/**
* 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.MasterAddressTracker;
import org.apache.hadoop.hbase.ServerName;
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;
ServerName sn = new ServerName(host, port, System.currentTimeMillis());
LOG.info("Creating master node");
ZKUtil.createEphemeralNodeAndWatch(zk, zk.masterAddressZNode, sn.getVersionedBytes());
// 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());
ServerName pulledAddress = addressManager.getMasterAddress();
assertTrue(pulledAddress.equals(sn));
}
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();
}
}
}