| /** |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.hadoop.hbase.master; |
| |
| import static org.junit.Assert.assertFalse; |
| import static org.junit.Assert.assertNotNull; |
| import static org.junit.Assert.assertTrue; |
| |
| import java.io.IOException; |
| import java.util.concurrent.Semaphore; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.hbase.ChoreService; |
| import org.apache.hadoop.hbase.CoordinatedStateManager; |
| import org.apache.hadoop.hbase.HBaseTestingUtility; |
| import org.apache.hadoop.hbase.Server; |
| import org.apache.hadoop.hbase.ServerName; |
| import org.apache.hadoop.hbase.client.ClusterConnection; |
| import org.apache.hadoop.hbase.monitoring.MonitoredTask; |
| import org.apache.hadoop.hbase.testclassification.MasterTests; |
| import org.apache.hadoop.hbase.testclassification.MediumTests; |
| import org.apache.hadoop.hbase.zookeeper.ClusterStatusTracker; |
| import org.apache.hadoop.hbase.zookeeper.MasterAddressTracker; |
| import org.apache.hadoop.hbase.zookeeper.MetaTableLocator; |
| import org.apache.hadoop.hbase.zookeeper.ZKUtil; |
| import org.apache.hadoop.hbase.zookeeper.ZooKeeperListener; |
| import org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher; |
| import org.apache.zookeeper.KeeperException; |
| import org.junit.AfterClass; |
| import org.junit.BeforeClass; |
| import org.junit.Test; |
| import org.junit.experimental.categories.Category; |
| import org.mockito.Mockito; |
| |
| /** |
| * Test the {@link ActiveMasterManager}. |
| */ |
| @Category({MasterTests.class, MediumTests.class}) |
| public class TestActiveMasterManager { |
| private final static Log LOG = LogFactory.getLog(TestActiveMasterManager.class); |
| private final static HBaseTestingUtility TEST_UTIL = new HBaseTestingUtility(); |
| |
| @BeforeClass |
| public static void setUpBeforeClass() throws Exception { |
| TEST_UTIL.startMiniZKCluster(); |
| } |
| |
| @AfterClass |
| public static void tearDownAfterClass() throws Exception { |
| TEST_UTIL.shutdownMiniZKCluster(); |
| } |
| |
| @Test public void testRestartMaster() throws IOException, KeeperException { |
| ZooKeeperWatcher zk = new ZooKeeperWatcher(TEST_UTIL.getConfiguration(), |
| "testActiveMasterManagerFromZK", null, true); |
| try { |
| ZKUtil.deleteNode(zk, zk.getMasterAddressZNode()); |
| ZKUtil.deleteNode(zk, zk.clusterStateZNode); |
| } catch(KeeperException.NoNodeException nne) {} |
| |
| // Create the master node with a dummy address |
| ServerName master = ServerName.valueOf("localhost", 1, System.currentTimeMillis()); |
| // Should not have a master yet |
| DummyMaster dummyMaster = new DummyMaster(zk,master); |
| ClusterStatusTracker clusterStatusTracker = |
| dummyMaster.getClusterStatusTracker(); |
| ActiveMasterManager activeMasterManager = |
| dummyMaster.getActiveMasterManager(); |
| assertFalse(activeMasterManager.clusterHasActiveMaster.get()); |
| |
| // First test becoming the active master uninterrupted |
| MonitoredTask status = Mockito.mock(MonitoredTask.class); |
| clusterStatusTracker.setClusterUp(); |
| |
| activeMasterManager.blockUntilBecomingActiveMaster(100, status); |
| assertTrue(activeMasterManager.clusterHasActiveMaster.get()); |
| assertMaster(zk, master); |
| |
| // Now pretend master restart |
| DummyMaster secondDummyMaster = new DummyMaster(zk,master); |
| ActiveMasterManager secondActiveMasterManager = |
| secondDummyMaster.getActiveMasterManager(); |
| assertFalse(secondActiveMasterManager.clusterHasActiveMaster.get()); |
| activeMasterManager.blockUntilBecomingActiveMaster(100, status); |
| assertTrue(activeMasterManager.clusterHasActiveMaster.get()); |
| assertMaster(zk, master); |
| } |
| |
| /** |
| * Unit tests that uses ZooKeeper but does not use the master-side methods |
| * but rather acts directly on ZK. |
| * @throws Exception |
| */ |
| @Test |
| public void testActiveMasterManagerFromZK() throws Exception { |
| ZooKeeperWatcher zk = new ZooKeeperWatcher(TEST_UTIL.getConfiguration(), |
| "testActiveMasterManagerFromZK", null, true); |
| try { |
| ZKUtil.deleteNode(zk, zk.getMasterAddressZNode()); |
| ZKUtil.deleteNode(zk, zk.clusterStateZNode); |
| } catch(KeeperException.NoNodeException nne) {} |
| |
| // Create the master node with a dummy address |
| ServerName firstMasterAddress = |
| ServerName.valueOf("localhost", 1, System.currentTimeMillis()); |
| ServerName secondMasterAddress = |
| ServerName.valueOf("localhost", 2, System.currentTimeMillis()); |
| |
| // Should not have a master yet |
| DummyMaster ms1 = new DummyMaster(zk,firstMasterAddress); |
| ActiveMasterManager activeMasterManager = |
| ms1.getActiveMasterManager(); |
| assertFalse(activeMasterManager.clusterHasActiveMaster.get()); |
| |
| // First test becoming the active master uninterrupted |
| ClusterStatusTracker clusterStatusTracker = |
| ms1.getClusterStatusTracker(); |
| clusterStatusTracker.setClusterUp(); |
| activeMasterManager.blockUntilBecomingActiveMaster(100, |
| Mockito.mock(MonitoredTask.class)); |
| assertTrue(activeMasterManager.clusterHasActiveMaster.get()); |
| assertMaster(zk, firstMasterAddress); |
| |
| // New manager will now try to become the active master in another thread |
| WaitToBeMasterThread t = new WaitToBeMasterThread(zk, secondMasterAddress); |
| t.start(); |
| // Wait for this guy to figure out there is another active master |
| // Wait for 1 second at most |
| int sleeps = 0; |
| while(!t.manager.clusterHasActiveMaster.get() && sleeps < 100) { |
| Thread.sleep(10); |
| sleeps++; |
| } |
| |
| // Both should see that there is an active master |
| assertTrue(activeMasterManager.clusterHasActiveMaster.get()); |
| assertTrue(t.manager.clusterHasActiveMaster.get()); |
| // But secondary one should not be the active master |
| assertFalse(t.isActiveMaster); |
| |
| // Close the first server and delete it's master node |
| ms1.stop("stopping first server"); |
| |
| // Use a listener to capture when the node is actually deleted |
| NodeDeletionListener listener = new NodeDeletionListener(zk, zk.getMasterAddressZNode()); |
| zk.registerListener(listener); |
| |
| LOG.info("Deleting master node"); |
| ZKUtil.deleteNode(zk, zk.getMasterAddressZNode()); |
| |
| // Wait for the node to be deleted |
| LOG.info("Waiting for active master manager to be notified"); |
| listener.waitForDeletion(); |
| LOG.info("Master node deleted"); |
| |
| // Now we expect the secondary manager to have and be the active master |
| // Wait for 1 second at most |
| sleeps = 0; |
| while(!t.isActiveMaster && sleeps < 100) { |
| Thread.sleep(10); |
| sleeps++; |
| } |
| LOG.debug("Slept " + sleeps + " times"); |
| |
| assertTrue(t.manager.clusterHasActiveMaster.get()); |
| assertTrue(t.isActiveMaster); |
| |
| LOG.info("Deleting master node"); |
| ZKUtil.deleteNode(zk, zk.getMasterAddressZNode()); |
| } |
| |
| /** |
| * Assert there is an active master and that it has the specified address. |
| * @param zk |
| * @param thisMasterAddress |
| * @throws KeeperException |
| * @throws IOException |
| */ |
| private void assertMaster(ZooKeeperWatcher zk, |
| ServerName expectedAddress) |
| throws KeeperException, IOException { |
| ServerName readAddress = MasterAddressTracker.getMasterAddress(zk); |
| assertNotNull(readAddress); |
| assertTrue(expectedAddress.equals(readAddress)); |
| } |
| |
| public static class WaitToBeMasterThread extends Thread { |
| |
| ActiveMasterManager manager; |
| DummyMaster dummyMaster; |
| boolean isActiveMaster; |
| |
| public WaitToBeMasterThread(ZooKeeperWatcher zk, ServerName address) { |
| this.dummyMaster = new DummyMaster(zk,address); |
| this.manager = this.dummyMaster.getActiveMasterManager(); |
| isActiveMaster = false; |
| } |
| |
| @Override |
| public void run() { |
| manager.blockUntilBecomingActiveMaster(100, |
| Mockito.mock(MonitoredTask.class)); |
| LOG.info("Second master has become the active master!"); |
| isActiveMaster = true; |
| } |
| } |
| |
| public static class NodeDeletionListener extends ZooKeeperListener { |
| private static final Log LOG = LogFactory.getLog(NodeDeletionListener.class); |
| |
| private Semaphore lock; |
| private String node; |
| |
| public NodeDeletionListener(ZooKeeperWatcher watcher, String node) { |
| super(watcher); |
| lock = new Semaphore(0); |
| this.node = node; |
| } |
| |
| @Override |
| public void nodeDeleted(String path) { |
| if(path.equals(node)) { |
| LOG.debug("nodeDeleted(" + path + ")"); |
| lock.release(); |
| } |
| } |
| |
| public void waitForDeletion() throws InterruptedException { |
| lock.acquire(); |
| } |
| } |
| |
| /** |
| * Dummy Master Implementation. |
| */ |
| public static class DummyMaster implements Server { |
| private volatile boolean stopped; |
| private ClusterStatusTracker clusterStatusTracker; |
| private ActiveMasterManager activeMasterManager; |
| |
| public DummyMaster(ZooKeeperWatcher zk, ServerName master) { |
| this.clusterStatusTracker = |
| new ClusterStatusTracker(zk, this); |
| clusterStatusTracker.start(); |
| |
| this.activeMasterManager = |
| new ActiveMasterManager(zk, master, this); |
| zk.registerListener(activeMasterManager); |
| } |
| |
| @Override |
| public void abort(final String msg, final Throwable t) {} |
| |
| @Override |
| public boolean isAborted() { |
| return false; |
| } |
| |
| @Override |
| public Configuration getConfiguration() { |
| return null; |
| } |
| |
| @Override |
| public ZooKeeperWatcher getZooKeeper() { |
| return null; |
| } |
| |
| @Override |
| public CoordinatedStateManager getCoordinatedStateManager() { |
| return null; |
| } |
| |
| @Override |
| public ServerName getServerName() { |
| return null; |
| } |
| |
| @Override |
| public boolean isStopped() { |
| return this.stopped; |
| } |
| |
| @Override |
| public void stop(String why) { |
| this.stopped = true; |
| } |
| |
| @Override |
| public ClusterConnection getConnection() { |
| return null; |
| } |
| |
| @Override |
| public MetaTableLocator getMetaTableLocator() { |
| return null; |
| } |
| |
| public ClusterStatusTracker getClusterStatusTracker() { |
| return clusterStatusTracker; |
| } |
| |
| public ActiveMasterManager getActiveMasterManager() { |
| return activeMasterManager; |
| } |
| |
| @Override |
| public ChoreService getChoreService() { |
| return null; |
| } |
| |
| @Override |
| public ClusterConnection getClusterConnection() { |
| // TODO Auto-generated method stub |
| return null; |
| } |
| } |
| } |