:
+      returncode = self._runner.join()
+      # Regardless of the return code, if '_runner' terminates, it failed!
+      log.error("Task process terminated with return code %s" % returncode)
+    except TaskError as e:
+      log.error("Task terminated: %s" % e)
+
+    if self._killed:
+      self._send_update(task.task_id.value, mesos_pb2.TASK_KILLED)
+    else:
+      self._send_update(task.task_id.value, mesos_pb2.TASK_FAILED)
+
+    self._kill()
+
+  @logged
+  def frameworkMessage(self, driver, message):
+    if not self._runner:
+      log.info('Ignoring framework message because no task is running yet')
+      return
+
+    defer(lambda: self._framework_message(message))
+
+  def _framework_message(self, message):
+    master_epoch = message  # The log position request is for electing the master of this 'epoch'.
+    try:
+      position = self._runner.get_log_position()
+      log.info('Obtained log position %s for epoch %s' % (position, master_epoch))
+
+      assert self._driver
+
+      # TODO(jyx): Define the message in ProtoBuf or Thrift.
+      self._driver.sendFrameworkMessage(json.dumps({
+          'epoch': master_epoch,  # Send the epoch back without parsing it.
+          'position': position
+      }))
+    except TaskError as e:
+      # Log the error and do not reply to the framework.
+      log.error("Committing suicide due to failure to process framework message: %s" % e)
+      self._kill()
+
+  @logged
+  def killTask(self, driver, taskId):
+    # Killing the task also kills the executor because there is one task per executor.
+    log.info("Asked to kill task %s" % taskId)
+    self._killed = True
+    self._kill()
+
+  def _kill(self):
+    if self._runner:
+      self._runner.stop()  # It could be already stopped. If so, self._runner.stop() is a no-op.
+
+    assert self._driver
+
+    # TODO(jyx): Fix https://issues.apache.org/jira/browse/MESOS-243.
+    self._driver.stop()
+
+  @logged
+  def shutdown(self, driver):
+    log.info("Asked to shut down")
+    self._killed = True
+    self._kill()
+
+  @logged
+  def error(self, driver, message):
+    log.error("Shutting down due to error: %s" % message)
+    self._killed = True
+    self._kill()
+
+  def _send_update(self, task_id, state, message=None):
+    update = mesos_pb2.TaskStatus()
+    if not isinstance(state, int):
+      raise TypeError('Invalid state type %s, should be int.' % type(state))
+    if state not in [
+        mesos_pb2.TASK_STARTING,
+        mesos_pb2.TASK_RUNNING,
+        mesos_pb2.TASK_FINISHED,
+        mesos_pb2.TASK_KILLED,
+        mesos_pb2.TASK_FAILED,
+        mesos_pb2.TASK_LOST]:
+      raise ValueError('Invalid state: %s' % state)
+    update.state = state
+    update.task_id.value = task_id
+    if message:
+      update.message = str(message)
+    log.info('Updating %s => %s. Reason: %s' % (task_id, mesos_pb2.TaskState.Name(state), message))
+    self._driver.sendStatusUpdate(update)
diff --git a/twitter/mysos/executor/files/bin/mysql/scripts/mysos_install_db.sh b/twitter/mysos/executor/files/bin/mysql/scripts/mysos_install_db.sh
new file mode 100755
index 0000000..bf4dbee
--- /dev/null
+++ b/twitter/mysos/executor/files/bin/mysql/scripts/mysos_install_db.sh
@@ -0,0 +1,24 @@
+#!/bin/sh
+#
+# Install the MySQL server files before starting 'mysqld'.
+#
+
+set -uex
+
+framework_user=$1
+data_dir=$2
+conf_file=$3
+
+# Expecting mysqld to be under $mysql_basedir/bin/
+mysql_basedir=$(dirname $(dirname $(which mysqld)))
+
+# Remove the datadir if any since we are creating a new instance.
+rm -rf $data_dir
+
+# Initialize the DB.
+mysql_install_db \
+  --defaults-file=$conf_file \
+  --datadir=$data_dir \
+  --user=$framework_user \
+  --bind-address=0.0.0.0 \
+  --basedir=$mysql_basedir
\ No newline at end of file
diff --git a/twitter/mysos/executor/files/bin/mysql/scripts/mysos_launch_mysqld.sh b/twitter/mysos/executor/files/bin/mysql/scripts/mysos_launch_mysqld.sh
new file mode 100755
index 0000000..5a2ba90
--- /dev/null
+++ b/twitter/mysos/executor/files/bin/mysql/scripts/mysos_launch_mysqld.sh
@@ -0,0 +1,40 @@
+#!/bin/sh
+
+set -uex
+
+framework_user=$1
+host=$2
+port=$3
+server_id=$4
+data_dir=$5
+log_dir=$6
+tmp_dir=$7
+conf_file=$8
+buffer_pool_size=$9
+
+# Expecting mysqld to be under $mysql_basedir/bin/
+mysql_basedir=$(dirname $(dirname $(which mysqld)))
+
+# Need a temp directory under /tmp because the sandbox path is too long for '--socket'. We also need
+# this path to be unique on the host.
+socket_tmp=`mktemp -d`
+
+# Start the server in read only mode.
+mysqld \
+  --defaults-file=$conf_file \
+  --user=$framework_user \
+  --port=$port \
+  --server-id=$server_id \
+  --socket=$socket_tmp/mysql.sock \
+  --pid-file=$log_dir/mysqld.pid \
+  --basedir=$mysql_basedir \
+  --datadir=$data_dir \
+  --tmpdir=$tmp_dir \
+  --innodb_data_home_dir=$data_dir \
+  --innodb_log_group_home_dir=$log_dir \
+  --log-error=$data_dir/mysql-error.log \
+  --log-bin=$log_dir/mysql-bin \
+  --relay-log=$log_dir/mysql-relay-bin \
+  --relay-log-index=$log_dir/mysql-relay-bin.index \
+  --innodb_buffer_pool_size=$buffer_pool_size \
+  --skip-grant-tables
diff --git a/twitter/mysos/executor/files/bin/mysql/scripts/mysos_log_position.sh b/twitter/mysos/executor/files/bin/mysql/scripts/mysos_log_position.sh
new file mode 100755
index 0000000..a205021
--- /dev/null
+++ b/twitter/mysos/executor/files/bin/mysql/scripts/mysos_log_position.sh
@@ -0,0 +1,20 @@
+#!/bin/sh
+#
+# Get the log position of the MySQL slave.
+#
+
+set -uxe
+
+slave_host=$1
+slave_port=$2
+
+# Get the relay log file.
+relay_master_log_file=`mysql -u root -P $slave_port -h $slave_host -e "show slave status\G;" | \
+  grep Relay_Master_Log_File | awk '{print $2}'`
+
+# Get the relay log position.
+exec_master_log_pos=`mysql -u root -P $slave_port -h $slave_host -e "show slave status\G;"  | \
+  grep Exec_Master_Log_Pos | awk '{print $2}'`
+
+# The output can be empty if the slave has not set up replication.
+echo $relay_master_log_file,$exec_master_log_pos
\ No newline at end of file
diff --git a/twitter/mysos/executor/files/bin/mysql/scripts/mysos_promote_master.sh b/twitter/mysos/executor/files/bin/mysql/scripts/mysos_promote_master.sh
new file mode 100755
index 0000000..722f902
--- /dev/null
+++ b/twitter/mysos/executor/files/bin/mysql/scripts/mysos_promote_master.sh
@@ -0,0 +1,31 @@
+#!/bin/sh
+#
+# Promote the MySQL slave to be a master.
+#
+
+set -uex
+
+host=$1
+port=$2
+user=$3
+password=$4
+admin_user=$5
+admin_passwd=$6
+
+# Stop and reset the slave.
+mysql -u root -P $port -h $host -e "STOP SLAVE; RESET SLAVE ALL;
+
+# Put the master in read-write mode.
+SET GLOBAL read_only = 0; UNLOCK TABLES;
+
+# This reloads the grant tables so the following account-management statements can work.
+FLUSH PRIVILEGES;
+
+# Grant all permissions to the admin user (and create it if not exists).
+GRANT ALL ON *.* to '$admin_user'@'%' IDENTIFIED BY '$admin_passwd' WITH GRANT OPTION;
+
+# Grant all permissions to the user (and create it if not exists).
+GRANT ALL ON *.* to '$user'@'%' IDENTIFIED BY '$password' WITH GRANT OPTION;
+
+# Drop anonymous user.
+DELETE FROM mysql.user WHERE user=''; FLUSH PRIVILEGES;"
diff --git a/twitter/mysos/executor/files/bin/mysql/scripts/mysos_reparent.sh b/twitter/mysos/executor/files/bin/mysql/scripts/mysos_reparent.sh
new file mode 100755
index 0000000..c609925
--- /dev/null
+++ b/twitter/mysos/executor/files/bin/mysql/scripts/mysos_reparent.sh
@@ -0,0 +1,49 @@
+#!/bin/sh
+#
+# Reparent the slave to a new master.
+#
+
+set -uxe
+
+master_host=$1
+master_port=$2
+slave_host=$3
+slave_port=$4
+admin_user=$5
+admin_passwd=$6
+
+# Stop the replication (if any).
+mysql -u root -P $slave_port -h $slave_host -e "STOP SLAVE;"
+
+# Get the relay log file.
+relay_master_log_file=`mysql -u root -P $slave_port -h $slave_host -e "show slave status\G;" | \
+  grep Relay_Master_Log_File | awk '{print $2}'`
+
+# Get the relay log position.
+exec_master_log_pos=`mysql -u root -P $slave_port -h $slave_host -e "show slave status\G;" | \
+  grep Exec_Master_Log_Pos | awk '{print $2}'`
+
+# TODO(vinod): Make sure the slave processed the relay log.
+
+# Remove the relay logs.
+mysql -u root -P $slave_port -h $slave_host -e "RESET SLAVE;"
+
+# Point to a master.
+if [ "x$relay_master_log_file" != "x" ]; then
+  mysql -u root -P $slave_port -h $slave_host -e "CHANGE MASTER TO
+    MASTER_HOST='$master_host',
+    MASTER_PORT=$master_port,
+    MASTER_USER='$admin_user',
+    MASTER_PASSWORD='$admin_passwd',
+    MASTER_LOG_FILE='$relay_master_log_file',
+    MASTER_LOG_POS=$exec_master_log_pos;"
+else
+  mysql -u root -P $slave_port -h $slave_host -e "CHANGE MASTER TO
+    MASTER_HOST='$master_host',
+    MASTER_PORT=$master_port,
+    MASTER_USER='$admin_user',
+    MASTER_PASSWORD='$admin_passwd';"
+fi
+
+# Start replication.
+mysql -u root -P $slave_port -h $slave_host -e "START SLAVE;"
diff --git a/twitter/mysos/executor/files/bin/mysql/scripts/mysos_wait_for_mysqld.sh b/twitter/mysos/executor/files/bin/mysql/scripts/mysos_wait_for_mysqld.sh
new file mode 100755
index 0000000..110d3d5
--- /dev/null
+++ b/twitter/mysos/executor/files/bin/mysql/scripts/mysos_wait_for_mysqld.sh
@@ -0,0 +1,26 @@
+#!/bin/sh
+#
+# Wait for the mysqld instance to start up and be ready for traffic.
+#
+
+set -ue
+
+path=$1
+port=$2
+timeout=$3
+
+waited=1
+while true
+do
+  if [ -f $path ]; then
+    listen=`netstat -lnt | grep $port | wc -l`
+    if [ "x$listen" = "x1" ]; then
+      exit 0
+    fi
+  fi
+  sleep 1
+  waited=`expr $waited + 1`
+  if [ $waited -ge $timeout ]; then
+    exit 1
+  fi
+done
diff --git a/twitter/mysos/executor/installer.py b/twitter/mysos/executor/installer.py
new file mode 100644
index 0000000..a8b98aa
--- /dev/null
+++ b/twitter/mysos/executor/installer.py
@@ -0,0 +1,32 @@
+from abc import abstractmethod
+
+from twitter.common.lang import Interface
+
+
+class PackageInstaller(Interface):
+  """
+    Responsible for installing MySQL and dependent packages.
+
+    NOTE: It is not responsible for installing DB instances.
+  """
+
+  class Error(Exception): pass
+
+  @abstractmethod
+  def install(self):
+    """
+      :return: The environment variables necessary for MySQL to execute.
+      :rtype: dict
+    """
+    pass
+
+
+class PackageInstallerProvider(Interface):
+  @abstractmethod
+  def from_task(self, task, sandbox):
+    """
+      Factory method that creates a PackageInstaller instance from 'task' (TaskInfo).
+
+      :return: The PackageInstaller instance.
+    """
+    pass
diff --git a/twitter/mysos/executor/mysos_task_runner.py b/twitter/mysos/executor/mysos_task_runner.py
new file mode 100644
index 0000000..97e3ba1
--- /dev/null
+++ b/twitter/mysos/executor/mysos_task_runner.py
@@ -0,0 +1,264 @@
+import Queue
+import json
+import os
+import signal
+from subprocess import CalledProcessError
+import sys
+import threading
+
+from twitter.common import log
+from twitter.common.concurrent import defer
+from twitter.common.zookeeper.serverset.endpoint import Endpoint, ServiceInstance
+from twitter.mysos.common.cluster import ClusterListener, get_cluster_path
+from twitter.mysos.common.zookeeper import parse
+
+from .installer import PackageInstaller
+from .state import StateManager
+from .task_runner import TaskError, TaskRunner, TaskRunnerProvider
+from .task_control import TaskControl
+
+from kazoo.client import KazooClient
+
+
+class MysosTaskRunnerProvider(TaskRunnerProvider):
+  def __init__(self, task_control_provider, installer_provider, backup_store_provider):
+    self._task_control_provider = task_control_provider
+    self._installer_provider = installer_provider
+    self._backup_store_provider = backup_store_provider
+
+  def from_task(self, task, sandbox):
+    data = json.loads(task.data)
+    cluster_name, host, port, zk_url = data['cluster'], data['host'], data['port'], data['zk_url']
+    _, servers, path = parse(zk_url)
+    kazoo = KazooClient(servers)
+    kazoo.start()
+    self_instance = ServiceInstance(Endpoint(host, port))
+
+    try:
+      task_control = self._task_control_provider.from_task(task, sandbox)
+      installer = self._installer_provider.from_task(task, sandbox)
+      backup_store = self._backup_store_provider.from_task(task, sandbox)
+    except (TaskControl.Error, PackageInstaller.Error) as e:
+      raise TaskError(e.message)
+
+    state_manager = StateManager(sandbox, backup_store)
+
+    return MysosTaskRunner(
+        self_instance,
+        kazoo,
+        get_cluster_path(path, cluster_name),
+        installer,
+        task_control,
+        state_manager)
+
+
+class MysosTaskRunner(TaskRunner):
+  """
+    A runner that manages the lifecycle of a MySQL task (through the provided 'task_control').
+
+    The task is executed as a long-running process its return code can be obtained using 'join()'.
+
+    Thread-safety:
+      This class is accessed from the MysosExecutor thread (not the ExecutorDriver thread because
+      MysosExecutor invokes operations asynchronously) and the ClusterListener thread and is
+      thread-safe.
+
+    TODO(jyx): Push the knowledge of the underlying subprocess down to the task control and stop the
+               the subprocess using the task control.
+  """
+
+  def __init__(self, self_instance, kazoo, cluster_root, installer, task_control, state_manager):
+    """
+      :param self_instance: The local ServiceInstance associated with this task runner.
+      :param kazoo: Kazoo client, it should be started before being passed in.
+      :param cluster_root: The ZooKeeper root path for *this cluster*.
+      :param installer: The PackageInstaller for MySQL.
+      :param task_control: The TaskControl that interacts with the task process.
+      :param state_manager: The StateManager for managing the executor state.
+    """
+    self._installer = installer
+    self._env = None  # The environment variables for the 'task_control' commands. Set by the
+                      # installer.
+
+    self._task_control = task_control
+    self._state_manager = state_manager
+
+    self._lock = threading.Lock()
+    self._popen = None  # The singleton task process started by '_task_control'.
+
+    self._started = False  # Indicates whether start() has already been called.
+    self._stopping = False  # Indicates whether stop() has already been called.
+    self._exited = threading.Event()  # Set when the task process has exited.
+    self._result = Queue.Queue()  # The returncode returned by the task process or an exception.
+
+    # Public events and queue.
+    self.promoted = threading.Event()
+    self.demoted = threading.Event()
+    self.master = Queue.Queue()  # Set when a master change is detected.
+
+    self._listener = ClusterListener(
+        kazoo,
+        cluster_root,
+        self_instance,
+        promotion_callback=self._on_promote,
+        demotion_callback=self._on_demote,
+        master_callback=self._on_master_change)  # Listener started by start().
+
+  # --- Public interface. ---
+  def start(self):
+    """
+      Start the runner in a separate thread and wait for the task process to be forked.
+    """
+    with self._lock:
+      if self._started:
+        raise TaskError("Runner already started")
+      self._started = True
+
+      # Can potentially hold the lock for a long time but it's OK since the runner is not accessed
+      # by multiple threads until after it's started; can be a noop as well, depending on the
+      # installer implementation.
+      try:
+        # 1. Install the application.
+        self._env = self._installer.install()
+        log.info("Package installation completed. Resulting environment variables: %s" % self._env)
+
+        # 2. Restore/initialize the application state.
+        self._state_manager.bootstrap(self._task_control, self._env)
+        log.info("Executor state fully bootstrapped")
+
+        # 3. Start the task subprocess.
+        # Store the process so we can kill it if necessary.
+        self._popen = self._task_control.start(env=self._env)
+        log.info("Task started in subprocess %s" % self._popen.pid)
+        defer(self._wait)
+
+        # 4. Start monitoring.
+        # Only start listening to ZK events after the task subprocess has been successfully started.
+        self._listener.start()
+      except (PackageInstaller.Error, StateManager.Error, CalledProcessError) as e:
+        raise TaskError("Failed to start MySQL task: %s" % e)
+
+  def _wait(self):
+    # Block until the subprocess exits and delivers the return code.
+    self._result.put(self._popen.wait())
+
+    # Notify stop() if it is waiting.
+    self._exited.set()
+
+  def stop(self, timeout=10):
+    """
+      Stop the runner and wait for its thread (and the sub-processes) to exit.
+
+      :param timeout: The timeout that the process should die before a hard SIGKILL is issued
+                      (SIGTERM is used initially).
+      :return: True if an active runner is stopped, False if the runner is not started or already
+               stopping/stopped.
+    """
+    if not self._started:
+      log.warn("Cannot stop the runner because it's not started")
+      return False
+
+    if self._stopping:
+      log.warn("The runner is already stopping/stopped")
+      return False
+
+    with self._lock:
+      log.info("Stopping runner")
+      self._stopping = True
+
+      if not self._popen:
+        log.info("The runner task did not start successfully so no need to kill it")
+        return False
+
+      try:
+        log.info("Terminating process group: %s" % self._popen.pid)
+        os.killpg(self._popen.pid, signal.SIGTERM)
+      except OSError as e:
+        log.info("The sub-processes are already terminated: %s" % e)
+        return False
+
+    log.info("Waiting for process to terminate due to SIGTERM")
+
+    # Escalate to SIGKILL if SIGTERM is not sufficient.
+    if not self._exited.wait(timeout=timeout):
+      with self._lock:
+        try:
+          log.warn("Killing process group %s which failed to terminate cleanly within %s secs" %
+                   (self._popen.pid, timeout))
+          os.killpg(self._popen.pid, signal.SIGKILL)
+        except OSError as e:
+          log.info("The sub-processes are already terminated: %s" % e)
+          return False
+
+    log.info("Waiting for process to terminate due to SIGKILL")
+    if not self._exited.wait(timeout=timeout):
+      raise TaskError("Failed to kill process group %s" % self._popen.pid)
+
+    return True
+
+  def get_log_position(self):
+    """
+      Get the log position of the MySQL slave. Return None if it cannot be obtained.
+    """
+    try:
+      log_position = self._task_control.get_log_position(env=self._env)
+      return log_position
+    except CalledProcessError as e:
+      raise TaskError("Unable to get the slave's log position: %s" % e)
+
+  def join(self):
+    """
+      Wait for the runner to terminate.
+
+      :return: The return code of the subprocess. NOTE: A negative value -N indicates that the
+               child was terminated by signal N (on Unix).
+
+      :exception: The TaskError exception due to an error in task control operations.
+    """
+    # Using 'sys.maxint' makes this forever wait interruptible.
+    result = self._result.get(True, sys.maxint)
+    if isinstance(result, Exception):
+      raise result
+    else:
+      return result
+
+  # --- ClusterListener handlers. ---
+  def _on_promote(self):
+    self.promoted.set()
+    if not self._exited.is_set():
+      defer(self._promote)
+
+  def _promote(self):
+    try:
+      self._task_control.promote(env=self._env)
+    except CalledProcessError as e:
+      self._result.put(TaskError("Failed to promote the slave: %s" % e))
+      self.stop()
+
+  def _on_demote(self):
+    """
+      Executor shuts itself down when demoted.
+    """
+    self.demoted.set()
+
+    # Stop the runner asynchronously.
+    if not self._exited.is_set():
+      log.info("Shutting down runner because it is demoted.")
+      # Call stop() asynchronously because this callback is invoked from the Kazoo thread which we
+      # don't want to block.
+      defer(self.stop)
+
+  def _on_master_change(self, master):
+    self.master.put(master)
+    if not self._exited.is_set():
+      defer(lambda: self._reparent(master))
+
+  def _reparent(self, master):
+    try:
+      self._task_control.reparent(
+          master.service_endpoint.host,
+          master.service_endpoint.port,
+          env=self._env)
+    except CalledProcessError as e:
+      self._result.put(TaskError("Failed to reparent the slave: %s" % e))
+      self.stop()
diff --git a/twitter/mysos/executor/mysql_task_control.py b/twitter/mysos/executor/mysql_task_control.py
new file mode 100644
index 0000000..b4979a2
--- /dev/null
+++ b/twitter/mysos/executor/mysql_task_control.py
@@ -0,0 +1,212 @@
+import json
+import os
+import subprocess
+import threading
+
+from twitter.common import log
+from twitter.common.quantity import Amount, Data
+from twitter.mysos.common.decorators import synchronized
+
+from .sandbox import Sandbox
+from .task_control import TaskControl, TaskControlProvider
+
+import yaml
+
+
+MEM_FRACTION_FOR_BUFFER_POOL = 0.75
+
+
+class MySQLTaskControlProvider(TaskControlProvider):
+  """
+    The default implementation of MySQLTaskControlProvider.
+    There exist other implementations for testing purposes.
+  """
+
+  def from_task(self, task, sandbox):
+    data = json.loads(task.data)
+    task_mem = None
+    for resource in task.resources:
+      if resource.name == 'mem':
+        task_mem = resource.scalar.value
+        break
+
+    assert task_mem, "Task resources should always include 'mem'"
+
+    buffer_pool_size = int(
+        Amount(int(task_mem), Data.MB).as_(Data.BYTES) * MEM_FRACTION_FOR_BUFFER_POOL)
+    log.info("Allocating %s bytes of memory to MySQL buffer pool" % buffer_pool_size)
+
+    # TODO(jyx): Use an ephemeral sandbox for now. Will change when Mesos adds persistent resources
+    # support: MESOS-1554.
+    return MySQLTaskControl(
+        sandbox,
+        data['framework_user'],
+        data['host'],
+        data['port'],
+        data['cluster'],
+        data['cluster_user'],
+        data['cluster_password'],
+        data['server_id'],
+        data['admin_keypath'],
+        buffer_pool_size)
+
+
+class MySQLTaskControl(TaskControl):
+  def __init__(
+      self,
+      sandbox,
+      framework_user,
+      host,
+      port,
+      cluster_name,
+      cluster_user,
+      password,
+      server_id,
+      admin_keypath,
+      buffer_pool_size):
+    """
+      :param sandbox: The sandbox where all files of this Mysos executor instance reside.
+      :param framework_user: The Unix user this framework runs as.
+      :param host: The hostname of the host that runs the MySQL instance.
+      :param port: The port of the MySQL instance.
+      :param cluster_name: The name of the cluster.
+      :param cluster_user: The Unix account that mysqld will run as and also the MySQL username.
+      :param password: The MySQL password associated with 'cluster_user' in MySQL.
+      :param server_id: The ID that identifies the MySQL instance.
+      :param buffer_pool_size: For the 'innodb_buffer_pool_size' variable in MySQL options.
+    """
+    if not isinstance(sandbox, Sandbox):
+      raise TypeError("'sandbox' should be an instance of Sandbox")
+    self._sandbox = sandbox
+
+    self._framework_user = framework_user
+    self._host = host
+    self._port = port
+    self._cluster_name = cluster_name
+    self._cluster_user = cluster_user
+    self._password = password
+    self._server_id = server_id
+
+    if not isinstance(buffer_pool_size, int):
+      raise ValueError("'buffer_pool_size' should be an instance of int")
+
+    self._buffer_pool_size = buffer_pool_size
+
+    try:
+      with open(admin_keypath, "r") as f:
+        cred = yaml.load(f)
+      self._admin_username = cred["username"]
+      self._admin_password = cred["password"]
+      log.info("Loaded credentials for admin account %s" % self._admin_username)
+    except IOError as e:
+      raise ValueError("Unable to obtain admin credentials: %s" % e)
+    except (KeyError, yaml.YAMLError) as e:
+      raise ValueError("Invalid key file format %s" % e)
+
+    self._lock = threading.Lock()
+    self._process = None  # The singleton task process that launches mysqld.
+
+    self._scripts_dir = os.path.join(self._sandbox.bin, "mysql", "scripts")
+    if not os.path.isdir(self._scripts_dir):
+      raise TaskControl.Error("Scripts directory %s does not exist" % self._scripts_dir)
+
+    custom_conf_file = os.environ.get('MYSOS_DEFAULTS_FILE', None)
+    if custom_conf_file:
+      log.info("Using 'MYSOS_DEFAULTS_FILE': %s" % custom_conf_file)
+      self._conf_file = custom_conf_file.strip()
+    else:
+      self._conf_file = os.path.join(self._sandbox.bin, "mysql", "conf", "my.cnf")
+
+    if not os.path.isfile(self._conf_file):
+      raise TaskControl.Error("Option file %s does not exist" % self._conf_file)
+
+  @synchronized
+  def initialize(self, env):
+    command = "%(cmd)s %(framework_user)s %(data_dir)s %(conf_file)s" % dict(
+        cmd=os.path.join(self._scripts_dir, "mysos_install_db.sh"),
+        framework_user=self._framework_user,
+        data_dir=self._sandbox.mysql_data_dir,
+        conf_file=self._conf_file)
+    log.info("Executing command: %s" % command)
+    subprocess.check_call(command, shell=True, env=env)
+
+  @synchronized
+  def start(self, env=None):
+    if self._process:
+      log.warn("start() called when a running task subprocess already exists")
+      return
+
+    command = (
+        "%(cmd)s %(framework_user)s %(host)s %(port)s %(server_id)s %(data_dir)s %(log_dir)s "
+        "%(tmp_dir)s %(conf_file)s %(buffer_pool_size)s" % dict(
+            cmd=os.path.join(self._scripts_dir, "mysos_launch_mysqld.sh"),
+            framework_user=self._framework_user,
+            host=self._host,
+            port=self._port,
+            server_id=self._server_id,
+            data_dir=self._sandbox.mysql_data_dir,
+            log_dir=self._sandbox.mysql_log_dir,
+            tmp_dir=self._sandbox.mysql_tmp_dir,
+            conf_file=self._conf_file,
+            buffer_pool_size=self._buffer_pool_size))
+    log.info("Executing command: %s" % command)
+    self._process = subprocess.Popen(command, shell=True, env=env)
+
+    # There is a delay before mysqld becomes available to accept requests. Wait for it.
+    command = "%(cmd)s %(pid_file)s %(port)s %(timeout)s" % dict(
+        cmd=os.path.join(self._scripts_dir, "mysos_wait_for_mysqld.sh"),
+        pid_file=os.path.join(self._sandbox.mysql_log_dir, "mysqld.pid"),
+        port=self._port,
+        timeout=60)
+    log.info("Executing command: %s" % command)
+    subprocess.check_call(command, shell=True, env=env)
+
+    return self._process
+
+  @synchronized
+  def reparent(self, master_host, master_port, env=None):
+    command = ("%(cmd)s %(master_host)s %(master_port)s %(slave_host)s %(slave_port)s "
+        "%(admin_user)s %(admin_password)s" % dict(
+            cmd=os.path.join(self._scripts_dir, "mysos_reparent.sh"),
+            master_host=master_host,
+            master_port=master_port,
+            slave_host=self._host,
+            slave_port=self._port,
+            admin_user=self._admin_username,
+            admin_password=self._admin_password))
+
+    log.info("Executing command: %s" % command)
+    subprocess.check_call(command, shell=True, env=env)
+
+  @synchronized
+  def promote(self, env=None):
+    command = ("%(cmd)s %(host)s %(port)s %(cluster_user)s %(password)s %(admin_user)s "
+        "%(admin_password)s" % dict(
+            cmd=os.path.join(self._scripts_dir, "mysos_promote_master.sh"),
+            host=self._host,
+            port=self._port,
+            cluster_user=self._cluster_user,
+            password=self._password,
+            admin_user=self._admin_username,
+            admin_password=self._admin_password))
+
+    # TODO(jyx): Scrub the command log line to hide the password.
+    log.info("Executing command: %s" % command)
+    subprocess.check_call(command, shell=True, env=env)
+
+  @synchronized
+  def get_log_position(self, env=None):
+    command = '%(cmd)s %(host)s %(port)s' % dict(
+        cmd=os.path.join(self._scripts_dir, "mysos_log_position.sh"),
+        host=self._host,
+        port=self._port)
+
+    log.info("Executing command: %s" % command)
+    output = subprocess.check_output(command, shell=True, env=env).strip()
+
+    if len(output.split(',')) == 2:
+      log_file, log_position = output.split(',')  # log_file may be empty.
+      log.info('Obtained log position: %s ' % str((log_file, log_position)))
+      return log_file, log_position
+    else:
+      return None
diff --git a/twitter/mysos/executor/noop_installer.py b/twitter/mysos/executor/noop_installer.py
new file mode 100644
index 0000000..57bbae7
--- /dev/null
+++ b/twitter/mysos/executor/noop_installer.py
@@ -0,0 +1,18 @@
+from twitter.mysos.executor.installer import PackageInstaller, PackageInstallerProvider
+
+
+class NoopPackageInstaller(PackageInstaller):
+  """
+    An installer that doesn't actually install the package.
+
+    It can be used when the host has dependent packages (i.e. MySQL) pre-installed and its upgrades
+    managed externally.
+  """
+
+  def install(self):
+    return None  # No environment variables to pass along to the task sub-processes.
+
+
+class NoopPackageInstallerProvider(PackageInstallerProvider):
+  def from_task(self, task, sandbox):
+    return NoopPackageInstaller()
diff --git a/twitter/mysos/executor/sandbox.py b/twitter/mysos/executor/sandbox.py
new file mode 100644
index 0000000..60f1111
--- /dev/null
+++ b/twitter/mysos/executor/sandbox.py
@@ -0,0 +1,82 @@
+from os.path import isabs, join
+
+from twitter.common.dirutil import safe_mkdir
+
+
+class Sandbox(object):
+  """
+    Represents the structure of the Mysos executor sandbox:
+
+    sandbox_root/              # Sandbox for this Mysos instance.
+      bin/                     # Binaries, executables.
+        mysql/scripts/         # Mysos scripts (come with the executor).
+          mysos_install_db.sh
+          ...
+      lib/                     # Libraries installed by the installer.
+      var/                     # For Mysos (and MySQL) to save its state ('datadir', 'tmpdir', etc).
+        mysql/                 # The sandbox maintains and exposes some standard mysql directories.
+          data/
+          tmp/
+          logs/
+  """
+
+  def __init__(self, root):
+    """
+      Initializes the sandbox.
+
+      :param root: Root path of the sandbox.
+
+      The sandbox makes sure that the folder paths it exposes as properties are created.
+    """
+    if not isabs(root):
+      raise ValueError("Only an absolute path is allowed for 'root")
+
+    self._root = root
+
+    safe_mkdir(self.bin)
+    safe_mkdir(self.lib)
+    safe_mkdir(self.var)
+    safe_mkdir(self.mysql_var)
+    safe_mkdir(self.mysql_data_dir)
+    safe_mkdir(self.mysql_tmp_dir)
+    safe_mkdir(self.mysql_log_dir)
+
+  @property
+  def root(self):
+    """Root path of the sandbox."""
+    return self._root
+
+  @property
+  def bin(self):
+    """For Mysos binaries."""
+    return join(self._root, "bin")
+
+  @property
+  def lib(self):
+    """For libraries that the Mysos executor replies on."""
+    return join(self._root, "lib")
+
+  @property
+  def var(self):
+    """For the Mysos executor's application data."""
+    return join(self._root, "var")
+
+  @property
+  def mysql_var(self):
+    """For mysql related data files."""
+    return join(self.var, 'mysql')
+
+  @property
+  def mysql_data_dir(self):
+    return join(self.mysql_var, 'data')
+
+  @property
+  def mysql_tmp_dir(self):
+    return join(self.mysql_var, 'tmp')
+
+  @property
+  def mysql_log_dir(self):
+    return join(self.mysql_var, 'logs')
+
+  def __str__(self):
+    return self._root
diff --git a/twitter/mysos/executor/shell_utils.py b/twitter/mysos/executor/shell_utils.py
new file mode 100644
index 0000000..bed9ddc
--- /dev/null
+++ b/twitter/mysos/executor/shell_utils.py
@@ -0,0 +1,122 @@
+"""Set of utility functions for working with OS commands.
+
+Functions in this module return the command string. These commands are composed but not executed.
+"""
+
+import os
+from subprocess import call
+
+
+HADOOP_CONF_DIR = '/etc/hadoop/conf'
+
+
+def encrypt(key_file):
+  """
+    Encrypt the data from stdin and write output to stdout.
+
+    :param key_file: The key file used to encrypt the stream.
+  """
+  if not os.path.isfile(key_file):
+    raise ValueError("Cannot find key_file: %" % key_file)
+
+  return "openssl aes-256-cbc -salt -pass file:%s" % key_file
+
+
+def decrypt(key_file):
+  """
+    Decrypt the data from stdin and write output to stdout.
+
+    :param key_file: The key file used to decrypt the stream.
+  """
+  if not os.path.isfile(key_file):
+    raise ValueError("Cannot find key_file: %" % key_file)
+
+  return "openssl aes-256-cbc -d -pass file:%s" % key_file
+
+
+def compress(extension):
+  """
+    Compress the data from stdin and write output to stdout.
+    :param extension: The compression format identified by the file extension. Allowed values are:
+                      'gz' for gzip, 'bz' or 'bz2' for bzip.
+  """
+  if extension == "gz":
+    cmd = "pigz" if exists("pigz") else "gzip"
+  elif extension == "bz" or extension == "bz2":
+    cmd = "bzip2"
+  elif extension == 'lzo':
+    cmd = "lzop"
+  else:
+    raise ValueError("Unknown compression format/file extension")
+
+  return cmd
+
+
+def decompress(extension):
+  """
+    Decompress the data from stdin and write output to stdout.
+
+    :param extension: The compression format identified by the file extension. Allowed values are:
+                      'gz' for gzip, 'bz' or 'bz2' for bzip.
+  """
+  if extension == "gz":
+    cmd = "pigz -d" if exists("pigz") else "gzip -d"
+  elif extension == "bz" or extension == "bz2":
+    cmd = "bzip2 -d"
+  elif extension == 'lzo':
+    cmd = "lzop -d"
+  else:
+    raise ValueError("Unknown compression format/file extension")
+
+  return cmd
+
+
+def hdfs_cat(uri, conf=HADOOP_CONF_DIR):
+  """
+    Fetch the data from the specified uri and write output to stdout.
+
+    :param uri: The HDFS URI.
+    :param conf: The hadoop config directory.
+  """
+  return "hadoop --config %s dfs -cat %s" % (conf, uri)
+
+
+def pv(size):
+  """
+    Monitor the progress of data through a pipe. If 'pv' is not available, simply 'cat' it.
+
+    :param size: The size of the data, to calculate percentage.
+  """
+  if exists('pv'):
+    return "pv --wait --size %s" % size
+  else:
+    return "cat"
+
+
+def untar(directory):
+  """
+    Untar the data from stdin into the specified directory.
+
+    :param directory: The directory to write files to.
+  """
+  return "tar -C %s -x" % directory
+
+
+def tar(path):
+  """
+    Tar the path and write output to stdout.
+
+    :param path: All contents under path are 'tar'ed.
+  """
+  if not os.path.exists(path):
+    raise ValueError("Invalid argument: 'path' doesn't exist")
+
+  path = path.rstrip(os.sep)
+  parent, base = os.path.split(path)
+  return "tar -C %s %s" % (parent, base)
+
+
+def exists(cmd):
+  """Return true if 'cmd' exists in $PATH."""
+  with open(os.devnull, "w") as f:
+    return call(['which', cmd], stdout=f) == 0  # No stdout.
diff --git a/twitter/mysos/executor/state.py b/twitter/mysos/executor/state.py
new file mode 100644
index 0000000..eff4ffe
--- /dev/null
+++ b/twitter/mysos/executor/state.py
@@ -0,0 +1,67 @@
+import os
+import json
+import subprocess
+
+from twitter.common import log
+
+from .backup import BackupStore
+
+
+BACKUP_INFO_FILENAME = "backup_info.json"
+
+
+class StateManager(object):
+  """
+    Responsible for managing (restoring, initializing) the executor state.
+
+    TODO(jyx): Will also periodically back up the state.
+  """
+
+  class Error(Exception): pass
+
+  def __init__(self, sandbox, backup_store):
+    """
+      :param sandbox: The sandbox.
+      :param backup_store: The BackupStore implementation.
+    """
+    self._sandbox = sandbox
+    self._backup_store = backup_store
+
+  def bootstrap(self, task_control, env):
+    """
+      Bootstraps the executor state.
+
+      :param task_control: Task control for carrying out state bootstrapping commands.
+      :param env: The environment variables for task_control methods.
+    """
+
+    # 1. Directly return if the data folder is not empty.
+    if os.listdir(self._sandbox.mysql_data_dir):
+      # TODO(jyx): This will be expected when we use persistent volumes. Validate the state in that
+      # case.
+      log.warn("MySQL state already exists unexpectedly. Finishing bootstrap without restoration "
+               "or initialization")
+      return
+
+    # 2. If the data folder is clean, restore state from the backup store. This can be a noop if the
+    # user doesn't want to restore any state.
+    try:
+      backup_info = self._backup_store.restore()
+    except BackupStore.Error as e:
+      raise self.Error("Failed to restore MySQL state: %s" % e)
+
+    if backup_info:
+      # If some backup is restored, persist the backup info.
+      log.info("Finished restoring the backup")
+      backup_info_file = os.path.join(self._sandbox.var, BACKUP_INFO_FILENAME)
+      # Useful for the user to check the result of backup restore.
+      with open(backup_info_file, 'w') as f:
+        json.dump(backup_info.__dict__, f)
+      log.info("Persisted backup info '%s' to file %s" % (backup_info.__dict__, backup_info_file))
+    else:
+      # If no recovery necessary, initialize the data dirs.
+      log.info("No MySQL backup is restored. Initializing a new MySQL instance")
+      try:
+        task_control.initialize(env)
+      except subprocess.CalledProcessError as e:
+        raise self.Error("Unable to initialize MySQL state: %s" % e)
diff --git a/twitter/mysos/executor/task_control.py b/twitter/mysos/executor/task_control.py
new file mode 100644
index 0000000..73e42ef
--- /dev/null
+++ b/twitter/mysos/executor/task_control.py
@@ -0,0 +1,72 @@
+from abc import abstractmethod
+
+from twitter.common.lang import Interface
+
+
+class TaskControlProvider(Interface):
+  @abstractmethod
+  def from_task(self, task, sandbox):
+    pass
+
+
+class TaskControl(Interface):
+  """
+    This class encapsulates commands that control the MySQL task process.
+
+    Implementation NOTEs:
+    1. These commands (methods) should run serially when accessed from multiple
+       threads.
+    2. This class doesn't capture subprocess.CalledProcessErrors thrown when underlying MySQL
+       commands exit with a non-zero return code. The caller should handle it.
+  """
+
+  class Error(Exception):
+    pass
+
+  @abstractmethod
+  def initialize(self, env):
+    """
+      Initialize a new DB instance.
+
+      :param env: The 'env' necessary for 'subprocess' to run the command.
+    """
+    pass
+
+  @abstractmethod
+  def start(self, env=None):
+    """
+    Start the task in a subprocess.
+
+    :param env: The 'env' necessary for 'subprocess' to run the command.
+    :return: A subprocess.Popen object that represents the leader of the process group that executes
+             the task.
+  """
+    pass
+
+  @abstractmethod
+  def reparent(self, master_host, master_port, env=None):
+    """
+      Reparent the MySQL slave to the new master.
+
+      :param env: The 'env' necessary for 'subprocess' to run the command.
+    """
+    pass
+
+  @abstractmethod
+  def promote(self, env=None):
+    """
+      Promote a slave to mastership.
+
+      :param env: The 'env' necessary for 'subprocess' to run the command.
+    """
+    pass
+
+  @abstractmethod
+  def get_log_position(self, env=None):
+    """
+      Retrieve the log position from mysqld.
+
+      :param env: The 'env' necessary for 'subprocess' to run the command.
+      :return: The log position, None if it cannot be obtained.
+    """
+    pass
diff --git a/twitter/mysos/executor/task_runner.py b/twitter/mysos/executor/task_runner.py
new file mode 100644
index 0000000..d834e6c
--- /dev/null
+++ b/twitter/mysos/executor/task_runner.py
@@ -0,0 +1,20 @@
+from abc import abstractmethod
+
+from twitter.common.lang import Interface
+
+
+class TaskError(Exception):
+  pass
+
+
+class TaskRunner(Interface):
+  pass
+
+
+class TaskRunnerProvider(Interface):
+  @abstractmethod
+  def from_task(self, task, sandbox):
+    """
+      Factory method that creates a TaskRunner instance from 'task' (TaskInfo).
+    """
+    pass
diff --git a/twitter/mysos/executor/testing/__init__.py b/twitter/mysos/executor/testing/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/twitter/mysos/executor/testing/__init__.py
diff --git a/twitter/mysos/executor/testing/fake.py b/twitter/mysos/executor/testing/fake.py
new file mode 100644
index 0000000..863cbaf
--- /dev/null
+++ b/twitter/mysos/executor/testing/fake.py
@@ -0,0 +1,70 @@
+"""This module is for all fake implementations of things in Mysos executor for testing."""
+
+import os
+import random
+import subprocess
+import threading
+
+from twitter.mysos.common.decorators import synchronized
+from twitter.mysos.executor.task_control import TaskControl, TaskControlProvider
+
+
+class FakeTaskControlProvider(TaskControlProvider):
+  """
+    An implementation of TaskControlProvider for testing.
+  """
+
+  def from_task(self, task, sandbox):
+    return FakeTaskControl(position=random.randint(0, 100))
+
+
+class FakeTaskControl(TaskControl):
+  def __init__(
+      self,
+      mysqld="tail -f /dev/null",
+      initialize_cmd=":",
+      start_cmd=":",
+      reparent_cmd=":",
+      promote_cmd=":",
+      get_log_position_cmd=":",
+      position=1):
+    """
+      :param mysqld: The command that 'simulates' mysqld (and does nothing).
+      :param *_cmd: The commands that are executed for the respective FakeTaskControl operations.
+      :param position: The 'mysqld' log position to return as the result of get_log_position().
+    """
+    self._lock = threading.Lock()
+    self._mysqld = mysqld
+    self._initialize_cmd = initialize_cmd
+    self._start_cmd = start_cmd,
+    self._reparent_cmd = reparent_cmd,
+    self._promote_cmd = promote_cmd,
+    self._get_log_position_cmd = get_log_position_cmd
+    self._position = position
+    self._process = None
+
+  @synchronized
+  def initialize(self, env):
+    subprocess.check_call(self._initialize_cmd, shell=True)
+
+  @synchronized
+  def start(self, env=None):
+    if self._process:
+      return
+
+    self._process = subprocess.Popen(self._mysqld, shell=True, preexec_fn=os.setsid)
+    subprocess.check_call(self._start_cmd, shell=True)
+    return self._process
+
+  @synchronized
+  def reparent(self, master_host, master_port, env=None):
+    subprocess.check_call(self._reparent_cmd, shell=True)
+
+  @synchronized
+  def promote(self, env=None):
+    subprocess.check_call(self._promote_cmd, shell=True)
+
+  @synchronized
+  def get_log_position(self, env=None):
+    subprocess.check_call(self._get_log_position_cmd, shell=True)
+    return self._position
diff --git a/twitter/mysos/executor/testing/fake_mysos_executor.py b/twitter/mysos/executor/testing/fake_mysos_executor.py
new file mode 100644
index 0000000..53e1ed7
--- /dev/null
+++ b/twitter/mysos/executor/testing/fake_mysos_executor.py
@@ -0,0 +1,71 @@
+import json
+import os
+import posixpath
+import socket
+
+from twitter.common import app, log
+from twitter.common.log.options import LogOptions
+from twitter.common.zookeeper.serverset.endpoint import Endpoint, ServiceInstance
+from twitter.mysos.common import zookeeper
+from twitter.mysos.common.testing import Fake
+from twitter.mysos.executor.executor import MysosExecutor
+from twitter.mysos.executor.mysos_task_runner import MysosTaskRunner, TaskRunnerProvider
+from twitter.mysos.executor.noop_installer import NoopPackageInstaller
+from twitter.mysos.executor.sandbox import Sandbox
+
+from .fake import FakeTaskControlProvider
+
+import mesos.native
+from zake.fake_client import FakeClient
+
+
+SANDBOX_ROOT = os.path.join(os.path.realpath('.'), "sandbox")
+
+
+class FakeTaskRunnerProvider(TaskRunnerProvider):
+  """
+    Creates a MysosTaskRunner with FakeTaskControl for testing purposes.
+    NOTE: zake is used so a running ZK server is not required.
+  """
+
+  def __init__(self, task_control_provider):
+    self._task_control_provider = task_control_provider
+
+  def from_task(self, task, sandbox):
+    data = json.loads(task.data)
+    cluster_name, port, zk_url = data['cluster'], data['port'], data['zk_url']
+
+    _, servers, path = zookeeper.parse(zk_url)
+
+    zk_client = FakeClient()
+    zk_client.start()
+    self_instance = ServiceInstance(Endpoint(socket.gethostbyname(socket.gethostname()), port))
+    task_control = self._task_control_provider.from_task(task, sandbox)
+
+    return MysosTaskRunner(
+        self_instance,
+        zk_client,
+        posixpath.join(path, cluster_name),
+        NoopPackageInstaller(),
+        task_control,
+        Fake())
+
+
+# This is a testing executor. We log more verbosely.
+LogOptions.disable_disk_logging()
+LogOptions.set_stderr_log_level('google:DEBUG')
+
+
+def proxy_main():
+  def main(args, options):
+    log.info('Starting testing mysos executor')
+
+    executor = MysosExecutor(
+        FakeTaskRunnerProvider(FakeTaskControlProvider()), Sandbox(SANDBOX_ROOT))
+
+    driver = mesos.native.MesosExecutorDriver(executor)
+    driver.run()
+
+    log.info('Exiting executor main')
+
+  app.main()
diff --git a/twitter/mysos/executor/testing/vagrant_mysos_executor.py b/twitter/mysos/executor/testing/vagrant_mysos_executor.py
new file mode 100644
index 0000000..97f307b
--- /dev/null
+++ b/twitter/mysos/executor/testing/vagrant_mysos_executor.py
@@ -0,0 +1,58 @@
+"""This 'testing' executor is built to be run in the vagrant VM.
+
+It is basically the same as the normal Mysos executor except that it doesn't rely on HDFS.
+"""
+
+import os
+import stat
+
+from twitter.common import app, log
+from twitter.common.log.options import LogOptions
+from twitter.mysos.common.pkgutil import unpack_assets
+from twitter.mysos.executor.mysql_task_control import MySQLTaskControlProvider
+from twitter.mysos.executor.executor import MysosExecutor
+from twitter.mysos.executor.mysos_task_runner import MysosTaskRunnerProvider
+from twitter.mysos.executor.noop_installer import NoopPackageInstallerProvider
+from twitter.mysos.executor.sandbox import Sandbox
+from twitter.mysos.executor.backup import NoopBackupStoreProvider
+
+import mesos.native
+
+
+MYSOS_MODULE = 'twitter.mysos.executor'
+ASSET_RELPATH = 'files'
+
+
+def chmod_scripts(path):
+  """Make scripts executable."""
+  if path.endswith('.sh'):
+    st = os.stat(path)
+    os.chmod(path, st.st_mode | stat.S_IEXEC)
+
+
+LogOptions.disable_disk_logging()
+LogOptions.set_stderr_log_level('google:INFO')
+
+
+def proxy_main():
+  def main(args, options):
+    # 'sandbox' directory resides under the working directory assigned by the Mesos slave.
+    sandbox_root = os.path.join(os.path.realpath('.'), "sandbox")
+
+    unpack_assets(sandbox_root, MYSOS_MODULE, ASSET_RELPATH, execute=chmod_scripts)
+
+    log.info("Starting Vagrant Mysos executor within sandbox %s" % sandbox_root)
+
+    sandbox = Sandbox(sandbox_root)
+    executor = MysosExecutor(
+        MysosTaskRunnerProvider(
+            MySQLTaskControlProvider(),
+            NoopPackageInstallerProvider(),  # Do not install any package.
+            NoopBackupStoreProvider()),  # Do not recover any state.
+        sandbox)
+    driver = mesos.native.MesosExecutorDriver(executor)
+    driver.run()
+
+    log.info('Exiting executor main')
+
+  app.main()
\ No newline at end of file
diff --git a/twitter/mysos/scheduler/__init__.py b/twitter/mysos/scheduler/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/twitter/mysos/scheduler/__init__.py
diff --git a/twitter/mysos/scheduler/assets/static/bootstrap.min.css b/twitter/mysos/scheduler/assets/static/bootstrap.min.css
new file mode 100644
index 0000000..28f154d
--- /dev/null
+++ b/twitter/mysos/scheduler/assets/static/bootstrap.min.css
@@ -0,0 +1,5 @@
+/*!
+ * Bootstrap v3.3.2 (http://getbootstrap.com)
+ * Copyright 2011-2015 Twitter, Inc.
+ * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
+ *//*! normalize.css v3.0.2 | MIT License | git.io/normalize */html{font-family:sans-serif;-webkit-text-size-adjust:100%;-ms-text-size-adjust:100%}body{margin:0}article,aside,details,figcaption,figure,footer,header,hgroup,main,menu,nav,section,summary{display:block}audio,canvas,progress,video{display:inline-block;vertical-align:baseline}audio:not([controls]){display:none;height:0}[hidden],template{display:none}a{background-color:transparent}a:active,a:hover{outline:0}abbr[title]{border-bottom:1px dotted}b,strong{font-weight:700}dfn{font-style:italic}h1{margin:.67em 0;font-size:2em}mark{color:#000;background:#ff0}small{font-size:80%}sub,sup{position:relative;font-size:75%;line-height:0;vertical-align:baseline}sup{top:-.5em}sub{bottom:-.25em}img{border:0}svg:not(:root){overflow:hidden}figure{margin:1em 40px}hr{height:0;-webkit-box-sizing:content-box;-moz-box-sizing:content-box;box-sizing:content-box}pre{overflow:auto}code,kbd,pre,samp{font-family:monospace,monospace;font-size:1em}button,input,optgroup,select,textarea{margin:0;font:inherit;color:inherit}button{overflow:visible}button,select{text-transform:none}button,html input[type=button],input[type=reset],input[type=submit]{-webkit-appearance:button;cursor:pointer}button[disabled],html input[disabled]{cursor:default}button::-moz-focus-inner,input::-moz-focus-inner{padding:0;border:0}input{line-height:normal}input[type=checkbox],input[type=radio]{-webkit-box-sizing:border-box;-moz-box-sizing:border-box;box-sizing:border-box;padding:0}input[type=number]::-webkit-inner-spin-button,input[type=number]::-webkit-outer-spin-button{height:auto}input[type=search]{-webkit-box-sizing:content-box;-moz-box-sizing:content-box;box-sizing:content-box;-webkit-appearance:textfield}input[type=search]::-webkit-search-cancel-button,input[type=search]::-webkit-search-decoration{-webkit-appearance:none}fieldset{padding:.35em .625em .75em;margin:0 2px;border:1px solid silver}legend{padding:0;border:0}textarea{overflow:auto}optgroup{font-weight:700}table{border-spacing:0;border-collapse:collapse}td,th{padding:0}/*! 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new file mode 100644
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diff --git a/twitter/mysos/scheduler/assets/templates/clusters.html b/twitter/mysos/scheduler/assets/templates/clusters.html
new file mode 100644
index 0000000..903893e
--- /dev/null
+++ b/twitter/mysos/scheduler/assets/templates/clusters.html
@@ -0,0 +1,67 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <title>Mysos Clusters</title>
+  <meta http-equiv="refresh" content="300">
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <link rel="stylesheet" href="/static/bootstrap.min.css">
+  <style>
+    body {
+      padding-top: 50px;
+    }
+
+    tr.cluster {
+      cursor: pointer;
+    }
+  </style>
+</head>
+<body>
+<div class="navbar navbar-default navbar-fixed-top" role="navigation">
+  <div class="container">
+    <div class="navbar-header">
+      <button type="button" class="navbar-toggle" data-toggle="collapse"
+              data-target="#navbar-collapse">
+        <span class="sr-only">Toggle navigation</span>
+        <span class="icon-bar"></span>
+      </button>
+      <a class="navbar-brand" href="/">Mysos</a>
+    </div>
+
+    <!-- Collect the nav links, forms, and other content for toggling -->
+    <div class="collapse navbar-collapse" id="navbar-collapse">
+      <ul class="nav navbar-nav">
+        <li class="active"><a href="/">Clusters</a></li>
+      </ul>
+    </div>
+    <!-- /.navbar-collapse -->
+  </div>
+  <!-- /.container -->
+</div>
+
+<div class="container">
+  <h1>Clusters</h1>
+  <!-- TODO: ajax -->
+  <table class="table table-hover">
+    <thead>
+    <tr>
+      <th>name</th>
+      <th>user</th>
+      <th>num nodes</th>
+    </tr>
+    </thead>
+    <tbody>
+    %for cluster in clusters:
+    <tr class="cluster">
+      <td>${cluster.name}</td>
+      <td>${cluster.user}</td>
+      <td>${cluster.num_nodes}</td>
+    </tr>
+    %endfor
+    </tbody>
+  </table>
+</div>
+<!-- container -->
+<script src="/static/jquery.min.js"></script>
+<script src="/static/bootstrap.min.js"></script>
+</body>
+</html>
diff --git a/twitter/mysos/scheduler/elector.py b/twitter/mysos/scheduler/elector.py
new file mode 100644
index 0000000..cc80d90
--- /dev/null
+++ b/twitter/mysos/scheduler/elector.py
@@ -0,0 +1,247 @@
+from collections import OrderedDict
+from datetime import datetime, timedelta
+import threading
+
+from twitter.common import log
+from twitter.common.exceptions import ExceptionalThread
+from twitter.common.quantity import Amount, Time
+
+import mesos.interface.mesos_pb2 as mesos_pb2
+
+
+class MySQLMasterElector(ExceptionalThread):
+  """
+    Elect the most current slave in the cluster to be the new master.
+
+    The current election algorithm:
+      The elector queries slaves periodically (to tolerate message loss) until all slaves have
+      responded with their current positions and the slave with the highest (most current)
+      position is elected the new master. If the election timeout has passed and not all slaves have
+      responded, the master is elected from the ones that have.
+
+    Thread-safety:
+      The elector runs as a separate thread and it periodically queries the slaves util the election
+      completes or is aborted. Its public methods are thread-safe.
+
+    Usage:
+      After constructing the elector, add all currently known candidates of the election through
+      'elector.add_slave()' before calling 'elector.start()' to make sure it waits for all of them.
+
+    NOTE: An elector is not reusable. To restart the election, create another MySQLMasterElector
+    instance.
+  """
+
+  def __init__(
+      self,
+      driver,
+      cluster_name,
+      epoch,
+      master_callback,
+      election_timeout,
+      query_interval=Amount(1, Time.SECONDS)):
+    """
+      :param driver: The SchedulerDriver for querying the slaves.
+      :param cluster_name: The name of the MySQL cluster.
+      :param epoch: The master epoch that identifies this election.
+      :param master_callback: The callback function with one argument: the 'task_id' of the elected
+                              master which could be None if no one is electable.
+      :param election_timeout: The amount of time the elector waits for all slaves to respond. If
+                               not all slaves have responded within the timeout, then the master is
+                               elected from the ones who have.
+      :param query_interval: The timeout before the elector re-sends queries for positions.
+
+      :type epoch: int
+      :type query_interval: Amount
+      :type election_timeout: Amount
+      :type master_callback: function
+    """
+    super(MySQLMasterElector, self).__init__()
+
+    if not isinstance(epoch, int):
+      raise TypeError("'epoch' should be an int")
+    if not isinstance(query_interval, Amount) or not isinstance(query_interval.unit(), Time):
+      raise ValueError("'query_interval' must be an Amount of Time")
+    if not isinstance(election_timeout, Amount) or not isinstance(election_timeout.unit(), Time):
+      raise ValueError("'election_timeout' must be an Amount of Time")
+    if not hasattr(master_callback, '__call__'):
+      raise TypeError("master_callback must be a function")
+
+    self._query_interval = query_interval.as_(Time.SECONDS)
+
+    self._election_deadline = (
+        datetime.utcnow() + timedelta(seconds=election_timeout.as_(Time.SECONDS)))
+
+    self._driver = driver
+    self._cluster_name = cluster_name  # For logging.
+    self._epoch = epoch
+    self._master_callback = master_callback
+
+    self._positions = OrderedDict()  # Slave {Task ID: Position} mappings. Use OrderedDict so we can
+                                     # easily locate the first added slave.
+    self._mesos_slaves = {}  # Slave {Task ID, Mesos slave ID)} mappings.
+    self._master = None  # Elected master (its TaskID); initially None and can still be None after
+                         # the election has timed out and there are no slaves to elect from.
+
+    self._lock = threading.Lock()
+    self._aborted = threading.Event()  # Elector thread aborted (don't invoke callback).
+    self._completed = threading.Event()  # Election process completed (invoke callback).
+
+  def add_slave(self, task_id, mesos_slave_id):
+    """
+      Add a new MySQL slave (Task ID, Mesos Slave ID) which could affect the ongoing election.
+    """
+    with self._lock:
+      if self._completed.is_set():
+        log.debug("Ignoring addition of slave %s because the election has completed" % task_id)
+        return
+
+      log.info('Adding slave %s to the election for cluster %s' % (
+          str((task_id, mesos_slave_id)),
+          self._cluster_name))
+
+      self._positions[task_id] = None
+      self._mesos_slaves[task_id] = mesos_slave_id
+
+  def remove_slave(self, task_id):
+    """
+      Remove a slave from the election process.
+    """
+    with self._lock:
+      if self._completed.is_set():
+        log.debug("Ignoring removal of slave %s because the election has completed" % task_id)
+        return
+
+      log.info('Removing slave %s from election for cluster %s' % (
+          str((task_id, self._mesos_slaves[task_id])), self._cluster_name))
+
+      assert task_id in self._positions
+      assert task_id in self._mesos_slaves
+      del self._positions[task_id]
+      del self._mesos_slaves[task_id]
+
+  def update_position(self, epoch, task_id, position):
+    """
+      Called by the launcher upon receiving the executor's response to position query.
+
+      :type epoch: int
+      :param epoch: The master epoch this position is for.
+      :param position: The position of the slave's log (not necessarily numeric). The elector
+                       doesn't care about its exact format as long as it is comparable.
+    """
+    if not isinstance(epoch, int):
+      raise TypeError("'epoch' should be an int")
+
+    with self._lock:
+      if self._completed.is_set():
+        log.debug("Ignoring position %s from slave %s because the election has completed" % (
+            position, task_id))
+        return
+
+      if epoch != self._epoch:
+        log.info(
+            "Ignoring position %s from slave %s due to epoch mismatch: (expected: %s, actual: %s)" %
+            (position, task_id, self._epoch, epoch))
+        return
+
+      if task_id not in self._mesos_slaves:
+        log.warn("Ignoring unsolicited position response %s from MySQL slave %s" % (
+            str(position), task_id))
+        return
+
+      log.info('Updating position to %s (epoch=%s) for slave %s of cluster %s' % (
+          str(position),
+          epoch,
+          str((task_id, self._mesos_slaves[task_id])),
+          self._cluster_name))
+
+      self._positions[task_id] = position
+
+  def run(self):
+    # Re-run the election in a loop periodically until a master can be elected or the elector is
+    # aborted.
+    while not self._aborted.is_set() and not self._completed.wait(self._query_interval):
+      if datetime.utcnow() < self._election_deadline:
+        self._elect(timedout=False)
+      else:
+        log.info("Timed out waiting for all slaves to respond. Now elect from existing responses")
+        self._elect(timedout=True)
+        if not self._completed.is_set():
+          log.warn("No slave is electable after timeout")
+
+    if self._aborted.is_set():  # If asked to stop, directly return without triggering the callback.
+      log.info("Asked to stop the elector thread for cluster %s. Stopping..." % self._cluster_name)
+      return
+
+    self._master_callback(self._master)  # Invoke the callback from the elector thread.
+    log.info("Stopping the elector thread for cluster %s because the election has completed" %
+        self._cluster_name)
+
+  def _elect(self, timedout=False):
+    """
+      Try to elect the master from MySQL slaves.
+
+      Elect the slave with the highest position if all slaves have responded, otherwise re-query the
+      remaining slaves for log positions (unless 'timedout' is True).
+
+      :param timedout: If True, just elect the slave with the highest position from the ones who
+                       have responded.
+
+      NOTE: If 'timedout' is True and no slaves have responded (but there are running slaves in
+      the cluster), theoretically we can still randomly elect one from them but currently we don't
+      as this would suggest some major issues with the MySQL or Mesos cluster and it's dangerous to
+      do so.
+    """
+    with self._lock:
+      # Special-casing the first epoch because this is when the cluster first starts and every
+      # slave should be the same: just pick the first slave that comes up.
+      if self._epoch == 0 and len(self._positions) > 0:
+        self._master = next(iter(self._positions))
+        self._completed.set()
+        return
+
+      if timedout or (self._positions and _all(self._positions.values())):
+        # Pick the slave with the highest position (value of the key-value pair). If all items have
+        # the same value, an arbitrary (but deterministic) one is chosen.
+        if _any(self._positions.values()):  # Need at least one position.
+          master_task, _ = max(self._positions.items(), key=lambda kv: kv[1])
+          log.info('Elected master %s for cluster %s' % (master_task, self._cluster_name))
+          self._master = master_task
+          self._completed.set()
+      else:
+        # (Re)query the remaining slaves for log positions.
+        for task_id in self._positions:
+          if not self._positions[task_id]:
+            self._query_slave(task_id)
+
+  def _query_slave(self, task_id):
+    assert task_id in self._mesos_slaves
+
+    log.info('Querying MySQL slave %s for its log position (epoch=%s)' % (
+        str((task_id, self._mesos_slaves[task_id])), self._epoch))
+
+    # Because the elector re-sends messages, it's necessary to use the epoch to differentiate
+    # responses for each election.
+    self._driver.sendFrameworkMessage(
+        mesos_pb2.ExecutorID(value=task_id),
+        mesos_pb2.SlaveID(value=self._mesos_slaves[task_id]),
+        str(self._epoch))  # Send the slave the epoch so it can be included in the response.
+
+  def abort(self):
+    """Stop the elector thread."""
+    self._aborted.set()
+
+
+def _all(iterable):
+  """Same as built-in version of all() except it explicitly checks if an element "is None"."""
+  for element in iterable:
+    if element is None:
+      return False
+  return True
+
+
+def _any(iterable):
+  """Same as built-in version of any() except it explicitly checks if an element "is not None"."""
+  for element in iterable:
+    if element is not None:
+      return True
+  return False
diff --git a/twitter/mysos/scheduler/http.py b/twitter/mysos/scheduler/http.py
new file mode 100644
index 0000000..e2a0636
--- /dev/null
+++ b/twitter/mysos/scheduler/http.py
@@ -0,0 +1,74 @@
+import json
+import os
+
+from twitter.common.http import HttpServer, route, static_file
+
+from .launcher import MySQLClusterLauncher
+from .scheduler import MysosScheduler
+
+import bottle
+from mako.template import Template
+
+
+class MysosServer(HttpServer):
+  def __init__(self, scheduler, asset_dir):
+    super(MysosServer, self).__init__()
+    self._scheduler = scheduler
+    self._asset_dir = asset_dir
+
+    self._static_dir = os.path.join(self._asset_dir, 'static')
+    self._template_dir = os.path.join(self._asset_dir, 'templates')
+
+    self._clusters_template = Template(filename=os.path.join(self._template_dir, 'clusters.html'))
+
+  @route('/clusters/<clustername>', method=['POST'])
+  def create(self, clustername):
+    """Create a db cluster."""
+    cluster_name = clustername  # For naming consistency.
+    num_nodes = bottle.request.forms.get('num_nodes', default=3)
+    cluster_user = bottle.request.forms.get('cluster_user', default=None)
+    backup_id = bottle.request.forms.get('backup_id', default=None)
+
+    try:
+      cluster_zk_url, cluster_password = self._scheduler.create_cluster(
+          cluster_name,
+          cluster_user,
+          num_nodes,
+          backup_id=backup_id)
+      return json.dumps(dict(cluster_url=cluster_zk_url, cluster_password=cluster_password))
+    except MysosScheduler.ClusterExists as e:
+      raise bottle.HTTPResponse(e.message, status=409)
+    except MysosScheduler.InvalidUser as e:
+      raise bottle.HTTPResponse(e.message, status=400)
+    except MysosScheduler.ServiceUnavailable as e:
+      raise bottle.HTTPResponse(e.message, status=503)
+    except ValueError as e:
+      raise bottle.HTTPResponse(e.message, status=400)
+
+
+  @route('/clusters/<clustername>', method=['DELETE'])
+  def remove(self, clustername):
+    """Remove a db cluster."""
+    cluster_name = clustername  # For naming consistency.
+
+    password = bottle.request.forms.get('password', default=None)
+
+    try:
+      cluster_zk_url = self._scheduler.delete_cluster(cluster_name, password)
+      return json.dumps(dict(cluster_url=cluster_zk_url))
+    except MysosScheduler.ClusterNotFound as e:
+      raise bottle.HTTPResponse(e.message, status=404)
+    except MySQLClusterLauncher.PermissionError as e:
+      raise bottle.HTTPResponse(e.message, status=403)
+
+  @route('/', method=['GET'])
+  def clusters(self):
+    """Landing page, showing the list of managed clusters."""
+    if not self._scheduler.connected.is_set():
+      return "<h1>Mysos scheduler is still connecting...</h1>"
+
+    return self._clusters_template.render(clusters=self._scheduler.clusters)
+
+  @route('/static/<filepath:path>', method=['GET'])
+  def serve_static(self, filepath):
+    return static_file(filepath, root=self._static_dir)
diff --git a/twitter/mysos/scheduler/launcher.py b/twitter/mysos/scheduler/launcher.py
new file mode 100644
index 0000000..c405158
--- /dev/null
+++ b/twitter/mysos/scheduler/launcher.py
@@ -0,0 +1,539 @@
+from collections import namedtuple
+import json
+import random
+import threading
+
+from twitter.common import log
+from twitter.common.quantity import Amount, Time
+from twitter.common.zookeeper.serverset.endpoint import Endpoint, ServiceInstance
+from twitter.mysos.common.cluster import ClusterManager, get_cluster_path
+from twitter.mysos.common import zookeeper
+
+from .elector import MySQLMasterElector
+from .state import MySQLCluster, MySQLTask, StateProvider
+
+import mesos.interface.mesos_pb2 as mesos_pb2
+
+
+# TODO(jyx): Replace this when we start taking tasks from an HTTP API.
+TASK_CPUS = 1
+TASK_MEM = 512
+
+
+class MySQLClusterLauncher(object):
+  """
+    Responsible for launching and maintaining a MySQL cluster.
+
+    Thread-safety:
+      The launcher is thread-safe. It uses a separate thread to wait for the election result and
+      can launch a new election within that thread. All other public methods are called from the
+      scheduler driver thread and the web UI threads.
+  """
+
+  class Error(Exception): pass
+  class IncompatibleRoleError(Error): pass
+  class PermissionError(Error): pass
+
+  def __init__(
+      self,
+      driver,
+      cluster,
+      state_provider,
+      zk_url,
+      kazoo,
+      framework_user,
+      executor_uri,
+      executor_cmd,
+      election_timeout,
+      admin_keypath,
+      installer_args=None,
+      backup_store_args=None,
+      executor_environ=None,
+      framework_role='*',
+      query_interval=Amount(1, Time.SECONDS)):
+    """
+      :param driver: Mesos scheduler driver.
+      :param cluster: The MySQLCluster state object.
+      :param state_provider: For restoring and persisting the cluster state.
+      :param zk_url: The ZooKeeper URL for cluster member discovery and master election.
+      :param kazoo: The Kazoo client to access ZooKeeper with.
+      :param executor_uri: See flags.
+      :param executor_cmd: See flags.
+      :param election_timeout: See flags.
+      :param admin_keypath: See flags.
+      :param installer_args: See flags.
+      :param backup_store_args: See flags.
+      :param executor_environ: See flags.
+      :param framework_role: See flags.
+      :param query_interval: See MySQLMasterElector. Use the default value for production and allow
+                             tests to use a different value.
+    """
+    self._driver = driver
+
+    if not isinstance(cluster, MySQLCluster):
+      raise TypeError("'cluster' should be an instance of MySQLCluster")
+    self._cluster = cluster
+
+    if not isinstance(state_provider, StateProvider):
+      raise TypeError("'state_provider' should be an instance of StateProvider")
+    self._state_provider = state_provider
+
+    self._framework_role = framework_role
+
+    # Passed along to executors.
+    self._zk_url = zk_url
+    self._framework_user = framework_user
+    self._executor_uri = executor_uri
+    self._executor_cmd = executor_cmd
+    self._election_timeout = election_timeout
+    self._admin_keypath = admin_keypath
+    self._installer_args = installer_args
+    self._backup_store_args = backup_store_args
+    self._executor_environ = executor_environ
+
+    # Used by the elector.
+    self._query_interval = query_interval
+
+    zk_root = zookeeper.parse(zk_url)[2]
+    self._cluster_manager = ClusterManager(kazoo, get_cluster_path(zk_root, cluster.name))
+
+    self._lock = threading.Lock()
+
+    if self._cluster.master_id:
+      log.info("Republish master %s for cluster %s in case it's not published" % (
+          self._cluster.master_id, self.cluster_name))
+      self._cluster_manager.promote_member(self._cluster.master_id)
+
+    if len(self._cluster.tasks) > 0:
+      log.info("Recovered %s tasks for cluster '%s'" % (
+          len(self._cluster.tasks), self.cluster_name))
+
+    # A recovered launcher should continue the election if the previous one was incomplete when the
+    # scheduler failed over. Mesos will deliver all missed events that affect the election to the
+    # scheduler.
+    if len(self._cluster.running_tasks) > 0 and not self._cluster.master_id:
+      log.info("Restarting election for the recovered launcher")
+      self._elector = self._new_elector()
+      # Add current slaves.
+      for t in self._cluster.running_tasks:
+        self._elector.add_slave(t.task_id, t.mesos_slave_id)
+      self._elector.start()
+    else:
+      # New launcher, the elector is set when the election starts and reset to None when it ends.
+      self._elector = None
+
+    self._terminating = False
+
+  @property
+  def cluster_name(self):
+    return self._cluster.name
+
+  @property
+  def cluster_info(self):
+    with self._lock:
+      ClusterInfo = namedtuple('ClusterInfo', ('name, user, num_nodes'))
+      return ClusterInfo(
+          name=self._cluster.name, user=self._cluster.user, num_nodes=self._cluster.num_nodes)
+
+  def launch(self, offer):
+    """
+      Try to launch a MySQL task with the given offer.
+
+      :returns:
+        Task ID: Either the task ID of the task just launched or None if this offer is not used.
+        Remaining resources: Resources from this offer that are unused by the task. If no task is
+            launched, all the resources from the offer are returned.
+
+      :raises IncompatibleRoleError: Raised when the offer has some resource with incompatible role.
+    """
+    with self._lock:
+      if len(self._cluster.active_tasks) == self._cluster.num_nodes:
+        # All nodes of this cluster have been launched and none have died.
+        return None, offer.resources
+
+      if self._terminating:
+        return None, offer.resources
+
+      cpus, mem, ports = self._get_resources(offer.resources)
+
+      # TODO(jyx): Replace the static resource requirements with what the user requests.
+      task_cpus = TASK_CPUS
+      task_mem = TASK_MEM
+
+      if cpus < task_cpus or mem < task_mem or len(ports) == 0:
+        # Offer doesn't fit.
+        return None, offer.resources
+
+      log.info("Launcher %s accepted offer %s on Mesos slave %s (%s)" % (
+          self.cluster_name, offer.id.value, offer.slave_id.value, offer.hostname))
+
+      task_port = random.choice(list(ports))  # Randomly pick a port in the offer.
+
+      task_info = self._new_task(offer, task_cpus, task_mem, task_port)
+      self._cluster.tasks[task_info.task_id.value] = MySQLTask(
+          self._cluster.name,
+          task_info.task_id.value,
+          task_info.slave_id.value,
+          offer.hostname,
+          task_port)
+      self._cluster.next_id += 1
+
+      # Checkpoint task data. The task can fail to launch. The problem is solved by the TODO below.
+      self._state_provider.dump_cluster_state(self._cluster)
+
+      log.info('Launching task %s on Mesos slave %s (%s)' % (
+          task_info.task_id.value, offer.slave_id.value, offer.hostname))
+
+      # Mysos launches at most a single task for each offer. Note that the SchedulerDriver API
+      # expects a list of tasks.
+      # TODO(jyx): Reconcile after failover because the scheduler can crash before successfully
+      #            launching the task. Also run implicit reconciliation periodically.
+      self._driver.launchTasks(offer.id, [task_info])
+
+      # Update the offer's resources and return them for other clusters to use.
+      remaining = create_resources(
+          cpus - task_cpus, mem - task_mem, ports - set([task_port]), role=self._framework_role)
+      return task_info.task_id.value, remaining
+
+  def kill(self, password):
+    """
+      Kill the cluster.
+
+      NOTE: Cluster killing is asynchronous. Use 'terminated' property to check if all tasks in the
+      cluster are killed.
+    """
+    with self._lock:
+      if self._cluster.password != password:
+        raise self.PermissionError("No permission to kill cluster %s" % self.cluster_name)
+
+      self._terminating = True
+
+      # TODO(jyx): Task killing is unreliable. Reconciliation should retry killing.
+      for task_id in self._cluster.tasks:
+        log.info("Killing task %s of cluster %s" % (task_id, self.cluster_name))
+        self._driver.killTask(mesos_pb2.TaskID(value=task_id))
+
+  @property
+  def terminated(self):
+    """True if all tasks in the cluster are killed."""
+    return self._terminating and len(self._cluster.active_tasks) == 0
+
+  def _get_resources(self, resources):
+    """Return a tuple of the resources: cpus, mem, set of ports."""
+    cpus, mem, ports = 0.0, 0, set()
+    for resource in resources:
+      # We do the following check:
+      # 1. We only care about the role of the resources we are going to use.
+      # 2. For this resource if it is not of the role we want we throw an exception. This implies
+      #    that when a slave offers resources that include both the '*' role and the Mysos framework
+      #    role we'll decline the entire offer. We expect Mesos slave hosts that run Mysos executors
+      #    to dedicate *all* its resources to it as we are not currently optimizing for the use
+      #    cases where Mysos tasks run side-by-side with tasks from other frameworks. This also
+      #    simplifies the launcher's role filtering logic.
+      #    TODO(jyx): Revisit this when the above assumption changes.
+      if resource.name in ('cpus', 'mem', 'ports') and resource.role != self._framework_role:
+        raise self.IncompatibleRoleError("Offered resource %s has role %s, expecting %s" % (
+            resource.name, resource.role, self._framework_role))
+
+      if resource.name == 'cpus':
+        cpus = resource.scalar.value
+      elif resource.name == 'mem':
+        mem = resource.scalar.value
+      elif resource.name == 'ports' and resource.ranges.range:
+        for r in resource.ranges.range:
+          ports |= set(range(r.begin, r.end + 1))
+
+    return cpus, mem, ports
+
+  def _new_task(self, offer, task_cpus, task_mem, task_port):
+    """Return a new task with the requested resources."""
+    server_id = self._cluster.next_id
+    task_id = "mysos-" + self.cluster_name + "-" + str(server_id)
+
+    task = mesos_pb2.TaskInfo()
+    task.task_id.value = task_id
+    task.slave_id.value = offer.slave_id.value
+    task.name = task_id
+
+    task.executor.executor_id.value = task_id  # Use task_id as executor_id.
+    task.executor.command.value = self._executor_cmd
+
+    if self._executor_environ:  # Could be 'None' since it's an optional argument.
+      executor_environ_ = json.loads(self._executor_environ)
+      if executor_environ_:
+        for var_ in executor_environ_:
+          log.info("Executor will use environment variable: %s" % var_)
+          var = task.executor.command.environment.variables.add()
+          var.name = var_['name']
+          var.value = var_['value']
+
+    uri = task.executor.command.uris.add()
+    uri.value = self._executor_uri
+    uri.executable = True
+    uri.extract = False  # Don't need to decompress pex.
+
+    task.data = json.dumps({
+        'framework_user': self._framework_user,
+        'host': offer.hostname,
+        'port': task_port,
+        'cluster': self._cluster.name,
+        'cluster_user': self._cluster.user,
+        'cluster_password': self._cluster.password,
+        'server_id': server_id,  # Use the integer Task ID as the server ID.
+        'zk_url': self._zk_url,
+        'admin_keypath': self._admin_keypath,
+        'installer_args': self._installer_args,
+        'backup_store_args': self._backup_store_args,
+        'backup_id': self._cluster.backup_id,
+    })
+
+    resources = create_resources(
+        task_cpus, task_mem, set([task_port]), role=self._framework_role)
+    task.resources.extend(resources)
+
+    return task
+
+  def _new_elector(self):
+    """Create a new instance of MySQLMasterElector."""
+    elector = MySQLMasterElector(
+        self._driver,
+        self.cluster_name,
+        self._cluster.next_epoch,
+        self._master_elected,
+        self._election_timeout,
+        query_interval=self._query_interval)
+
+    log.info("Created elector for epoch %s for cluster %s" % (
+        self._cluster.next_epoch, self.cluster_name))
+    self._cluster.next_epoch += 1
+
+    # Save the epoch so the new elector will use a new epoch after scheduler failover.
+    self._state_provider.dump_cluster_state(self._cluster)
+
+    return elector
+
+  def status_update(self, status):
+    """
+      Handle the status update for a task of this cluster.
+
+      NOTE:
+        Duplicate status updates may be handled by either the same scheduler instance or a new
+        instance with the restored state.
+    """
+    with self._lock:
+      task_id = status.task_id.value
+
+      if task_id not in self._cluster.tasks:
+        log.warn("Ignoring status update for unknown task %s" % task_id)
+        return
+
+      task = self._cluster.tasks[task_id]
+      previous_state = task.state
+
+      # We don't want to ignore a duplicate update if the previous one was not successfully handled.
+      # Therefore, we should not checkpoint the status change until we have finished all operations.
+      if previous_state == status.state:
+        log.info('Ignoring duplicate status update %s for task %s' % (
+            mesos_pb2.TaskState.Name(status.state),
+            task_id))
+        return
+
+      if is_terminal(previous_state):
+        log.info('Ignoring status update %s for task %s as it is in terminal state %s' % (
+            mesos_pb2.TaskState.Name(status.state),
+            task_id,
+            mesos_pb2.TaskState.Name(previous_state)))
+        return
+
+      log.info('Updating state of task %s of cluster %s from %s to %s' % (
+          status.task_id.value,
+          self.cluster_name,
+          mesos_pb2.TaskState.Name(previous_state),
+          mesos_pb2.TaskState.Name(status.state)))
+      task.state = status.state
+
+      if status.state == mesos_pb2.TASK_RUNNING:
+        # Register this cluster member.
+        endpoint = Endpoint(
+            self._cluster.tasks[task_id].hostname, self._cluster.tasks[task_id].port)
+
+        # If the scheduler fails over after ZK is updated but before the state change is
+        # checkpointed, it will receive the same status update again and try to publish a duplicate
+        # member to ZK. ClusterManager.add_member() is idempotent and doesn't update ZK in this
+        # case.
+        member_id = self._cluster_manager.add_member(ServiceInstance(endpoint))
+        log.info('Added %s (member id=%s) to cluster %s' % (endpoint, member_id, self.cluster_name))
+        self._cluster.members[task_id] = member_id
+
+        # Checkpoint the status update here. It's OK if the elector fails to launch later because
+        # the new scheduler instance will retry based on the fact that there are running instances
+        # of the cluster but no master.
+        self._state_provider.dump_cluster_state(self._cluster)
+
+        # If MySQL master is already elected for this cluster don't bother adding it to the elector.
+        if self._cluster.master_id:
+          log.info(
+              "MySQL slave task %s on %s started after a master is already elected for cluster %s" %
+              (task_id, endpoint.host, self.cluster_name))
+          return
+
+        if not self._elector:
+          self._elector = self._new_elector()
+          # Add current slaves.
+          for t in self._cluster.running_tasks:
+            self._elector.add_slave(t.task_id, t.mesos_slave_id)
+          self._elector.start()
+        else:
+          self._elector.add_slave(task_id, status.slave_id.value)
+      elif status.state == mesos_pb2.TASK_FINISHED:
+        raise self.Error("Task %s is in unexpected state %s with message '%s'" % (
+            status.task_id.value,
+            mesos_pb2.TaskState.Name(status.state),
+            status.message))
+      elif is_terminal(status.state):
+        if status.state == mesos_pb2.TASK_KILLED:
+          log.info("Task %s was successfully killed" % status.task_id.value)
+        else:
+          log.error("Task %s is now in terminal state %s with message '%s'" % (
+              status.task_id.value,
+              mesos_pb2.TaskState.Name(status.state),
+              status.message))
+        del self._cluster.tasks[task_id]
+
+        if task_id in self._cluster.members:
+          member_id = self._cluster.members[task_id]
+          del self._cluster.members[task_id]
+
+          # If the scheduler fails over after ZK is updated but before its result is persisted, it
+          # will receive the same status update and try to remove the non-existent member.
+          # Removing a non-existent member is a no-op for ClusterManager.remove_member().
+          # Note that if the order is reversed, the scheduler will fail to clean up the orphan ZK
+          # entry.
+          self._cluster_manager.remove_member(member_id)
+
+          if member_id == self._cluster.master_id:
+            self._cluster.master_id = None
+            log.info("Master of cluster %s has terminated. Restarting election" % self.cluster_name)
+
+            assert not self._elector, "Election must not be running since there is a current master"
+            self._elector = self._new_elector()
+
+            # Add current slaves after removing the terminated task.
+            for t in self._cluster.running_tasks:
+              self._elector.add_slave(t.task_id, t.mesos_slave_id)
+            self._elector.start()
+          else:
+            # It will be rescheduled next time the launcher is given an offer.
+            log.info("Slave %s of cluster %s has terminated" % (task_id, self.cluster_name))
+        else:
+          assert previous_state != mesos_pb2.TASK_RUNNING, (
+              "Task must exist in ClusterManager if it was running")
+          log.warn("Slave %s of cluster %s failed to start running" % (task_id, self.cluster_name))
+
+        if self.terminated:
+          log.info("Shutting down launcher for cluster %s" % self.cluster_name)
+          self._shutdown()
+          return
+
+        # Finally, checkpoint the status update.
+        self._state_provider.dump_cluster_state(self._cluster)
+        log.info("Checkpointed the status update for task %s of cluster %s" % (
+            task_id, self.cluster_name))
+
+  def _shutdown(self):
+    self._cluster_manager.delete_cluster()
+    log.info("Deleted cluster %s from ZooKeeper" % self.cluster_name)
+    self._state_provider.remove_cluster_state(self.cluster_name)
+    log.info("Removed the state of cluster %s" % self.cluster_name)
+
+    if self._elector:
+      self._elector.abort()
+      self._elector = None
+
+  def _master_elected(self, master_task):
+    """
+      Invoked by the elector when a master is elected for this cluster.
+
+      :param master_task: The task ID for the elected master.
+
+      NOTE: A new election can be started if the currently elected master has already terminated
+      before the election result arrives at the launcher.
+    """
+    if not master_task:
+      log.error("No master can be elected for cluster %s" % self.cluster_name)
+      return
+
+    with self._lock:
+      self._elector = None  # Elector will terminate soon.
+
+      if master_task not in self._cluster.tasks:
+        log.info("Slave %s of cluster %s was elected but has died. Restarting election" % (
+            master_task, self.cluster_name))
+        self._elector = self._new_elector()
+        # Add current slaves.
+        for t in self._cluster.running_tasks:
+          self._elector.add_slave(t.task_id, t.mesos_slave_id)
+        self._elector.start()
+        return
+
+      assert master_task in self._cluster.members, (
+          "Elected master must have been added to 'members'")
+      master_id = self._cluster.members[master_task]
+      slave_host = self._cluster.tasks[master_task].hostname
+
+      log.info('Promoting MySQL task %s on host %s (member ID: %s) as the master for cluster %s' % (
+          master_task, slave_host, master_id, self.cluster_name))
+
+      # Persist the elected master before publishing to ZK. If the scheduler fails over before the
+      # result is persisted, it re-elects one.
+      self._cluster.master_id = master_id
+      self._state_provider.dump_cluster_state(self._cluster)
+
+      # Publish the elected master. If the scheduler fails over before the master is published, it
+      # republishes it.
+      self._cluster_manager.promote_member(master_id)
+
+  def framework_message(self, task_id, slave_id, message):
+    with self._lock:
+      if self._elector:
+        data = json.loads(message)
+        self._elector.update_position(int(data["epoch"]), task_id, data["position"])
+      else:
+        log.info("Received framework message '%s' from task %s (%s) when there is no pending "
+            "election" % (message, task_id, slave_id))
+
+
+# --- Utility methods. ---
+def create_resources(cpus, mem, ports, role='*'):
+  """Return a list of 'Resource' protobuf for the provided resources."""
+  cpus_resources = mesos_pb2.Resource()
+  cpus_resources.name = 'cpus'
+  cpus_resources.type = mesos_pb2.Value.SCALAR
+  cpus_resources.role = role
+  cpus_resources.scalar.value = cpus
+
+  mem_resources = mesos_pb2.Resource()
+  mem_resources.name = 'mem'
+  mem_resources.type = mesos_pb2.Value.SCALAR
+  mem_resources.role = role
+  mem_resources.scalar.value = mem
+
+  ports_resources = mesos_pb2.Resource()
+  ports_resources.name = 'ports'
+  ports_resources.type = mesos_pb2.Value.RANGES
+  ports_resources.role = role
+  for port in ports:
+    port_range = ports_resources.ranges.range.add()
+    port_range.begin = port
+    port_range.end = port
+
+  return [cpus_resources, mem_resources, ports_resources]
+
+
+def is_terminal(state):
+  """Return true if the task reached terminal state."""
+  return state in [
+    mesos_pb2.TASK_FINISHED,
+    mesos_pb2.TASK_KILLED,
+    mesos_pb2.TASK_FAILED,
+    mesos_pb2.TASK_LOST]
diff --git a/twitter/mysos/scheduler/mysos_scheduler.py b/twitter/mysos/scheduler/mysos_scheduler.py
new file mode 100644
index 0000000..fe9273e
--- /dev/null
+++ b/twitter/mysos/scheduler/mysos_scheduler.py
@@ -0,0 +1,295 @@
+import os
+import tempfile
+
+from twitter.common import app, log
+from twitter.common.exceptions import ExceptionalThread
+from twitter.common.http import HttpServer
+from twitter.common.log.options import LogOptions
+from twitter.common.quantity import Time
+from twitter.common.quantity.parse_simple import InvalidTime, parse_time
+from twitter.mysos.common import pkgutil, zookeeper
+
+from .http import MysosServer
+from .scheduler import MysosScheduler
+from .state import LocalStateProvider, Scheduler, StateProvider
+from .zk_state import ZooKeeperStateProvider
+
+from kazoo.client import KazooClient
+
+import mesos.interface
+from mesos.interface.mesos_pb2 import Credential, FrameworkInfo
+import mesos.native
+import yaml
+
+
+FRAMEWORK_NAME = 'mysos'
+MYSOS_MODULE = 'twitter.mysos.scheduler'
+ASSET_RELPATH = 'assets'
+
+
+LogOptions.disable_disk_logging()
+LogOptions.set_stderr_log_level('google:INFO')
+
+
+def proxy_main():
+  app.add_option(
+      '--port',
+      dest='api_port',
+      type='int',
+      default=None,
+      help='Port for the HTTP API server')
+
+  app.add_option(
+      '--mesos_master',
+      dest='mesos_master',
+      default=None,
+      help='Mesos master address. It can be a ZooKeeper URL through which the master can be '
+           'detected')
+
+  app.add_option(
+      '--framework_user',
+      dest='framework_user',
+      help='The Unix user that Mysos executor runs as')
+
+  app.add_option(
+      '--framework_role',
+      dest='framework_role',
+      default='*',
+      help="The role that Mysos framework runs as. If set, Mysos only uses Mesos pool resources "
+           "with that role. The default value '*' is what Mesos considers as the default role.\n"
+           "NOTE: Mesos master needs to be configured to allow the specified role. See its --roles "
+           "flag")
+
+  app.add_option(
+      '--executor_uri',
+      dest='executor_uri',
+      default=None,
+      help='URI for the Mysos executor package')
+
+  app.add_option(
+      '--executor_cmd',
+      dest='executor_cmd',
+      default=None,
+      help='Command to execute the executor package')
+
+  app.add_option(
+      '--executor_environ',
+      dest='executor_environ',
+      default=None,
+      help="Environment variables for the executors (and the tasks) as a list of dicts keyed by "
+           "{name, value} in JSON. Note that these variables don't affect Mesos slave components "
+           "such as the fetcher")
+
+  app.add_option(
+      '--zk_url',
+      dest='zk_url',
+      default=None,
+      help='ZooKeeper URL for various Mysos operations, in the form of '
+           '"zk://username:password@servers/path". The sub-directory <zk_url>/discover is used for '
+           'communicating MySQL cluster information between Mysos scheduler and executors')
+
+  # TODO(jyx): This could also be made a per-cluster configuration.
+  app.add_option(
+      '--election_timeout',
+      dest='election_timeout',
+      default='60s',
+      help='The amount of time the scheduler waits for all slaves to respond during a MySQL master '
+           'election, e.g., 60s. After the timeout the master is elected from only the slaves that '
+           'have responded')
+
+  app.add_option(
+      '--admin_keypath',
+      dest='admin_keypath',
+      default=None,
+      help='The path to the key file with MySQL admin credentials on Mesos slaves')
+
+  app.add_option(
+      '--work_dir',
+      dest='work_dir',
+      default=os.path.join(tempfile.gettempdir(), 'mysos'),
+      help="Directory path to place Mysos work directories, e.g., web assets, state files if "
+           "--state_storage=local. Default to a system temp directory.")
+
+  app.add_option(
+      '--state_storage',
+      dest='state_storage',
+      default='zk',
+      help="Mechanism to persist scheduler state. Available options are 'zk' and 'local'. If 'zk' "
+           "is chosen, the scheduler state is stored under <zk_url>/state; see --zk_url. Otherwise "
+           "'local' is chosen and the state is persisted under <work_dir>/state; see --work_dir")
+
+  app.add_option(
+      '--framework_failover_timeout',
+      dest='framework_failover_timeout',
+      default='14d',
+      help='Time after which Mysos framework is considered deleted. This implies losing all tasks. '
+           'SHOULD BE VERY HIGH')
+
+  # TODO(jyx): Flags like this are generally optional but specific executor implementations may
+  # require them. Consider adding validators that can be plugged in so configuration errors can be
+  # caught in the scheduler.
+  app.add_option(
+      '--installer_args',
+      dest='installer_args',
+      default=None,
+      help='Arguments for MySQL installer directly passed along to and parsed by the installer. '
+           'e.g., a serialized JSON string'
+  )
+
+  app.add_option(
+      '--backup_store_args',
+      dest='backup_store_args',
+      default=None,
+      help="Arguments for the store for MySQL backups. Its use and format are defined by the "
+           "backup store implementation. e.g., It can be a serialized JSON string"
+  )
+
+  app.add_option(
+      '--framework_authentication_file',
+      dest='framework_authentication_file',
+      default=None,
+      help="Path to the key file for authenticating the framework against Mesos master. Framework "
+           "will fail to register with Mesos if authentication is required by Mesos and this "
+           "option is not provided"
+  )
+
+  def main(args, options):
+    log.info("Options in use: %s", options)
+
+    if not options.api_port:
+      app.error('Must specify --port')
+
+    if not options.mesos_master:
+      app.error('Must specify --mesos_master')
+
+    if not options.framework_user:
+      app.error('Must specify --framework_user')
+
+    if not options.executor_uri:
+      app.error('Must specify --executor_uri')
+
+    if not options.executor_cmd:
+      app.error('Must specify --executor_cmd')
+
+    if not options.zk_url:
+      app.error('Must specify --zk_url')
+
+    if not options.admin_keypath:
+      app.error('Must specify --admin_keypath')
+
+    try:
+      election_timeout = parse_time(options.election_timeout)
+      framework_failover_timeout = parse_time(options.framework_failover_timeout)
+    except InvalidTime as e:
+      app.error(e.message)
+
+    try:
+      _, zk_servers, zk_root = zookeeper.parse(options.zk_url)
+    except Exception as e:
+      app.error("Invalid --zk_url: %s" % e.message)
+
+    web_assets_dir = os.path.join(options.work_dir, "web")
+    pkgutil.unpack_assets(web_assets_dir, MYSOS_MODULE, ASSET_RELPATH)
+    log.info("Extracted web assets into %s" % options.work_dir)
+
+    fw_principal = None
+    fw_secret = None
+    if options.framework_authentication_file:
+      try:
+        with open(options.framework_authentication_file, "r") as f:
+          cred = yaml.load(f)
+        fw_principal = cred["principal"]
+        fw_secret = cred["secret"]
+        log.info("Loaded credential (principal=%s) for framework authentication" % fw_principal)
+      except IOError as e:
+        app.error("Unable to read the framework authentication key file: %s" % e)
+      except (KeyError, yaml.YAMLError) as e:
+        app.error("Invalid framework authentication key file format %s" % e)
+
+    log.info("Starting Mysos scheduler")
+
+    kazoo = KazooClient(zk_servers)
+    kazoo.start()
+
+    if options.state_storage == 'zk':
+      log.info("Using ZooKeeper (path: %s) for state storage" % zk_root)
+      state_provider = ZooKeeperStateProvider(kazoo, zk_root)
+    else:
+      log.info("Using local disk for state storage")
+      state_provider = LocalStateProvider(options.work_dir)
+
+    try:
+      state = state_provider.load_scheduler_state()
+    except StateProvider.Error as e:
+      app.error(e.message)
+
+    if state:
+      log.info("Successfully restored scheduler state")
+      framework_info = state.framework_info
+      if framework_info.HasField('id'):
+        log.info("Recovered scheduler's FrameworkID is %s" % framework_info.id.value)
+    else:
+      log.info("No scheduler state to restore")
+      framework_info = FrameworkInfo(
+          user=options.framework_user,
+          name=FRAMEWORK_NAME,
+          checkpoint=True,
+          failover_timeout=framework_failover_timeout.as_(Time.SECONDS),
+          role=options.framework_role)
+      if fw_principal:
+        framework_info.principal = fw_principal
+      state = Scheduler(framework_info)
+      state_provider.dump_scheduler_state(state)
+
+    scheduler = MysosScheduler(
+        state,
+        state_provider,
+        options.framework_user,
+        options.executor_uri,
+        options.executor_cmd,
+        kazoo,
+        options.zk_url,
+        election_timeout,
+        options.admin_keypath,
+        installer_args=options.installer_args,
+        backup_store_args=options.backup_store_args,
+        executor_environ=options.executor_environ,
+        framework_role=options.framework_role)
+
+    if fw_principal and fw_secret:
+      cred = Credential(principal=fw_principal, secret=fw_secret)
+      scheduler_driver = mesos.native.MesosSchedulerDriver(
+          scheduler,
+          framework_info,
+          options.mesos_master,
+          cred)
+    else:
+      scheduler_driver = mesos.native.MesosSchedulerDriver(
+          scheduler,
+          framework_info,
+          options.mesos_master)
+
+    scheduler_driver.start()
+
+    server = HttpServer()
+    server.mount_routes(MysosServer(scheduler, web_assets_dir))
+
+    et = ExceptionalThread(
+        target=server.run, args=('0.0.0.0', options.api_port, 'cherrypy'))
+    et.daemon = True
+    et.start()
+
+    try:
+      # Wait for the scheduler to stop.
+      # The use of 'stopped' event instead of scheduler_driver.join() is necessary to stop the process
+      # with SIGINT.
+      while not scheduler.stopped.wait(timeout=0.5):
+        pass
+    except KeyboardInterrupt:
+      log.info('Interrupted, exiting.')
+    else:
+      log.info('Scheduler exited.')
+
+    app.shutdown(1)  # Mysos scheduler is supposed to be long-running thus the use of exit status 1.
+
+  app.main()
diff --git a/twitter/mysos/scheduler/scheduler.py b/twitter/mysos/scheduler/scheduler.py
new file mode 100644
index 0000000..03734ae
--- /dev/null
+++ b/twitter/mysos/scheduler/scheduler.py
@@ -0,0 +1,381 @@
+from collections import OrderedDict
+import posixpath
+import random
+import threading
+import string
+import sys
+
+from twitter.common import log
+from twitter.common.collections.orderedset import OrderedSet
+from twitter.common.quantity import Amount, Time
+from twitter.mysos.common.cluster import get_cluster_path
+from twitter.mysos.common.decorators import logged
+
+from .launcher import MySQLClusterLauncher
+from .state import MySQLCluster, Scheduler, StateProvider
+
+import mesos.interface
+import mesos.interface.mesos_pb2 as mesos_pb2
+
+
+# Refuse the offer for "eternity".
+# NOTE: Using sys.maxint / 2 because sys.maxint causes rounding and precision loss when converted to
+# double 'refuse_seconds' in the ProtoBuf and results in a negative duration on Mesos Master.
+INCOMPATIBLE_ROLE_OFFER_REFUSE_DURATION = Amount(sys.maxint / 2, Time.NANOSECONDS)
+
+
+class MysosScheduler(mesos.interface.Scheduler):
+
+  class Error(Exception): pass
+
+  class ClusterExists(Error): pass
+  class ClusterNotFound(Error): pass
+  class InvalidUser(Error): pass
+  class ServiceUnavailable(Error): pass
+
+  def __init__(
+      self,
+      state,
+      state_provider,
+      framework_user,
+      executor_uri,
+      executor_cmd,
+      kazoo,
+      zk_url,
+      election_timeout,
+      admin_keypath,
+      installer_args=None,
+      backup_store_args=None,
+      executor_environ=None,
+      framework_role='*'):
+    """
+      :param state: The Scheduler object.
+      :param state_provider: The StateProvider instance that the scheduler should use to
+                             restore/persist states.
+      :param framework_user: See flags.
+      :param executor_uri: See flags.
+      :param executor_cmd: See flags.
+      :param framework_role: See flags.
+      :param election_timeout: See flags.
+      :param admin_keypath: See flags.
+      :param installer_args: See flags.
+      :param backup_store_args: See flags.
+      :param executor_environ: See flags.
+      :param kazoo: The Kazoo client for communicating MySQL cluster information between the
+                    scheduler and the executors.
+      :param zk_url: ZooKeeper URL for used by the scheduler and the executors to access ZooKeeper.
+    """
+    self._lock = threading.Lock()
+
+    if not isinstance(state, Scheduler):
+      raise TypeError("'state' should be an instance of Scheduler")
+    self._state = state
+
+    if not isinstance(state_provider, StateProvider):
+      raise TypeError("'state_provider' should be an instance of StateProvider")
+    self._state_provider = state_provider
+
+    self._framework_user = framework_user
+    self._executor_uri = executor_uri
+    self._executor_cmd = executor_cmd
+    self._framework_role = framework_role
+    self._election_timeout = election_timeout
+    self._admin_keypath = admin_keypath
+    self._installer_args = installer_args
+    self._backup_store_args = backup_store_args
+    self._executor_environ = executor_environ
+
+    self._driver = None  # Will be set by registered().
+
+    # Use a subdir to avoid name collision with the state storage.
+    self._discover_zk_url = posixpath.join(zk_url, "discover")
+    self._kazoo = kazoo
+
+    self._tasks = {}  # {Task ID: cluster name} mappings.
+    self._launchers = OrderedDict()  # Order-preserving {cluster name : MySQLClusterLauncher}
+                                     # mappings so cluster requests are fulfilled on a first come,
+                                     # first serve (FCFS) basis.
+
+    self.stopped = threading.Event()  # An event set when the scheduler is stopped.
+    self.connected = threading.Event()  # An event set when the scheduler is first connected to
+                                        # Mesos. The scheduler tolerates later disconnections.
+
+  # --- Public interface. ---
+  def create_cluster(self, cluster_name, cluster_user, num_nodes, backup_id=None):
+    """
+      :param cluster_name: Name of the cluster.
+      :param cluster_user: The user account on MySQL server.
+      :param num_nodes: Number of nodes in the cluster.
+      :param backup_id: The 'backup_id' of the backup to restore from. If None then Mysos starts an
+                        empty instance.
+
+      :return: a tuple of the following:
+        - ZooKeeper URL for this Mysos cluster that can be used to resolve MySQL cluster info.
+        - The password for the specified user of the specified cluster.
+
+      NOTE:
+        If the scheduler fails over after the cluster state is checkpointed, the new scheduler
+        instance will restore the state and continue to launch the cluster. TODO(jyx): Need to allow
+        users to retrieve the cluster info (e.g. the passwords) afterwards in case the user request
+        has failed but the cluster is successfully created eventually.
+    """
+    with self._lock:
+      if not self._driver:
+        # 'self._driver' is set in (re)registered() after which the scheduler becomes "available".
+        # We need to get hold of the driver to recover the scheduler.
+        raise self.ServiceUnavailable("Service unavailable. Try again later")
+
+      if cluster_name in self._state.clusters:
+        raise self.ClusterExists("Cluster '%s' already exists" % cluster_name)
+
+      if not cluster_user:
+        raise self.InvalidUser('Invalid user name: %s' % cluster_user)
+
+      if int(num_nodes) <= 0:
+        raise ValueError("Invalid number of cluster nodes: %s" % num_nodes)
+
+      self._state.clusters.add(cluster_name)
+      self._state_provider.dump_scheduler_state(self._state)
+
+      cluster = MySQLCluster(
+          cluster_name,
+          cluster_user,
+          gen_password(),
+          int(num_nodes),
+          backup_id=backup_id)
+      self._state_provider.dump_cluster_state(cluster)
+
+      log.info("Creating launcher for cluster %s" % cluster_name)
+      self._launchers[cluster_name] = MySQLClusterLauncher(
+          self._driver,
+          cluster,
+          self._state_provider,
+          self._discover_zk_url,
+          self._kazoo,
+          self._framework_user,
+          self._executor_uri,
+          self._executor_cmd,
+          self._election_timeout,
+          self._admin_keypath,
+          installer_args=self._installer_args,
+          backup_store_args=self._backup_store_args,
+          executor_environ=self._executor_environ,
+          framework_role=self._framework_role)
+
+      return get_cluster_path(self._discover_zk_url, cluster_name), cluster.password
+
+  def delete_cluster(self, cluster_name, password):
+    """
+      :return: ZooKeeper URL for this Mysos cluster that can be used to wait for the termination of
+               the cluster.
+    """
+    with self._lock:
+      if not self._driver:
+        raise self.ServiceUnavailable("Service unavailable. Try again later")
+
+      if cluster_name not in self._state.clusters:
+        raise self.ClusterNotFound("Cluster '%s' not found" % cluster_name)
+
+      launcher = self._launchers[cluster_name]
+      launcher.kill(password)
+      log.info("Attempted to kill cluster %s" % cluster_name)
+
+      return get_cluster_path(self._discover_zk_url, cluster_name)
+
+  @property
+  def clusters(self):
+    """
+      A generator for information about clusters.
+    """
+    with self._lock:
+      for launcher in self._launchers.values():
+        yield launcher.cluster_info
+
+  def _stop(self):
+    """Stop the scheduler."""
+
+    # 'self._driver' is set in registered() so it could be None if the scheduler is asked to stop
+    # before it is registered (e.g. an error is received).
+    if self._driver:
+      self._driver.stop(True)  # Set failover to True.
+    self.stopped.set()
+
+  # --- Mesos methods. ---
+  @logged
+  def registered(self, driver, frameworkId, masterInfo):
+    self._driver = driver
+    self._state.framework_info.id.value = frameworkId.value
+    self._state_provider.dump_scheduler_state(self._state)
+
+    # Recover only after the scheduler is connected because it needs '_driver' to be assigned. This
+    # is blocking the scheduler driver thread but we do want further messages to be blocked until
+    # the scheduler state is fully recovered.
+    # TODO(jyx): If performance becomes an issue, we can also restore all the state data while the
+    # driver is connecting and proceed to recover all the internal state objects after the driver is
+    # connected.
+    try:
+      self._recover()
+    except self.Error as e:
+      log.error("Stopping scheduler because: %s" % e)
+      self._stop()
+      return
+
+    self.connected.set()
+
+  def _recover(self):
+    """
+      Recover launchers for existing clusters. A newly created scheduler has no launcher to recover.
+      TODO(jyx): The recovery of clusters can potentially be parallelized.
+    """
+    for cluster_name in OrderedSet(self._state.clusters):  # Make a copy so we can remove dead
+                                                           # entries while iterating the copy.
+      log.info("Recovering launcher for cluster %s" % cluster_name)
+      try:
+        cluster = self._state_provider.load_cluster_state(cluster_name)
+        if not cluster:
+          # The scheduler could have failed over before creating the launcher. The user request
+          # should have failed and there is no cluster state to restore.
+          log.info("Skipping cluster %s because its state cannot be found" % cluster_name)
+          self._state.clusters.remove(cluster_name)
+          self._state_provider.dump_scheduler_state(self._state)
+          continue
+        for task_id in cluster.tasks:
+          self._tasks[task_id] = cluster.name  # Reconstruct the 'tasks' map.
+        # Order of launchers is preserved thanks to the OrderedSet.
+        # For recovered launchers we use the currently specified --framework_role and
+        # --executor_environ, etc., instead of saving it in cluster state so the change in flags can
+        # be picked up by existing clusters.
+        self._launchers[cluster.name] = MySQLClusterLauncher(
+            self._driver,
+            cluster,
+            self._state_provider,
+            self._discover_zk_url,
+            self._kazoo,
+            self._framework_user,
+            self._executor_uri,
+            self._executor_cmd,
+            self._election_timeout,
+            self._admin_keypath,
+            self._installer_args,
+            self._backup_store_args,
+            self._executor_environ,
+            self._framework_role)
+      except StateProvider.Error as e:
+        raise self.Error("Failed to recover cluster: %s" % e.message)
+
+    log.info("Recovered %s clusters" % len(self._launchers))
+
+  @logged
+  def reregistered(self, driver, masterInfo):
+    self._driver = driver
+    self.connected.set()
+    # TODO(jyx): Reconcile tasks.
+
+  @logged
+  def disconnected(self, driver):
+    pass
+
+  @logged
+  def resourceOffers(self, driver, offers):
+    log.info('Got %d resource offers' % len(offers))
+
+    with self._lock:
+      # Current scheduling algorithm: randomly pick an offer and loop through the list of launchers
+      # until one decides to use this offer to launch a task.
+      # It's possible to launch multiple tasks on the same Mesos slave (in different batches of
+      # offers).
+      for offer in shuffled(offers):
+        task_id = None
+        # 'filters' is set when we need to create a special filter for incompatible roles.
+        filters = None
+        # For each offer, launchers are asked to launch a task in the order they are added (FCFS).
+        for name in self._launchers:
+          launcher = self._launchers[name]
+          try:
+            task_id, _ = launcher.launch(offer)
+          except MySQLClusterLauncher.IncompatibleRoleError as e:
+            # This "error" is not severe and we expect this to occur frequently only when Mysos
+            # first joins the cluster. For a running Mesos cluster this should be somewhat rare
+            # because we refuse the offer "forever".
+            filters = mesos_pb2.Filters()
+            filters.refuse_seconds = INCOMPATIBLE_ROLE_OFFER_REFUSE_DURATION.as_(Time.SECONDS)
+            break  # No need to check with other launchers.
+          if task_id:
+            self._tasks[task_id] = launcher.cluster_name
+            # No need to check with other launchers. 'filters' remains unset.
+            break
+        if task_id:
+          break  # Some launcher has used this offer. Move on to the next one.
+
+        if filters:
+          log.info("Declining offer %s for %s because '%s'" % (
+              offer.id.value, INCOMPATIBLE_ROLE_OFFER_REFUSE_DURATION, e))
+        else:
+          log.info("Declining offer %s because no launcher can use this offer" % offer.id.value)
+          # Mesos scheduler Python binding doesn't deal with filters='None' properly.
+          # See https://issues.apache.org/jira/browse/MESOS-2567.
+          filters = mesos_pb2.Filters()
+        self._driver.declineOffer(offer.id, filters)
+
+  @logged
+  def statusUpdate(self, driver, status):
+    with self._lock:
+      # Forward the status update to the corresponding launcher.
+      task_id = status.task_id.value
+      launcher = self._get_launcher_by_task_id(task_id)
+      if not launcher:
+        log.info("Cluster for task %s doesn't exist. It could have been removed" % task_id)
+        return
+
+      try:
+        launcher.status_update(status)
+      except MySQLClusterLauncher.Error as e:
+        log.error("Status update failed due to launcher error: %s" % e.message)
+        self._stop()
+
+      if launcher.terminated:
+        log.info("Deleting the launcher for cluster %s because the cluster has terminated" %
+                 launcher.cluster_name)
+        self._state.clusters.discard(launcher.cluster_name)
+        self._state_provider.dump_scheduler_state(self._state)
+        del self._launchers[launcher.cluster_name]
+
+  @logged
+  def frameworkMessage(self, driver, executorId, slaveId, message):
+    log.info('Received framework message %s' % message)
+    task_id = executorId.value  # task_id == executor_id in Mysos.
+
+    launcher = self._get_launcher_by_task_id(task_id)
+    launcher.framework_message(task_id, slaveId.value, message)
+
+  @logged
+  def slaveLost(self, driver, slaveId):
+    # We receive TASK_LOSTs when a slave is lost so we we don't need to handle it separately here.
+    pass
+
+  @logged
+  def error(self, driver, message):
+    log.error('Received error from mesos: %s' % message)
+    self._stop()  # SchedulerDriver aborts when an error message is received.
+
+  def _get_launcher_by_task_id(self, task_id):
+    # TODO(jyx): Currently we don't delete entries from 'self._tasks' so a mapping can always
+    # be found but we should clean it up when tasks die.
+    assert task_id in self._tasks
+    cluster_name = self._tasks[task_id]
+    return self._launchers.get(cluster_name)  # Cluster could have been removed.
+
+
+def shuffled(li):
+  """Return a shuffled version of the list."""
+  copy = li[:]
+  random.shuffle(copy)
+  return copy
+
+
+def gen_password():
+  """Return a randomly-generated password of 21 characters."""
+  return ''.join(random.choice(
+      string.ascii_uppercase +
+      string.ascii_lowercase +
+      string.digits) for _ in range(21))
diff --git a/twitter/mysos/scheduler/state.py b/twitter/mysos/scheduler/state.py
new file mode 100644
index 0000000..5e8efd6
--- /dev/null
+++ b/twitter/mysos/scheduler/state.py
@@ -0,0 +1,204 @@
+from abc import abstractmethod
+import cPickle
+from cPickle import PickleError
+import os
+
+from twitter.common import log
+from twitter.common.collections.orderedset import OrderedSet
+from twitter.common.dirutil import safe_mkdir
+
+from mesos.interface import mesos_pb2
+
+
+class StateProvider(object):
+  """
+    StateProvider is responsible for checkpointing and restoring the state of the Mysos scheduler.
+
+    It maintains the following key hierarchy:
+      /state/scheduler  # Scheduler-level state.
+      /state/clusters/  # Folder for all cluster-level states.
+        cluster1        # State for 'cluster1'.
+        cluster2        # State for 'cluster2'.
+        ...
+  """
+
+  class Error(Exception): pass
+
+  @abstractmethod
+  def dump_scheduler_state(self, state):
+    """Persist scheduler-level state."""
+    pass
+
+  @abstractmethod
+  def load_scheduler_state(self):
+    """
+      Restore scheduler-level state.
+      :return: The Scheduler object. None if no state is available.
+    """
+    pass
+
+  @abstractmethod
+  def dump_cluster_state(self, state):
+    """Persist cluster-level state."""
+    pass
+
+  @abstractmethod
+  def load_cluster_state(self, cluster_name):
+    """
+      Restore cluster-level state.
+      :return: The MySQLCluster object. None if no state is available.
+    """
+    pass
+
+  @abstractmethod
+  def remove_cluster_state(self, cluster_name):
+    """Remove cluster-level state."""
+    pass
+
+  # --- Helper methods. ---
+  @classmethod
+  def _get_scheduler_state_key(cls):
+    return ['state', 'scheduler']
+
+  @classmethod
+  def _get_cluster_state_key(cls, cluster_name):
+    return ['state', 'clusters', cluster_name]
+
+
+class Scheduler(object):
+  """
+    Scheduler-level state.
+
+    NOTE: It references cluster-level states indirectly through cluster names.
+  """
+
+  def __init__(self, framework_info):
+    self.framework_info = framework_info
+    self.clusters = OrderedSet()  # Names of clusters this scheduler manages. cluster creation
+                                  # order is preserved with the OrderedSet.
+
+
+class MySQLCluster(object):
+  """
+    The state of a MySQL cluster.
+
+    It includes tasks (MySQLTask) for members of the cluster.
+  """
+
+  def __init__(self, name, user, password, num_nodes, backup_id=None):
+    if not isinstance(num_nodes, int):
+      raise TypeError("'num_nodes' should be an int")
+
+    self.name = name
+    self.user = user
+    self.password = password
+    self.num_nodes = num_nodes
+    self.backup_id = backup_id
+
+    self.members = {}  # {TaskID : MemberID} mappings. MemberIDs are assigned by ZooKeeper. A task
+                       # must be running and published to ZK before it becomes a member.
+    self.master_id = None  # MemberID of the MySQL master.
+    self.tasks = {}  # {TaskID : MySQLTask} mappings
+    self.next_epoch = 0  # Monotonically increasing number after each master change.
+    self.next_id = 0  # Monotonically increasing number for unique task IDs.
+
+  @property
+  def active_tasks(self):
+    """Tasks that have been launched and have not terminated."""
+    return [t for t in self.tasks.values() if t.state in (
+      mesos_pb2.TASK_STAGING, mesos_pb2.TASK_STARTING, mesos_pb2.TASK_RUNNING)]
+
+  @property
+  def running_tasks(self):
+    return [t for t in self.tasks.values() if t.state == mesos_pb2.TASK_RUNNING]
+
+
+class MySQLTask(object):
+  """The state of a MySQL task."""
+
+  def __init__(self, cluster_name, task_id, mesos_slave_id, hostname, port):
+    if not isinstance(port, int):
+      raise TypeError("'port' should be an int")
+
+    self.cluster_name = cluster_name  # So we can refer back to the cluster it belongs to.
+    self.task_id = task_id
+    self.mesos_slave_id = mesos_slave_id
+    self.hostname = hostname
+    self.port = port
+    self.state = mesos_pb2.TASK_STAGING  # Initial state. Will be updated by statusUpdate().
+
+
+class LocalStateProvider(StateProvider):
+  """StateProvider implementation that uses local disk to store the state."""
+
+  def __init__(self, work_dir):
+    """
+      :param work_dir: The root directory under which the scheduler state is stored. e.g. The path
+                       for 'cluster1' is <work_dir>/state/clusters/cluster1.
+    """
+    self._work_dir = work_dir
+
+  def dump_scheduler_state(self, state):
+    if not isinstance(state, Scheduler):
+      raise TypeError("'state' should be an instance of Scheduler")
+    path = self._get_scheduler_state_path()
+    safe_mkdir(os.path.dirname(path))
+
+    try:
+      with open(path, 'wb') as f:
+        cPickle.dump(state, f)
+    except PickleError as e:
+      raise self.Error('Failed to persist Scheduler: %s' % e)
+
+  def load_scheduler_state(self):
+    path = self._get_scheduler_state_path()
+    if not os.path.isfile(path):
+      log.info("No scheduler state found on path %s" % path)
+      return None
+
+    try:
+      with open(path, 'rb') as f:
+        return cPickle.load(f)
+    except PickleError as e:
+      raise self.Error('Failed to recover Scheduler: %s' % e)
+
+  def dump_cluster_state(self, state):
+    if not isinstance(state, MySQLCluster):
+      raise TypeError("'state' should be an instance of MySQLCluster")
+
+    path = self._get_cluster_state_path(state.name)
+    safe_mkdir(os.path.dirname(path))
+
+    try:
+      with open(path, 'wb') as f:
+        return cPickle.dump(state, f)
+    except PickleError as e:
+      raise self.Error('Failed to persist state for cluster %s: %s' % (state.name, e))
+
+  def load_cluster_state(self, cluster_name):
+    path = self._get_cluster_state_path(cluster_name)
+    if not os.path.isfile(path):
+      log.info("No cluster state found on path %s" % path)
+      return None
+
+    try:
+      with open(path, 'rb') as f:
+        return cPickle.load(f)
+    except PickleError as e:
+      raise self.Error('Failed to recover MySQLCluster: %s' % e)
+
+  @abstractmethod
+  def remove_cluster_state(self, cluster_name):
+    path = self._get_cluster_state_path(cluster_name)
+    if not os.path.isfile(path):
+      log.info("No cluster state found on path %s" % path)
+      return
+
+    os.remove(path)
+
+  # --- Helper methods. ---
+  def _get_scheduler_state_path(self):
+    return os.path.join(self._work_dir, os.path.join(*self._get_scheduler_state_key()))
+
+  def _get_cluster_state_path(self, cluster_name):
+    return os.path.join(self._work_dir, os.path.join(*self._get_cluster_state_key(cluster_name)))
diff --git a/twitter/mysos/scheduler/zk_state.py b/twitter/mysos/scheduler/zk_state.py
new file mode 100644
index 0000000..ca31980
--- /dev/null
+++ b/twitter/mysos/scheduler/zk_state.py
@@ -0,0 +1,100 @@
+import cPickle
+from cPickle import PickleError
+import posixpath
+
+from twitter.common import log
+
+from .state import MySQLCluster, Scheduler, StateProvider
+
+from kazoo.exceptions import KazooException, NoNodeError
+
+
+class ZooKeeperStateProvider(StateProvider):
+  """
+    StateProvider implementation backed by ZooKeeper.
+
+    This class is thread-safe.
+  """
+
+  def __init__(self, client, base_path):
+    """
+      :param client: Kazoo client.
+      :param base_path: The base path for the scheduler state on ZooKeeper.
+    """
+    self._client = client
+    self._base_path = base_path
+
+  def dump_scheduler_state(self, state):
+    if not isinstance(state, Scheduler):
+      raise TypeError("'state' should be an instance of Scheduler")
+
+    path = self._get_scheduler_state_path()
+    self._client.retry(self._client.ensure_path, posixpath.dirname(path))
+
+    content = cPickle.dumps(state)
+    try:
+      self._client.retry(self._create_or_set, path, content)
+    except KazooException as e:
+      raise self.Error('Failed to persist Scheduler: %s' % e)
+
+  def load_scheduler_state(self):
+    path = self._get_scheduler_state_path()
+
+    try:
+      content = self._client.get(path)[0]
+      state = cPickle.loads(content)
+      if not isinstance(state, Scheduler):
+        raise self.Error("Invalid state object. Expect Scheduler, got %s" % type(state))
+      return state
+    except NoNodeError:
+      log.info('No scheduler state found on path %s' % path)
+      return None
+    except (KazooException, PickleError, ValueError) as e:
+      raise self.Error('Failed to recover Scheduler: %s' % e)
+
+  def dump_cluster_state(self, state):
+    if not isinstance(state, MySQLCluster):
+      raise TypeError("'state' should be an instance of MySQLCluster")
+
+    path = self._get_cluster_state_path(state.name)
+    self._client.retry(self._client.ensure_path, posixpath.dirname(path))
+
+    content = cPickle.dumps(state)
+    self._client.retry(self._create_or_set, path, content)
+
+  def load_cluster_state(self, cluster_name):
+    path = self._get_cluster_state_path(cluster_name)
+
+    try:
+      content = self._client.get(path)[0]
+      state = cPickle.loads(content)
+      if not isinstance(state, MySQLCluster):
+        raise self.Error("Invalid state object. Expect MySQLCluster, got %s" % type(state))
+      return state
+    except NoNodeError:
+      log.info('No cluster state found on path %s' % path)
+      return None
+    except (KazooException, PickleError, ValueError) as e:
+      raise self.Error('Failed to recover MySQLCluster: %s' % e)
+
+  def remove_cluster_state(self, cluster_name):
+    path = self._get_cluster_state_path(cluster_name)
+    try:
+      self._client.retry(self._client.delete, path, recursive=True)
+    except KazooException as e:
+      raise self.Error("Failed to remove MySQLCluster: %s" % e)
+
+  # --- Helper methods. ---
+  def _get_scheduler_state_path(self):
+    return posixpath.join(self._base_path, posixpath.join(*self._get_scheduler_state_key()))
+
+  def _get_cluster_state_path(self, cluster_name):
+    return posixpath.join(
+        self._base_path, posixpath.join(*self._get_cluster_state_key(cluster_name)))
+
+  def _create_or_set(self, path, content):
+    """Set the ZNode if the path exists, otherwise create it."""
+    if self._client.exists(path):
+      self._client.set(path, content)
+    else:
+      self._client.create(path, content)
diff --git a/twitter/mysos/testing/__init__.py b/twitter/mysos/testing/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/twitter/mysos/testing/__init__.py
diff --git a/twitter/mysos/testing/mysos_test_client.py b/twitter/mysos/testing/mysos_test_client.py
new file mode 100755
index 0000000..59c1c9e
--- /dev/null
+++ b/twitter/mysos/testing/mysos_test_client.py
@@ -0,0 +1,178 @@
+from __future__ import print_function
+
+import BaseHTTPServer
+import json
+import os
+import tempfile
+import time
+import urllib
+import urllib2
+
+from twitter.common import app, log
+from twitter.common.dirutil import safe_mkdir
+from twitter.common.log.options import LogOptions
+from twitter.mysos.common.cluster import wait_for_master, wait_for_termination
+
+from sqlalchemy import create_engine
+from sqlalchemy.exc import OperationalError
+
+
+LogOptions.disable_disk_logging()
+LogOptions.set_stderr_log_level('google:INFO')
+
+
+app.add_option(
+    '--api_host',
+    dest='api_host',
+    help='Host for the HTTP API server')
+
+
+app.add_option(
+    '--api_port',
+    dest='api_port',
+    type='int',
+    help='Port for the HTTP API server')
+
+
+app.add_option(
+    '--cluster',
+    dest='cluster_name',
+    help='Name of the MySQL cluster to create')
+
+
+app.add_option(
+    '--password_file',
+    dest='password_file',
+    default=os.path.join(tempfile.gettempdir(), 'mysos', 'mysos_test_client', 'password_file'),
+    help="Path to the file for persisting the cluster password for testing purposes")
+
+
+def proxy_main():
+  @app.command
+  @app.command_option(
+      '--num_nodes',
+      dest='num_nodes',
+      type='int',
+      help='Number of nodes this cluster should have')
+  @app.command_option(
+      '--backup_id',
+      dest='backup_id',
+      default=None,
+      help="The 'backup_id' to restore from")
+  @app.command_option(
+      '--cluster_user',
+      dest='cluster_user',
+      help='MySQL user name the of cluster')
+  def create(args, options):
+    validate_common_options(options)
+
+    if not options.num_nodes:
+      app.error("--num_nodes is required")
+
+    if not options.cluster_user:
+      app.error("--cluster_user is required")
+
+    url = 'http://%s:%s/clusters/%s' % (options.api_host, options.api_port, options.cluster_name)
+    values = dict(
+        num_nodes=int(options.num_nodes),
+        cluster_user=options.cluster_user,
+        backup_id=options.backup_id if options.backup_id else '')
+
+    req = urllib2.Request(url, urllib.urlencode(values))
+    try:
+      response = urllib2.urlopen(req).read()
+    except urllib2.HTTPError as e:
+      log.error("POST request failed: %s, %s, %s" % (
+          e.code, BaseHTTPServer.BaseHTTPRequestHandler.responses[e.code], e.read()))
+      app.quit(1)
+
+    try:
+      result = json.loads(response)
+      if not isinstance(result, dict):
+        raise ValueError()
+    except ValueError:
+      log.error("Invalid response: %s" % response)
+      app.quit(1)
+
+    log.info("Cluster created. Cluster info: %s" % str(result))
+    with open(options.password_file, 'w') as f:
+      f.write(result["cluster_password"])
+
+    log.info("Waiting for the master for this cluster to be elected...")
+    master_endpoint = wait_for_master(result['cluster_url']).service_endpoint
+
+    connection_str = "mysql://%s:%s@%s:%d/" % (
+        options.cluster_user, result["cluster_password"], master_endpoint.host, master_endpoint.port)
+    log.info("Connecting to the MySQL cluster master: %s" % connection_str)
+    engine = create_engine(connection_str)
+
+    for i in range(5):  # Loop for 5 times/seconds to wait for the master to be promoted.
+      try:
+        # TODO(jyx): Test writing to the master and reading from the slave.
+        result = engine.execute("SELECT 1;").scalar()
+        assert 1 == int(result), "Expecting result to be 1 but got %s" % result
+        break
+      except OperationalError:
+        if i == 4:
+          raise
+        log.debug("MySQL master not ready yet. Sleep for 1 second...")
+        time.sleep(1)
+
+    log.info("Cluster successfully started")
+
+  @app.command
+  def delete(args, options):
+    validate_common_options(options)
+
+    with open(options.password_file, 'r') as f:
+      password = f.read().strip()
+      if not password:
+        app.error("Empty password file")
+
+    url = 'http://%s:%s/clusters/%s' % (options.api_host, options.api_port, options.cluster_name)
+    values = dict(password=password)
+
+    req = urllib2.Request(url, urllib.urlencode(values))
+    req.get_method = lambda: 'DELETE'
+
+    try:
+      response = urllib2.urlopen(req).read()
+    except urllib2.HTTPError as e:
+      log.error("DELETE request failed: %s, %s, %s" % (
+          e.code, BaseHTTPServer.BaseHTTPRequestHandler.responses[e.code], e.read()))
+      app.quit(1)
+
+    try:
+      result = json.loads(response)
+      if not isinstance(result, dict):
+        raise ValueError()
+    except ValueError:
+      log.error("Invalid response: %s" % response)
+      app.quit(1)
+
+    log.info("Cluster deletion result: %s" % result)
+
+    log.info("Waiting for the cluster to terminate...")
+    wait_for_termination(result['cluster_url'])
+
+    log.info("Cluster terminated/deleted")
+
+  def validate_common_options(options):
+    if not options.api_host:
+      app.error("--api_host is required")
+
+    if not options.api_port:
+      app.error("--api_port is required")
+
+    if not options.cluster_name:
+      app.error("--cluster is required")
+
+    if not options.password_file:
+      app.error("--password_file is required")
+    log.info("Using --password_file=%s" % options.password_file)
+    safe_mkdir(os.path.dirname(options.password_file))
+
+  def main(args, options):
+    app.help()
+
+  app.main()
diff --git a/vagrant/bin/mysos_executor.sh b/vagrant/bin/mysos_executor.sh
new file mode 100755
index 0000000..d9738f1
--- /dev/null
+++ b/vagrant/bin/mysos_executor.sh
@@ -0,0 +1,12 @@
+#!/bin/sh
+
+set -uex
+
+virtualenv venv  # Create vent in the sandbox.
+
+# Using python to run pip and vagrant_mysos_executor because the shebang in venv/bin/pip can
+# exceed system limit and cannot be executed directly.
+venv/bin/python venv/bin/pip install --find-links /home/vagrant/mysos/deps mesos.native
+venv/bin/python venv/bin/pip install --pre --find-links . mysos
+
+venv/bin/python venv/bin/vagrant_mysos_executor
diff --git a/vagrant/bin/mysos_scheduler.sh b/vagrant/bin/mysos_scheduler.sh
new file mode 100755
index 0000000..e8148af
--- /dev/null
+++ b/vagrant/bin/mysos_scheduler.sh
@@ -0,0 +1,27 @@
+#!/bin/sh
+
+set -uex
+
+TMPDIR=$(mktemp -d)
+
+virtualenv $TMPDIR  # Create venv under /tmp.
+$TMPDIR/bin/pip install --find-links /home/vagrant/mysos/deps mesos.native
+$TMPDIR/bin/pip install --pre --find-links /home/vagrant/mysos/dist mysos
+
+ZK_HOST=192.168.33.17
+API_PORT=55001
+
+# NOTE: In --executor_environ we are pointing MYSOS_DEFAULTS_FILE to an empty MySQL defaults file.
+# The file 'my5.6.cnf' is pre-installed by the 'mysql-server-5.6' package on the VM.
+$TMPDIR/bin/mysos_scheduler \
+    --port=$API_PORT \
+    --framework_user=vagrant \
+    --mesos_master=zk://$ZK_HOST:2181/mesos/master \
+    --executor_uri=/home/vagrant/mysos/dist/mysos-0.1.0-dev0.zip \
+    --executor_cmd=/home/vagrant/mysos/vagrant/bin/mysos_executor.sh \
+    --zk_url=zk://$ZK_HOST:2181/mysos \
+    --admin_keypath=/home/vagrant/mysos/vagrant/etc/admin_keyfile.yml \
+    --framework_failover_timeout=1m \
+    --framework_role=mysos \
+    --framework_authentication_file=/home/vagrant/mysos/vagrant/etc/fw_auth_keyfile.yml \
+    --executor_environ='[{"name": "MYSOS_DEFAULTS_FILE", "value": "/etc/mysql/conf.d/my5.6.cnf"}]'
diff --git a/vagrant/etc/admin_keyfile.yml b/vagrant/etc/admin_keyfile.yml
new file mode 100644
index 0000000..013be28
--- /dev/null
+++ b/vagrant/etc/admin_keyfile.yml
@@ -0,0 +1,2 @@
+username: sys.mysos.0
+password: testpassword
\ No newline at end of file
diff --git a/vagrant/etc/framework_keys.txt b/vagrant/etc/framework_keys.txt
new file mode 100644
index 0000000..66ec943
--- /dev/null
+++ b/vagrant/etc/framework_keys.txt
@@ -0,0 +1 @@
+mysos testpassword
\ No newline at end of file
diff --git a/vagrant/etc/fw_auth_keyfile.yml b/vagrant/etc/fw_auth_keyfile.yml
new file mode 100644
index 0000000..321d396
--- /dev/null
+++ b/vagrant/etc/fw_auth_keyfile.yml
@@ -0,0 +1,2 @@
+principal: mysos
+secret: testpassword
\ No newline at end of file
diff --git a/vagrant/provision-dev-cluster.sh b/vagrant/provision-dev-cluster.sh
new file mode 100755
index 0000000..d8390cf
--- /dev/null
+++ b/vagrant/provision-dev-cluster.sh
@@ -0,0 +1,71 @@
+#!/bin/bash -x
+
+# This script requires mysos binaries to be built. Run `tox` first.
+
+# Install dependencies.
+export DEBIAN_FRONTEND=noninteractive
+aptitude update -q
+aptitude install -q -y -o Dpkg::Options::="--force-confdef" -o Dpkg::Options::="--force-confold" \
+    libcurl3-dev \
+    libsasl2-dev \
+    python-dev \
+    zookeeper \
+    mysql-server-5.6 \
+    libmysqlclient-dev \
+    libunwind8 \
+    python-virtualenv \
+    bison flex  # For libnl.
+
+# Fix up a dependency issue of Mesos egg: _mesos.so links to libunwind.so.7 but Trusty only has
+# libunwind.so.8.
+ln -sf /usr/lib/x86_64-linux-gnu/libunwind.so.8 /usr/lib/x86_64-linux-gnu/libunwind.so.7
+
+# Fix up Ubuntu mysql-server-5.6 issue: mysql_install_db looks for this file even if we don't need
+# it.
+ln -sf /usr/share/doc/mysql-server-5.6/examples/my-default.cnf /usr/share/mysql/my-default.cnf
+
+# Set the hostname to the IP address. This simplifies things for components that want to advertise
+# the hostname to the user, or other components.
+hostname 192.168.33.17
+
+# Install an update-mysos tool to sync mysos binaries and configs into the VM.
+cat > /usr/local/bin/update-mysos <<EOF
+#!/bin/bash
+mkdir -p /home/vagrant/mysos
+rsync -urzvh /vagrant/vagrant/ /home/vagrant/mysos/vagrant/ --delete
+rsync -urzvh /vagrant/.tox/dist/ /home/vagrant/mysos/dist/ --delete
+rsync -urzvh /vagrant/3rdparty/ /home/vagrant/mysos/3rdparty/ --delete
+
+# Install the upstart configurations.
+sudo cp /home/vagrant/mysos/vagrant/upstart/*.conf /etc/init
+chown -R vagrant:vagrant /home/vagrant/mysos
+EOF
+chmod +x /usr/local/bin/update-mysos
+sudo -u vagrant update-mysos
+
+# Install Mesos.
+MESOS_VERSION=0.20.1
+UBUNTU_YEAR=14
+UBUNTU_MONTH=04
+
+mkdir -p /home/vagrant/mysos/deps
+pushd /home/vagrant/mysos/deps
+if [ ! -f mesos_${MESOS_VERSION}-1.0.ubuntu${UBUNTU_YEAR}${UBUNTU_MONTH}_amd64.deb ]; then
+    curl --silent --output mesos_${MESOS_VERSION}-1.0.ubuntu${UBUNTU_YEAR}${UBUNTU_MONTH}_amd64.deb \
+        http://downloads.mesosphere.io/master/ubuntu/${UBUNTU_YEAR}.${UBUNTU_MONTH}/mesos_${MESOS_VERSION}-1.0.ubuntu${UBUNTU_YEAR}${UBUNTU_MONTH}_amd64.deb
+    dpkg --install --force-confdef --force-confold \
+        /home/vagrant/mysos/deps/mesos_${MESOS_VERSION}-1.0.ubuntu${UBUNTU_YEAR}${UBUNTU_MONTH}_amd64.deb
+fi
+
+if [ ! -f mesos.native-${MESOS_VERSION}-cp27-none-linux_x86_64.whl ]; then
+    # NOTE: We rename the output file here so the egg is properly named.
+    curl --silent --output mesos.native-${MESOS_VERSION}-py2.7-linux-x86_64.egg http://downloads.mesosphere.io/master/ubuntu/${UBUNTU_YEAR}.${UBUNTU_MONTH}/mesos-${MESOS_VERSION}-py2.7-linux-x86_64.egg
+    python -m wheel convert mesos.native-${MESOS_VERSION}-py2.7-linux-x86_64.egg
+fi
+popd
+
+# (Re)start services with new conf.
+stop zookeeper ; start zookeeper
+stop mesos-master ; start mesos-master
+stop mesos-slave ; start mesos-slave
+stop mysos ; start mysos
diff --git a/vagrant/test.sh b/vagrant/test.sh
new file mode 100755
index 0000000..a0b69c9
--- /dev/null
+++ b/vagrant/test.sh
@@ -0,0 +1,35 @@
+#!/bin/sh
+
+# This is an 'end-to-end' test that requires Mysos to be up and running in the Vagrant VM.
+
+set -ue
+
+host="192.168.33.17"
+port=55001
+cluster_name="test_cluster$((RANDOM % 1000))"
+num_nodes=1
+cluster_user="mysos"
+
+HERE="$(cd "$(dirname "$0")" && pwd)"
+executable=$HERE/../.tox/py27/bin/mysos_test_client
+
+if [ ! -f ${executable} ]; then
+  echo "${executable} doesn't exist. Build it first."
+  exit 1
+fi
+
+${executable} create \
+  --api_host=${host} \
+  --api_port=${port} \
+  --cluster_user=${cluster_user} \
+  --cluster=${cluster_name} \
+  --num_nodes=${num_nodes}
+
+echo "Finished creating the cluster, now deleting it"
+
+${executable} delete \
+  --api_host=${host} \
+  --api_port=${port} \
+  --cluster=${cluster_name}
+
+echo "Finished deleting the cluster"
diff --git a/vagrant/upstart/mesos-master.conf b/vagrant/upstart/mesos-master.conf
new file mode 100644
index 0000000..4dee7e7
--- /dev/null
+++ b/vagrant/upstart/mesos-master.conf
@@ -0,0 +1,17 @@
+description "mesos master"
+start on stopped rc RUNLEVEL=[2345]
+respawn
+post-stop exec sleep 5
+
+env MY_HOST=192.168.33.17
+env ZK_HOST=192.168.33.17
+
+exec /usr/local/sbin/mesos-master \
+    --zk=zk://$ZK_HOST:2181/mesos/master \
+    --ip=$MY_HOST \
+    --work_dir=/var/local/mesos/master/db \
+    --quorum=1 \
+    --roles=mysos \
+    --credentials=/home/vagrant/mysos/vagrant/etc/framework_keys.txt
+
+console log
diff --git a/vagrant/upstart/mesos-slave.conf b/vagrant/upstart/mesos-slave.conf
new file mode 100644
index 0000000..1f7b6d9
--- /dev/null
+++ b/vagrant/upstart/mesos-slave.conf
@@ -0,0 +1,17 @@
+description "mesos slave"
+start on stopped rc RUNLEVEL=[2345]
+respawn
+post-stop exec sleep 5
+
+env MY_HOST=192.168.33.17
+env ZK_HOST=192.168.33.17
+
+exec /usr/local/sbin/mesos-slave \
+    --master=zk://$ZK_HOST:2181/mesos/master \
+    --ip=$MY_HOST \
+    --hostname=$MY_HOST \
+    --resources="cpus(mysos):4;mem(mysos):1024;disk(mysos):20000;ports(mysos):[31000-32000]" \
+    --isolation="cgroups/cpu,cgroups/mem" \
+    --cgroups_enable_cfs
+
+console log
diff --git a/vagrant/upstart/mysos.conf b/vagrant/upstart/mysos.conf
new file mode 100644
index 0000000..6205e10
--- /dev/null
+++ b/vagrant/upstart/mysos.conf
@@ -0,0 +1,8 @@
+description "mysos"
+start on stopped rc RUNLEVEL=[2345]
+respawn
+post-stop exec sleep 5
+
+exec /home/vagrant/mysos/vagrant/bin/mysos_scheduler.sh
+
+console log
diff --git a/vagrant/upstart/zookeeper.conf b/vagrant/upstart/zookeeper.conf
new file mode 100644
index 0000000..9e666bc
--- /dev/null
+++ b/vagrant/upstart/zookeeper.conf
@@ -0,0 +1,10 @@
+description "zookeeper"
+start on stopped rc RUNLEVEL=[2345]
+respawn
+post-stop exec sleep 5
+
+env JVMFLAGS='-Djava.net.preferIPv4Stack=true'
+
+exec /usr/share/zookeeper/bin/zkServer.sh start-foreground
+
+console log