| package org.apache.helix.manager.zk; |
| |
| /* |
| * 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. |
| */ |
| |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.atomic.AtomicReference; |
| |
| import org.apache.helix.HelixException; |
| import org.apache.helix.HelixManager; |
| import org.apache.helix.HelixManagerFactory; |
| import org.apache.helix.InstanceType; |
| import org.apache.helix.SystemPropertyKeys; |
| import org.apache.helix.TestHelper; |
| import org.apache.helix.ZkTestHelper; |
| import org.apache.helix.zookeeper.api.client.HelixZkClient; |
| import org.apache.helix.store.zk.ZkHelixPropertyStore; |
| import org.apache.helix.tools.ClusterSetup; |
| import org.apache.helix.zookeeper.zkclient.ZkServer; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| import org.testng.Assert; |
| import org.testng.annotations.Test; |
| |
| public class TestZkReconnect { |
| private static final Logger LOG = LoggerFactory.getLogger(TestZkReconnect.class); |
| |
| @Test |
| public void testHelixManagerStateListenerCallback() throws Exception { |
| final int zkPort = TestHelper.getRandomPort(); |
| final String zkAddr = String.format("localhost:%d", zkPort); |
| final ZkServer zkServer = TestHelper.startZkServer(zkAddr); |
| |
| String className = TestHelper.getTestClassName(); |
| String methodName = TestHelper.getTestMethodName(); |
| final String clusterName = className + "_" + methodName; |
| |
| // Init onDisconnectedFlag to check if callback is triggered |
| final AtomicReference<Boolean> onDisconnectedFlag = new AtomicReference<>(false); |
| final AtomicReference<Boolean> onConnectedFlag = new AtomicReference<>(false); |
| |
| // Setup cluster |
| LOG.info("Setup clusters"); |
| ClusterSetup clusterSetup = new ClusterSetup(zkAddr); |
| clusterSetup.addCluster(clusterName, true); |
| // For fast test, set short timeout |
| System.setProperty(SystemPropertyKeys.ZK_CONNECTION_TIMEOUT, "2000"); |
| |
| // Registers and starts controller, register listener for disconnect handling |
| LOG.info("Starts controller"); |
| final ZKHelixManager controller = |
| (ZKHelixManager) HelixManagerFactory.getZKHelixManager(clusterName, null, InstanceType.CONTROLLER, zkAddr, |
| new HelixManagerStateListener() { |
| @Override |
| public void onConnected(HelixManager helixManager) throws Exception { |
| Assert.assertEquals(helixManager.getClusterName(), clusterName); |
| onConnectedFlag.getAndSet(true); |
| } |
| |
| @Override |
| public void onDisconnected(HelixManager helixManager, Throwable error) throws Exception { |
| Assert.assertEquals(helixManager.getClusterName(), clusterName); |
| onDisconnectedFlag.getAndSet(true); |
| } |
| }); |
| |
| Assert.assertEquals(controller.getMetadataStoreConnectionString(), zkAddr); |
| |
| try { |
| controller.connect(); |
| // check onConnected() is triggered |
| Assert.assertTrue(onConnectedFlag.getAndSet(false)); |
| |
| // 1. shutdown zkServer and check if handler trigger callback |
| zkServer.shutdown(); |
| // Simulate a retry in ZkClient that will not succeed |
| ZkTestHelper.injectExpire(controller._zkclient); |
| Assert.assertFalse(controller._zkclient.waitUntilConnected(5000, TimeUnit.MILLISECONDS)); |
| // While retrying, onDisconnectedFlag = false |
| Assert.assertFalse(onDisconnectedFlag.get()); |
| |
| // 2. restart zkServer and check if handler will recover connection |
| zkServer.start(); |
| Assert.assertTrue(controller._zkclient |
| .waitUntilConnected(HelixZkClient.DEFAULT_CONNECTION_TIMEOUT, TimeUnit.MILLISECONDS)); |
| Assert.assertTrue(controller.isConnected()); |
| |
| // New propertyStore should be in good state |
| ZkHelixPropertyStore propertyStore = controller.getHelixPropertyStore(); |
| propertyStore.get("/", null, 0); |
| |
| TestHelper.verify(new TestHelper.Verifier() { |
| @Override |
| public boolean verify() throws Exception { |
| return onConnectedFlag.getAndSet(false); |
| } |
| }, 1000); |
| |
| // Inject expire to test handler |
| // onDisconnectedFlag should be set within onDisconnected handler |
| controller.handleSessionEstablishmentError(new Exception("For testing")); |
| TestHelper.verify(new TestHelper.Verifier() { |
| @Override |
| public boolean verify() throws Exception { |
| return onDisconnectedFlag.get(); |
| } |
| }, 1000); |
| Assert.assertFalse(onConnectedFlag.get()); |
| Assert.assertFalse(controller.isConnected()); |
| |
| // Verify ZK is down |
| try { |
| controller.getHelixPropertyStore(); |
| } catch (HelixException e) { |
| // Expected exception |
| System.out.println(e.getMessage()); |
| } |
| } finally { |
| controller.disconnect(); |
| zkServer.shutdown(); |
| System.clearProperty(SystemPropertyKeys.ZK_CONNECTION_TIMEOUT); |
| } |
| } |
| } |