| /** |
| * Copyright 2010 The Apache Software Foundation |
| * |
| * 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.assertFalse; |
| import static org.junit.Assert.assertTrue; |
| |
| import java.util.concurrent.Semaphore; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.hbase.HBaseTestingUtility; |
| import org.apache.hadoop.hbase.HServerAddress; |
| import org.apache.hadoop.hbase.MasterAddressTracker; |
| import org.apache.hadoop.hbase.zookeeper.ZKUtil; |
| import org.apache.hadoop.hbase.zookeeper.ZooKeeperListener; |
| import org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher; |
| import org.junit.AfterClass; |
| import org.junit.BeforeClass; |
| import org.junit.Test; |
| |
| public class TestMasterAddressManager { |
| private static final Log LOG = LogFactory.getLog(TestMasterAddressManager.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(); |
| } |
| /** |
| * Unit tests that uses ZooKeeper but does not use the master-side methods |
| * but rather acts directly on ZK. |
| * @throws Exception |
| */ |
| @Test |
| public void testMasterAddressManagerFromZK() throws Exception { |
| |
| ZooKeeperWatcher zk = new ZooKeeperWatcher(TEST_UTIL.getConfiguration(), |
| "testMasterAddressManagerFromZK", null); |
| ZKUtil.createAndFailSilent(zk, zk.baseZNode); |
| |
| // Should not have a master yet |
| MasterAddressTracker addressManager = new MasterAddressTracker(zk, null); |
| addressManager.start(); |
| assertFalse(addressManager.hasMaster()); |
| zk.registerListener(addressManager); |
| |
| // Use a listener to capture when the node is actually created |
| NodeCreationListener listener = new NodeCreationListener(zk, zk.masterAddressZNode); |
| zk.registerListener(listener); |
| |
| // Create the master node with a dummy address |
| String host = "localhost"; |
| int port = 1234; |
| HServerAddress dummyAddress = new HServerAddress(host, port); |
| LOG.info("Creating master node"); |
| ZKUtil.setAddressAndWatch(zk, zk.masterAddressZNode, dummyAddress); |
| |
| // Wait for the node to be created |
| LOG.info("Waiting for master address manager to be notified"); |
| listener.waitForCreation(); |
| LOG.info("Master node created"); |
| assertTrue(addressManager.hasMaster()); |
| HServerAddress pulledAddress = addressManager.getMasterAddress(); |
| assertTrue(pulledAddress.equals(dummyAddress)); |
| |
| } |
| |
| public static class NodeCreationListener extends ZooKeeperListener { |
| private static final Log LOG = LogFactory.getLog(NodeCreationListener.class); |
| |
| private Semaphore lock; |
| private String node; |
| |
| public NodeCreationListener(ZooKeeperWatcher 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(); |
| } |
| } |
| } |