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 Release Notes for Apache Helix 0.6.2-incubating
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Release Notes for Apache Helix 0.6.2-incubating

  The Apache Helix team would like to announce the release of Apache Helix 0.6.2-incubating

  This is the third release under the Apache umbrella.

  Helix is a generic cluster management framework used for the automatic management of partitioned, replicated and distributed resources hosted on a cluster of nodes. Helix provides the following features:

  * Automatic assignment of resource/partition to nodes

  * Node failure detection and recovery

  * Dynamic addition of Resources

  * Dynamic addition of nodes to the cluster

  * Pluggable distributed state machine to manage the state of a resource via state transitions

  * Automatic load balancing and throttling of transitions

  []

* Changes

** Sub-task

  * [HELIX-28] - ZkHelixManager.handleNewSession() can happen when a liveinstance already exists

  * [HELIX-85] - Remove mock service module

  * [HELIX-106] - Remove all string constants in the code

  * [HELIX-107] - Add support to set custom objects into ZNRecord

  * [HELIX-124] - race condition in ZkHelixManager.handleNewSession()

  * [HELIX-165] - Add dependency for Guava libraries

  * [HELIX-169] - Take care of consecutive handleNewSession() and session expiry during handleNewSession() 

  * [HELIX-170] - HelixManager#isLeader() should compare both instanceName and sessionId 

  * [HELIX-195] - Race condition between FINALIZE callbacks and Zk Callbacks

  * [HELIX-207] - Add javadocs to classes and public methods in the top-level package

  * [HELIX-208] - Add javadocs to classes and public methods in the model package

  * [HELIX-277] - FULL_AUTO rebalancer should not prefer nodes that are just coming up

** Bug

  * [HELIX-7] - Tune test parameters to fix random test failures

  * [HELIX-87] - Bad repository links in website

  * [HELIX-117] - backward incompatibility problem in accessing zkPath vis HelixWebAdmin

  * [HELIX-118] - PropertyStore -> HelixPropertyStore backwards incompatible location

  * [HELIX-119] - HelixManager serializer no longer needs ByteArraySerializer for /PROPERTYSTORE

  * [HELIX-129] - ZKDumper should use byte[] instead of String to read/write file/zk

  * [HELIX-131] - Connection timeout not set while connecting to zookeeper via zkHelixAdmin

  * [HELIX-133] - Cluster-admin command parsing does not work with removeConfig

  * [HELIX-140] - In ClusterSetup.java, the removeConfig is wrong wired to getConfig

  * [HELIX-141] - Autorebalance does not work reliably and fails when replica>1

  * [HELIX-144] - Need to validate StateModelDefinition when adding new StateModelDefinition to Cluster

  * [HELIX-147] - Fix typo in Idealstate property max_partitions_per_instance

  * [HELIX-148] - Current preferred placement for auto rebalace is suboptimal for n > p

  * [HELIX-150] - Auto rebalance might not evenly distribute states across nodes

  * [HELIX-151] - Auto rebalance doesn't assign some replicas when other nodes could make room

  * [HELIX-153] - Auto rebalance tester uses the returned map fields, but production uses only list fields

  * [HELIX-155] - PropertyKey.instances() is wrongly wired to CONFIG type instead of INSTANCES type

  * [HELIX-197] - state model leak

  * [HELIX-199] - ZNRecord should not publish rawPayload unless it exists

  * [HELIX-216] - Allow HelixAdmin addResource to accept the old rebalancing types

  * [HELIX-221] - Can't find default error->dropped transition method using name convention

  * [HELIX-257] - Upgrade Restlet to 2.1.4 - due security flaw

  * [HELIX-258] - Upgrade Apache Camel due to CVE-2013-4330

  * [HELIX-264] - fix zkclient#close() bug

  * [HELIX-279] - Apply gc handling fixes to main ZKHelixManager class

  * [HELIX-280] - Full auto rebalancer should check for resource tag first

  * [HELIX-288] - helix-core uses an old version of guava

  * [HELIX-299] - Some files in 0.6.2 are missing license headers

** Improvement

  * [HELIX-20] - AUTO-REBALANCE helix controller should re-assign disabled partitions on a node to other available nodes

  * [HELIX-70] - Make Helix OSGi ready

  * [HELIX-149] - Allow clients to pass in preferred placement strategies

  * [HELIX-198] - Unify helix code style

  * [HELIX-218] - Add a reviewboard submission script

  * [HELIX-284] - Support participant auto join in YAML cluster setup

** New Feature

  * [HELIX-215] - Allow setting up the cluster with a YAML file

** Task

  * [HELIX-95] - Tracker for 0.6.2 release

  * [HELIX-154] - Auto rebalance algorithm should not depend on state

  * [HELIX-166] - Rename modes to auto, semi-auto, and custom

  * [HELIX-173] - Move rebalancing strategies to separate classes that implement the Rebalancer interface

  * [HELIX-188] - Add admin command line / REST API documentations

  * [HELIX-194] - ZNRecord has too many constructors

  * [HELIX-205] - Have user-defined rebalancers use RebalanceMode.USER_DEFINED

  * [HELIX-210] - Add support to set data with expect version in BaseDataAccessor

  * [HELIX-217] - Remove mock service module

  * [HELIX-273] - Rebalancer interface should remain unchanged in 0.6.2

  * [HELIX-274] - Verify FULL_AUTO tagged node behavior

  * [HELIX-285] - add integration test util's

  []

  Cheers,
  --
  The Apache Helix Team