hbase-server/src/test/java/org/apache/hadoop/hbase/master/balancer/TestStochasticLoadBalancerRegionReplicaWithRacks.java

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 * Licensed to the Apache Software Foundation (ASF) under one
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 * 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
 *
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package org.apache.hadoop.hbase.master.balancer;

import java.util.List;
import java.util.Map;
import org.apache.hadoop.hbase.HBaseClassTestRule;
import org.apache.hadoop.hbase.ServerName;
import org.apache.hadoop.hbase.client.RegionInfo;
import org.apache.hadoop.hbase.master.RackManager;
import org.apache.hadoop.hbase.testclassification.LargeTests;
import org.apache.hadoop.hbase.testclassification.MasterTests;
import org.junit.ClassRule;
import org.junit.Test;
import org.junit.experimental.categories.Category;

@Category({ MasterTests.class, LargeTests.class })
public class TestStochasticLoadBalancerRegionReplicaWithRacks extends StochasticBalancerTestBase {

  @ClassRule
  public static final HBaseClassTestRule CLASS_RULE =
      HBaseClassTestRule.forClass(TestStochasticLoadBalancerRegionReplicaWithRacks.class);

  private static class ForTestRackManager extends RackManager {
    int numRacks;

    public ForTestRackManager(int numRacks) {
      this.numRacks = numRacks;
    }

    @Override
    public String getRack(ServerName server) {
      return "rack_" + (server.hashCode() % numRacks);
    }
  }

  @Test
  public void testRegionReplicationOnMidClusterWithRacks() {
    conf.setLong(StochasticLoadBalancer.MAX_STEPS_KEY, 10000000L);
    conf.setFloat("hbase.master.balancer.stochastic.maxMovePercent", 1.0f);
    conf.setLong("hbase.master.balancer.stochastic.maxRunningTime", 120 * 1000); // 120 sec
    loadBalancer.setConf(conf);
    int numNodes = 30;
    int numRegions = numNodes * 30;
    int replication = 3; // 3 replicas per region
    int numRegionsPerServer = 28;
    int numTables = 10;
    int numRacks = 4; // all replicas should be on a different rack
    Map<ServerName, List<RegionInfo>> serverMap =
        createServerMap(numNodes, numRegions, numRegionsPerServer, replication, numTables);
    RackManager rm = new ForTestRackManager(numRacks);

    testWithCluster(serverMap, rm, false, true);
  }
}