package org.apache.helix.manager.zk;
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* 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
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* KIND, either express or implied. See the License for the
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import java.util.Date;
import org.apache.helix.HelixMultiClusterController;
import org.apache.helix.HelixConnection;
import org.apache.helix.HelixDataAccessor;
import org.apache.helix.PropertyKey;
import org.apache.helix.TestHelper;
import org.apache.helix.api.id.ClusterId;
import org.apache.helix.api.id.ControllerId;
import org.apache.helix.model.LiveInstance;
import org.apache.helix.testutil.ZkTestBase;
import org.testng.Assert;
import org.testng.annotations.Test;
public class TestZkHelixMultiClusterController extends ZkTestBase {
@Test
public void testOnConnectedAndDisconnecting() throws Exception {
// Logger.getRootLogger().setLevel(Level.INFO);
String className = TestHelper.getTestClassName();
String methodName = TestHelper.getTestMethodName();
String clusterName = className + "_" + methodName;
int n = 2;
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
32, // partitions per resource
n, // number of nodes
2, // replicas
"MasterSlave", true); // do rebalance
// create connection
HelixConnection connection = new ZkHelixConnection(_zkaddr);
connection.connect();
// start multi-cluster-controller
ClusterId clusterId = ClusterId.from(clusterName);
final HelixMultiClusterController[] controllers = new HelixMultiClusterController[n];
for (int i = 0; i < n; i++) {
int port = 12918 + i;
ControllerId controllerId = ControllerId.from("localhost_" + port);
controllers[i] = connection.createMultiClusterController(clusterId, controllerId);
controllers[i].start();
}
// check live-instance znode for localhost_12918/12919 exists
final HelixDataAccessor accessor =
new ZKHelixDataAccessor(clusterName, _baseAccessor);
final PropertyKey.Builder keyBuilder = accessor.keyBuilder();
for (int i = 0; i < n; i++) {
String instanceName = controllers[i].getControllerId().stringify();
Assert.assertNotNull(accessor.getProperty(keyBuilder.liveInstance(instanceName)));
}
// check leader znode exists
LiveInstance leader = accessor.getProperty(keyBuilder.controllerLeader());
Assert.assertNotNull(leader);
Assert.assertEquals(leader.getInstanceName(), controllers[0].getControllerId().stringify());
// stop controller localhost_12918
controllers[0].stop();
// check live-instance znode for localhost_12918 is gone
String instanceName = controllers[0].getControllerId().stringify();
Assert.assertNull(accessor.getProperty(keyBuilder.liveInstance(instanceName)));
// check localhost_12919 becomes the new leader
boolean success = TestHelper.verify(new TestHelper.Verifier() {
@Override
public boolean verify() throws Exception {
LiveInstance leader = accessor.getProperty(keyBuilder.controllerLeader());
if (leader == null) {
return false;
}
return leader.getInstanceName().equals(controllers[1].getControllerId().stringify());
}
}, 3 * 1000);
Assert.assertTrue(success, "fail to re-elect new leader");
// clean up
connection.disconnect();
// check live-instance znode for localhost_12919 is gone
instanceName = controllers[1].getControllerId().stringify();
Assert.assertNull(accessor.getProperty(keyBuilder.liveInstance(instanceName)));
// check leader znode is gone
Assert.assertNull(accessor.getProperty(keyBuilder.controllerLeader()));
System.out.println("END " + clusterName + " at " + new Date(System.currentTimeMillis()));
}
}