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

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 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
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package org.apache.hadoop.hbase.master.balancer;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;
import org.apache.hadoop.hbase.HBaseClassTestRule;
import org.apache.hadoop.hbase.ServerName;
import org.apache.hadoop.hbase.client.RegionInfo;
import org.apache.hadoop.hbase.testclassification.MasterTests;
import org.apache.hadoop.hbase.testclassification.MediumTests;
import org.junit.ClassRule;
import org.junit.Test;
import org.junit.experimental.categories.Category;

@Category({ MasterTests.class, MediumTests.class })
public class TestStochasticLoadBalancerRegionReplicaSameHosts extends StochasticBalancerTestBase {

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

  @Test
  public void testRegionReplicationOnMidClusterSameHosts() {
    conf.setLong(StochasticLoadBalancer.MAX_STEPS_KEY, 2000000L);
    conf.setLong("hbase.master.balancer.stochastic.maxRunningTime", 90 * 1000); // 90 sec
    conf.setFloat("hbase.master.balancer.stochastic.maxMovePercent", 1.0f);
    loadBalancer.setConf(conf);
    int numHosts = 30;
    int numRegions = 30 * 30;
    int replication = 3; // 3 replicas per region
    int numRegionsPerServer = 5;
    int numTables = 10;
    Map<ServerName, List<RegionInfo>> serverMap =
        createServerMap(numHosts, numRegions, numRegionsPerServer, replication, numTables);
    int numNodesPerHost = 4;

    // create a new map with 4 RS per host.
    Map<ServerName, List<RegionInfo>> newServerMap = new TreeMap<>(serverMap);
    for (Map.Entry<ServerName, List<RegionInfo>> entry : serverMap.entrySet()) {
      for (int i = 1; i < numNodesPerHost; i++) {
        ServerName s1 = entry.getKey();
        // create an RS for the same host
        ServerName s2 = ServerName.valueOf(s1.getHostname(), s1.getPort() + i, 1);
        newServerMap.put(s2, new ArrayList<>());
      }
    }

    testWithCluster(newServerMap, null, true, true);
  }
}