| /** |
| * 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.hcatalog.hbase.snapshot.lock; |
| |
| import org.apache.zookeeper.ZooKeeper; |
| import org.apache.zookeeper.test.ClientBase; |
| |
| import java.util.concurrent.CountDownLatch; |
| import java.util.concurrent.TimeUnit; |
| |
| import org.junit.After; |
| import org.junit.Assert; |
| import org.junit.Test; |
| |
| /** |
| * test for writelock |
| * This class is taken from the zookeeper 3.4.0 as-is to test the zookeeper lock |
| * Recipe with a change in the package name. |
| */ |
| public class WriteLockTest extends ClientBase { |
| protected int sessionTimeout = 10 * 1000; |
| protected String dir = "/" + getClass().getName(); |
| protected WriteLock[] nodes; |
| protected CountDownLatch latch = new CountDownLatch(1); |
| private boolean restartServer = true; |
| private boolean workAroundClosingLastZNodeFails = true; |
| private boolean killLeader = true; |
| |
| @Test |
| public void testRun() throws Exception { |
| runTest(3); |
| } |
| |
| class LockCallback implements LockListener { |
| public void lockAcquired() { |
| latch.countDown(); |
| } |
| |
| public void lockReleased() { |
| |
| } |
| |
| } |
| protected void runTest(int count) throws Exception { |
| nodes = new WriteLock[count]; |
| for (int i = 0; i < count; i++) { |
| ZooKeeper keeper = createClient(); |
| WriteLock leader = new WriteLock(keeper, dir, null); |
| leader.setLockListener(new LockCallback()); |
| nodes[i] = leader; |
| |
| leader.lock(); |
| } |
| |
| // lets wait for any previous leaders to die and one of our new |
| // nodes to become the new leader |
| latch.await(30, TimeUnit.SECONDS); |
| |
| WriteLock first = nodes[0]; |
| dumpNodes(count); |
| |
| // lets assert that the first election is the leader |
| Assert.assertTrue("The first znode should be the leader " + first.getId(), first.isOwner()); |
| |
| for (int i = 1; i < count; i++) { |
| WriteLock node = nodes[i]; |
| Assert.assertFalse("Node should not be the leader " + node.getId(), node.isOwner()); |
| } |
| |
| if (count > 1) { |
| if (killLeader) { |
| System.out.println("Now killing the leader"); |
| // now lets kill the leader |
| latch = new CountDownLatch(1); |
| first.unlock(); |
| latch.await(30, TimeUnit.SECONDS); |
| //Thread.sleep(10000); |
| WriteLock second = nodes[1]; |
| dumpNodes(count); |
| // lets assert that the first election is the leader |
| Assert.assertTrue("The second znode should be the leader " + second.getId(), second.isOwner()); |
| |
| for (int i = 2; i < count; i++) { |
| WriteLock node = nodes[i]; |
| Assert.assertFalse("Node should not be the leader " + node.getId(), node.isOwner()); |
| } |
| } |
| |
| |
| if (restartServer) { |
| // now lets stop the server |
| System.out.println("Now stopping the server"); |
| stopServer(); |
| Thread.sleep(10000); |
| |
| // TODO lets assert that we are no longer the leader |
| dumpNodes(count); |
| |
| System.out.println("Starting the server"); |
| startServer(); |
| Thread.sleep(10000); |
| |
| for (int i = 0; i < count - 1; i++) { |
| System.out.println("Calling acquire for node: " + i); |
| nodes[i].lock(); |
| } |
| dumpNodes(count); |
| System.out.println("Now closing down..."); |
| } |
| } |
| } |
| |
| protected void dumpNodes(int count) { |
| for (int i = 0; i < count; i++) { |
| WriteLock node = nodes[i]; |
| System.out.println("node: " + i + " id: " + |
| node.getId() + " is leader: " + node.isOwner()); |
| } |
| } |
| |
| @After |
| public void tearDown() throws Exception { |
| if (nodes != null) { |
| for (int i = 0; i < nodes.length; i++) { |
| WriteLock node = nodes[i]; |
| if (node != null) { |
| System.out.println("Closing node: " + i); |
| node.close(); |
| if (workAroundClosingLastZNodeFails && i == nodes.length - 1) { |
| System.out.println("Not closing zookeeper: " + i + " due to bug!"); |
| } else { |
| System.out.println("Closing zookeeper: " + i); |
| node.getZookeeper().close(); |
| System.out.println("Closed zookeeper: " + i); |
| } |
| } |
| } |
| } |
| System.out.println("Now lets stop the server"); |
| super.tearDown(); |
| |
| } |
| } |