/**
    * 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.
   */
  package org.apache.hadoop.hbase.master.balancer;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.apache.hadoop.hbase.testclassification.MediumTests;
  import org.junit.After;
  import org.junit.Before;
  import org.junit.Test;
  import org.junit.experimental.categories.Category;
  
  @Category({MediumTests.class})
  public class TestStochasticLoadBalancer2 extends BalancerTestBase {
    private static final Log LOG = LogFactory.getLog(TestStochasticLoadBalancer2.class);
  
    @Before
    public void before() {
      conf.setFloat("hbase.master.balancer.stochastic.maxMovePercent", 1.0f);
      conf.setLong(StochasticLoadBalancer.MAX_STEPS_KEY, 2000000L);
      conf.setFloat("hbase.master.balancer.stochastic.localityCost", 0);
      conf.setLong("hbase.master.balancer.stochastic.maxRunningTime", 90 * 1000); // 90 sec
      conf.setFloat("hbase.master.balancer.stochastic.minCostNeedBalance", 0.05f);
      loadBalancer.setConf(conf);
    }
  
    @After
    public void after() {
      // reset config to make sure balancer run
      loadBalancer.setConf(conf);
    }
  
    @Test (timeout = 800000)
    public void testRegionReplicasOnMidCluster() {
      int numNodes = 200;
      int numRegions = 40 * 200;
      int replication = 3; // 3 replicas per region
      int numRegionsPerServer = 30; //all regions are mostly balanced
      int numTables = 10;
      testWithCluster(numNodes, numRegions, numRegionsPerServer, replication, numTables, true, true);
    }
  
    @Test (timeout = 800000)
    public void testRegionReplicasOnLargeCluster() {
      int numNodes = 1000;
      int numRegions = 20 * numNodes; // 20 * replication regions per RS
      int numRegionsPerServer = 19; // all servers except one
      int numTables = 100;
      int replication = 3;
      testWithCluster(numNodes, numRegions, numRegionsPerServer, replication, numTables, true, true);
    }
  
    @Test (timeout = 800000)
    public void testRegionReplicasOnMidClusterHighReplication() {
      conf.setLong(StochasticLoadBalancer.MAX_STEPS_KEY, 4000000L);
      conf.setLong("hbase.master.balancer.stochastic.maxRunningTime", 120 * 1000); // 120 sec
      loadBalancer.setConf(conf);
      int numNodes = 80;
      int numRegions = 6 * numNodes;
      int replication = 80; // 80 replicas per region, one for each server
      int numRegionsPerServer = 5;
      int numTables = 10;
      testWithCluster(numNodes, numRegions, numRegionsPerServer, replication, numTables, false, true);
    }
  
    @Test (timeout = 800000)
    public void testRegionReplicationOnMidClusterReplicationGreaterThanNumNodes() {
      conf.setLong("hbase.master.balancer.stochastic.maxRunningTime", 120 * 1000); // 120 sec
      loadBalancer.setConf(conf);
      int numNodes = 40;
      int numRegions = 6 * 50;
      int replication = 50; // 50 replicas per region, more than numNodes
      int numRegionsPerServer = 6;
      int numTables = 10;
      testWithCluster(numNodes, numRegions, numRegionsPerServer, replication, numTables, true, false);
    }
  }