package org.apache.helix.integration;
/*
* 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 org.apache.helix.HelixDataAccessor;
import org.apache.helix.HelixManager;
import org.apache.helix.PropertyKey.Builder;
import org.apache.helix.api.id.PartitionId;
import org.apache.helix.controller.rebalancer.Rebalancer;
import org.apache.helix.controller.stages.ClusterDataCache;
import org.apache.helix.controller.stages.CurrentStateOutput;
import org.apache.helix.manager.zk.ZKHelixDataAccessor;
import org.apache.helix.model.ExternalView;
import org.apache.helix.model.IdealState;
import org.apache.helix.model.IdealState.IdealStateProperty;
import org.apache.helix.tools.ClusterStateVerifier;
import org.testng.Assert;
import org.testng.annotations.Test;
@SuppressWarnings("deprecation")
public class TestUserDefRebalancerCompatibility extends ZkStandAloneCMTestBase {
String db2 = TEST_DB + "2";
static boolean testRebalancerCreated = false;
static boolean testRebalancerInvoked = false;
public static class TestRebalancer implements Rebalancer {
@Override
public void init(HelixManager helixManager) {
testRebalancerCreated = true;
}
/**
* Very basic mapping that evenly assigns one replica of each partition to live nodes, each of
* which is in the highest-priority state.
*/
@Override
public IdealState computeResourceMapping(String resourceName, IdealState currentIdealState,
CurrentStateOutput currentStateOutput, ClusterDataCache clusterData) {
testRebalancerInvoked = true;
for (String partition : currentIdealState.getPartitionSet()) {
String instance = currentIdealState.getPreferenceList(partition).get(0);
currentIdealState.getPreferenceList(partition).clear();
currentIdealState.getPreferenceList(partition).add(instance);
currentIdealState.getInstanceStateMap(partition).clear();
currentIdealState.getInstanceStateMap(partition).put(instance, "MASTER");
}
currentIdealState.setReplicas("1");
return currentIdealState;
}
}
@Test
public void testCustomizedIdealStateRebalancer() throws InterruptedException {
_setupTool.addResourceToCluster(CLUSTER_NAME, db2, 60, "MasterSlave");
_setupTool.addResourceProperty(CLUSTER_NAME, db2,
IdealStateProperty.REBALANCER_CLASS_NAME.toString(),
TestUserDefRebalancerCompatibility.TestRebalancer.class.getName());
_setupTool.rebalanceStorageCluster(CLUSTER_NAME, db2, 3);
try {
boolean result =
ClusterStateVerifier
.verifyByZkCallback(new TestCustomizedIdealStateRebalancer.ExternalViewBalancedVerifier(
_zkclient, CLUSTER_NAME, db2));
Assert.assertTrue(result);
Thread.sleep(1000);
HelixDataAccessor accessor = new ZKHelixDataAccessor(CLUSTER_NAME, _baseAccessor);
Builder keyBuilder = accessor.keyBuilder();
ExternalView ev = accessor.getProperty(keyBuilder.externalView(db2));
Assert.assertEquals(ev.getPartitionSet().size(), 60);
for (String partition : ev.getPartitionSet()) {
Assert.assertEquals(ev.getStateMap(partition).size(), 1);
}
IdealState is = accessor.getProperty(keyBuilder.idealStates(db2));
for (PartitionId partition : is.getPartitionIdSet()) {
Assert.assertEquals(is.getPreferenceList(partition).size(), 3);
Assert.assertEquals(is.getParticipantStateMap(partition).size(), 3);
}
Assert.assertTrue(testRebalancerCreated);
Assert.assertTrue(testRebalancerInvoked);
} finally {
_setupTool.dropResourceFromCluster(CLUSTER_NAME, db2);
}
}
}