package org.apache.helix.integration.manager;
/*
* 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.Date;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import org.apache.helix.HelixManager;
import org.apache.helix.InstanceType;
import org.apache.helix.NotificationContext;
import org.apache.helix.PropertyKey;
import org.apache.helix.PropertyPathConfig;
import org.apache.helix.PropertyType;
import org.apache.helix.TestHelper;
import org.apache.helix.ZNRecord;
import org.apache.helix.ZkTestHelper;
import org.apache.helix.api.id.PartitionId;
import org.apache.helix.api.id.StateModelDefId;
import org.apache.helix.manager.zk.MockParticipant;
import org.apache.helix.manager.zk.MockController;
import org.apache.helix.manager.zk.ZKHelixDataAccessor;
import org.apache.helix.manager.zk.ZKHelixManager;
import org.apache.helix.manager.zk.ZNRecordSerializer;
import org.apache.helix.mock.participant.MockMSModelFactory;
import org.apache.helix.mock.participant.MockTransition;
import org.apache.helix.model.Message;
import org.apache.helix.testutil.ZkTestBase;
import org.apache.helix.tools.ClusterStateVerifier;
import org.apache.helix.tools.ClusterStateVerifier.BestPossAndExtViewZkVerifier;
import org.apache.log4j.Logger;
import org.testng.Assert;
import org.testng.annotations.Test;
public class TestParticipantManager extends ZkTestBase {
private static Logger LOG = Logger.getLogger(TestParticipantManager.class);
@Test
public void simpleIntegrationTest() throws Exception {
// Logger.getRootLogger().setLevel(Level.INFO);
String className = TestHelper.getTestClassName();
String methodName = TestHelper.getTestMethodName();
String clusterName = className + "_" + methodName;
int n = 1;
System.out.println("START " + clusterName + " at " + new Date(System.currentTimeMillis()));
TestHelper.setupCluster(clusterName, _zkaddr, 12918, // participant port
"localhost", // participant name prefix
"TestDB", // resource name prefix
1, // resources
4, // partitions per resource
n, // number of nodes
1, // replicas
"MasterSlave", true); // do rebalance
HelixManager participant =
new ZKHelixManager(clusterName, "localhost_12918", InstanceType.PARTICIPANT, _zkaddr);
participant.getStateMachineEngine().registerStateModelFactory(StateModelDefId.MasterSlave,
new MockMSModelFactory());
participant.connect();
HelixManager controller =
new ZKHelixManager(clusterName, "controller_0", InstanceType.CONTROLLER, _zkaddr);
controller.connect();
boolean result =
ClusterStateVerifier.verifyByZkCallback(new BestPossAndExtViewZkVerifier(_zkaddr,
clusterName));
Assert.assertTrue(result);
// cleanup
controller.disconnect();
participant.disconnect();
// verify all live-instances and leader nodes are gone
ZKHelixDataAccessor accessor =
new ZKHelixDataAccessor(clusterName, _baseAccessor);
PropertyKey.Builder keyBuilder = accessor.keyBuilder();
Assert.assertNull(accessor.getProperty(keyBuilder.liveInstance("localhost_12918")));
Assert.assertNull(accessor.getProperty(keyBuilder.controllerLeader()));
System.out.println("END " + clusterName + " at " + new Date(System.currentTimeMillis()));
}
@Test
public void simpleSessionExpiryTest() throws Exception {
// Logger.getRootLogger().setLevel(Level.WARN);
String className = TestHelper.getTestClassName();
String methodName = TestHelper.getTestMethodName();
final String clusterName = className + "_" + methodName;
int n = 1;
System.out.println("START " + clusterName + " at " + new Date(System.currentTimeMillis()));
MockParticipant[] participants = new MockParticipant[n];
TestHelper.setupCluster(clusterName, _zkaddr, 12918, // participant port
"localhost", // participant name prefix
"TestDB", // resource name prefix
1, // resources
1, // partitions per resource
n, // number of nodes
1, // replicas
"MasterSlave", true); // do rebalance
// start controller
MockController controller =
new MockController(_zkaddr, clusterName, "controller_0");
controller.syncStart();
// start participants
for (int i = 0; i < n; i++) {
String instanceName = "localhost_" + (12918 + i);
participants[i] = new MockParticipant(_zkaddr, clusterName, instanceName);
participants[i].syncStart();
}
boolean result =
ClusterStateVerifier.verifyByZkCallback(new BestPossAndExtViewZkVerifier(_zkaddr,
clusterName));
Assert.assertTrue(result);
String oldSessionId = participants[0].getSessionId();
// expire zk-connection on localhost_12918
ZkTestHelper.expireSession(participants[0].getZkClient());
// wait until session expiry callback happens
TimeUnit.MILLISECONDS.sleep(100);
result =
ClusterStateVerifier.verifyByZkCallback(new BestPossAndExtViewZkVerifier(_zkaddr,
clusterName));
Assert.assertTrue(result);
String newSessionId = participants[0].getSessionId();
Assert.assertNotSame(newSessionId, oldSessionId);
// cleanup
controller.syncStop();
for (int i = 0; i < n; i++) {
participants[i].syncStop();
}
System.out.println("END " + clusterName + " at " + new Date(System.currentTimeMillis()));
}
class SessionExpiryTransition extends MockTransition {
private final AtomicBoolean _done = new AtomicBoolean();
private final CountDownLatch _startCountdown;
private final CountDownLatch _endCountdown;
public SessionExpiryTransition(CountDownLatch startCountdown, CountDownLatch endCountdown) {
_startCountdown = startCountdown;
_endCountdown = endCountdown;
}
@Override
public void doTransition(Message message, NotificationContext context)
throws InterruptedException {
String instance = message.getTgtName();
PartitionId partition = message.getPartitionId();
if (instance.equals("localhost_12918") && partition.equals("TestDB0_0")
&& _done.getAndSet(true) == false) {
_startCountdown.countDown();
// this await will be interrupted since we cancel the task during handleNewSession
_endCountdown.await();
}
}
}
@Test
public void testSessionExpiryInTransition() throws Exception {
String className = TestHelper.getTestClassName();
String methodName = TestHelper.getTestMethodName();
final String clusterName = className + "_" + methodName;
int n = 1;
CountDownLatch startCountdown = new CountDownLatch(1);
CountDownLatch endCountdown = new CountDownLatch(1);
System.out.println("START " + clusterName + " at " + new Date(System.currentTimeMillis()));
MockParticipant[] participants = new MockParticipant[n];
TestHelper.setupCluster(clusterName, _zkaddr, 12918, // participant port
"localhost", // participant name prefix
"TestDB", // resource name prefix
1, // resources
1, // partitions per resource
n, // number of nodes
1, // replicas
"MasterSlave", true); // do rebalance
// start controller
MockController controller =
new MockController(_zkaddr, clusterName, "controller_0");
controller.syncStart();
// start participants
for (int i = 0; i < n; i++) {
String instanceName = "localhost_" + (12918 + i);
participants[i] = new MockParticipant(_zkaddr, clusterName, instanceName);
participants[i].setTransition(new SessionExpiryTransition(startCountdown, endCountdown));
participants[i].syncStart();
}
// wait transition happens to trigger session expiry
startCountdown.await();
String oldSessionId = participants[0].getSessionId();
System.out.println("oldSessionId: " + oldSessionId);
ZkTestHelper.expireSession(participants[0].getZkClient());
boolean result =
ClusterStateVerifier.verifyByZkCallback(new BestPossAndExtViewZkVerifier(_zkaddr,
clusterName));
Assert.assertTrue(result);
String newSessionId = participants[0].getSessionId();
Assert.assertNotSame(newSessionId, oldSessionId);
// assert interrupt exception error in old session
String errPath =
PropertyPathConfig.getPath(PropertyType.ERRORS, clusterName, "localhost_12918",
oldSessionId, "TestDB0", "TestDB0_0");
ZNRecord error = _zkclient.readData(errPath);
Assert
.assertNotNull(
error,
"InterruptedException should happen in old session since task is being cancelled during handleNewSession");
String errString = new String(new ZNRecordSerializer().serialize(error));
Assert.assertTrue(errString.indexOf("InterruptedException") != -1);
// cleanup
controller.syncStop();
for (int i = 0; i < n; i++) {
participants[i].syncStop();
}
System.out.println("END " + clusterName + " at " + new Date(System.currentTimeMillis()));
}
}