| /** |
| * 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.regionserver; |
| |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertFalse; |
| import static org.junit.Assert.assertNull; |
| import static org.junit.Assert.assertTrue; |
| |
| import java.util.List; |
| import java.util.concurrent.Semaphore; |
| import org.apache.hadoop.hbase.HBaseClassTestRule; |
| import org.apache.hadoop.hbase.HBaseTestingUtility; |
| import org.apache.hadoop.hbase.ServerName; |
| import org.apache.hadoop.hbase.testclassification.MediumTests; |
| import org.apache.hadoop.hbase.testclassification.RegionServerTests; |
| import org.apache.hadoop.hbase.zookeeper.MasterAddressTracker; |
| import org.apache.hadoop.hbase.zookeeper.ZKListener; |
| import org.apache.hadoop.hbase.zookeeper.ZKUtil; |
| import org.apache.hadoop.hbase.zookeeper.ZKWatcher; |
| import org.apache.hadoop.hbase.zookeeper.ZNodePaths; |
| import org.junit.After; |
| import org.junit.AfterClass; |
| import org.junit.BeforeClass; |
| import org.junit.ClassRule; |
| import org.junit.Rule; |
| import org.junit.Test; |
| import org.junit.experimental.categories.Category; |
| import org.junit.rules.TestName; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| @Category({RegionServerTests.class, MediumTests.class}) |
| public class TestMasterAddressTracker { |
| |
| @ClassRule |
| public static final HBaseClassTestRule CLASS_RULE = |
| HBaseClassTestRule.forClass(TestMasterAddressTracker.class); |
| |
| private static final Logger LOG = LoggerFactory.getLogger(TestMasterAddressTracker.class); |
| |
| private final static HBaseTestingUtility TEST_UTIL = new HBaseTestingUtility(); |
| // Cleaned up after each unit test. |
| private static ZKWatcher zk; |
| |
| @Rule |
| public TestName name = new TestName(); |
| |
| @After |
| public void cleanUp() { |
| if (zk != null) { |
| zk.close(); |
| } |
| } |
| |
| @BeforeClass |
| public static void setUpBeforeClass() throws Exception { |
| TEST_UTIL.startMiniZKCluster(); |
| } |
| |
| @AfterClass |
| public static void tearDownAfterClass() throws Exception { |
| TEST_UTIL.shutdownMiniZKCluster(); |
| } |
| |
| @Test |
| public void testDeleteIfEquals() throws Exception { |
| final ServerName sn = ServerName.valueOf("localhost", 1234, System.currentTimeMillis()); |
| final MasterAddressTracker addressTracker = setupMasterTracker(sn, 1772); |
| try { |
| assertFalse("shouldn't have deleted wrong master server.", |
| MasterAddressTracker.deleteIfEquals(addressTracker.getWatcher(), "some other string.")); |
| } finally { |
| assertTrue("Couldn't clean up master", |
| MasterAddressTracker.deleteIfEquals(addressTracker.getWatcher(), sn.toString())); |
| } |
| } |
| |
| /** |
| * create an address tracker instance |
| * @param sn if not-null set the active master |
| * @param infoPort if there is an active master, set its info port. |
| */ |
| private MasterAddressTracker setupMasterTracker(final ServerName sn, final int infoPort) |
| throws Exception { |
| zk = new ZKWatcher(TEST_UTIL.getConfiguration(), |
| name.getMethodName(), null); |
| ZKUtil.createAndFailSilent(zk, zk.getZNodePaths().baseZNode); |
| ZKUtil.createAndFailSilent(zk, zk.getZNodePaths().backupMasterAddressesZNode); |
| |
| // Should not have a master yet |
| MasterAddressTracker addressTracker = new MasterAddressTracker(zk, null); |
| addressTracker.start(); |
| assertFalse(addressTracker.hasMaster()); |
| zk.registerListener(addressTracker); |
| |
| // Use a listener to capture when the node is actually created |
| NodeCreationListener listener = new NodeCreationListener(zk, |
| zk.getZNodePaths().masterAddressZNode); |
| zk.registerListener(listener); |
| |
| if (sn != null) { |
| LOG.info("Creating master node"); |
| MasterAddressTracker.setMasterAddress(zk, zk.getZNodePaths().masterAddressZNode, |
| sn, infoPort); |
| |
| // Wait for the node to be created |
| LOG.info("Waiting for master address manager to be notified"); |
| listener.waitForCreation(); |
| LOG.info("Master node created"); |
| } |
| return addressTracker; |
| } |
| |
| /** |
| * Unit tests that uses ZooKeeper but does not use the master-side methods |
| * but rather acts directly on ZK. |
| * @throws Exception |
| */ |
| @Test |
| public void testMasterAddressTrackerFromZK() throws Exception { |
| // Create the master node with a dummy address |
| final int infoPort = 1235; |
| final ServerName sn = ServerName.valueOf("localhost", 1234, System.currentTimeMillis()); |
| final MasterAddressTracker addressTracker = setupMasterTracker(sn, infoPort); |
| try { |
| assertTrue(addressTracker.hasMaster()); |
| ServerName pulledAddress = addressTracker.getMasterAddress(); |
| assertTrue(pulledAddress.equals(sn)); |
| assertEquals(infoPort, addressTracker.getMasterInfoPort()); |
| } finally { |
| assertTrue("Couldn't clean up master", |
| MasterAddressTracker.deleteIfEquals(addressTracker.getWatcher(), sn.toString())); |
| } |
| } |
| |
| |
| @Test |
| public void testParsingNull() throws Exception { |
| assertNull("parse on null data should return null.", MasterAddressTracker.parse(null)); |
| } |
| |
| @Test |
| public void testNoBackups() throws Exception { |
| final ServerName sn = ServerName.valueOf("localhost", 1234, System.currentTimeMillis()); |
| final MasterAddressTracker addressTracker = setupMasterTracker(sn, 1772); |
| try { |
| assertEquals("Should receive 0 for backup not found.", 0, |
| addressTracker.getBackupMasterInfoPort( |
| ServerName.valueOf("doesnotexist.example.com", 1234, System.currentTimeMillis()))); |
| } finally { |
| assertTrue("Couldn't clean up master", |
| MasterAddressTracker.deleteIfEquals(addressTracker.getWatcher(), sn.toString())); |
| } |
| } |
| |
| @Test |
| public void testNoMaster() throws Exception { |
| final MasterAddressTracker addressTracker = setupMasterTracker(null, 1772); |
| assertFalse(addressTracker.hasMaster()); |
| assertNull("should get null master when none active.", addressTracker.getMasterAddress()); |
| assertEquals("Should receive 0 for backup not found.", 0, addressTracker.getMasterInfoPort()); |
| } |
| |
| @Test |
| public void testBackupMasters() throws Exception { |
| final ServerName sn = ServerName.valueOf("localhost", 5678, System.currentTimeMillis()); |
| final MasterAddressTracker addressTracker = setupMasterTracker(sn, 1111); |
| assertTrue(addressTracker.hasMaster()); |
| ServerName activeMaster = addressTracker.getMasterAddress(); |
| assertEquals(activeMaster, sn); |
| // No current backup masters |
| List<ServerName> backupMasters = addressTracker.getBackupMasters(); |
| assertEquals(0, backupMasters.size()); |
| ServerName backupMaster1 = ServerName.valueOf("localhost", 2222, -1); |
| ServerName backupMaster2 = ServerName.valueOf("localhost", 3333, -1); |
| String backupZNode1 = ZNodePaths.joinZNode( |
| zk.getZNodePaths().backupMasterAddressesZNode, backupMaster1.toString()); |
| String backupZNode2 = ZNodePaths.joinZNode( |
| zk.getZNodePaths().backupMasterAddressesZNode, backupMaster2.toString()); |
| // Add a backup master |
| MasterAddressTracker.setMasterAddress(zk, backupZNode1, backupMaster1, 2222); |
| MasterAddressTracker.setMasterAddress(zk, backupZNode2, backupMaster2, 3333); |
| backupMasters = addressTracker.getBackupMasters(); |
| assertEquals(2, backupMasters.size()); |
| assertTrue(backupMasters.contains(backupMaster1)); |
| assertTrue(backupMasters.contains(backupMaster2)); |
| } |
| |
| public static class NodeCreationListener extends ZKListener { |
| private static final Logger LOG = LoggerFactory.getLogger(NodeCreationListener.class); |
| |
| private Semaphore lock; |
| private String node; |
| |
| public NodeCreationListener(ZKWatcher watcher, String node) { |
| super(watcher); |
| lock = new Semaphore(0); |
| this.node = node; |
| } |
| |
| @Override |
| public void nodeCreated(String path) { |
| if(path.equals(node)) { |
| LOG.debug("nodeCreated(" + path + ")"); |
| lock.release(); |
| } |
| } |
| |
| public void waitForCreation() throws InterruptedException { |
| lock.acquire(); |
| } |
| } |
| |
| } |
| |