001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.master.balancer;
019
020import static org.apache.hadoop.hbase.master.balancer.CandidateGeneratorTestUtil.runBalancerToExhaustion;
021
022import java.util.ArrayList;
023import java.util.HashMap;
024import java.util.List;
025import java.util.Map;
026import java.util.Set;
027import org.apache.hadoop.conf.Configuration;
028import org.apache.hadoop.hbase.HBaseClassTestRule;
029import org.apache.hadoop.hbase.ServerName;
030import org.apache.hadoop.hbase.TableName;
031import org.apache.hadoop.hbase.client.RegionInfo;
032import org.apache.hadoop.hbase.client.RegionInfoBuilder;
033import org.apache.hadoop.hbase.master.balancer.replicas.ReplicaKeyCache;
034import org.apache.hadoop.hbase.testclassification.MasterTests;
035import org.apache.hadoop.hbase.testclassification.MediumTests;
036import org.apache.hadoop.hbase.util.Bytes;
037import org.junit.BeforeClass;
038import org.junit.ClassRule;
039import org.junit.Test;
040import org.junit.experimental.categories.Category;
041import org.slf4j.Logger;
042import org.slf4j.LoggerFactory;
043
044@Category({ MediumTests.class, MasterTests.class })
045public class TestLargeClusterBalancingConditionalReplicaDistribution {
046
047  @ClassRule
048  public static final HBaseClassTestRule CLASS_RULE =
049    HBaseClassTestRule.forClass(TestLargeClusterBalancingConditionalReplicaDistribution.class);
050
051  private static final Logger LOG =
052    LoggerFactory.getLogger(TestLargeClusterBalancingConditionalReplicaDistribution.class);
053
054  private static final int NUM_SERVERS = 1000;
055  private static final int NUM_REGIONS = 20_000;
056  private static final int NUM_REPLICAS = 3;
057  private static final int NUM_TABLES = 100;
058
059  private static final ServerName[] servers = new ServerName[NUM_SERVERS];
060  private static final Map<ServerName, List<RegionInfo>> serverToRegions = new HashMap<>();
061
062  @BeforeClass
063  public static void setup() {
064    // Initialize servers
065    for (int i = 0; i < NUM_SERVERS; i++) {
066      servers[i] = ServerName.valueOf("server" + i, i, System.currentTimeMillis());
067      serverToRegions.put(servers[i], new ArrayList<>());
068    }
069
070    // Create primary regions and their replicas
071    List<RegionInfo> allRegions = new ArrayList<>();
072    for (int i = 0; i < NUM_REGIONS; i++) {
073      TableName tableName = getTableName(i);
074      // Define startKey and endKey for the region
075      byte[] startKey = Bytes.toBytes(i);
076      byte[] endKey = Bytes.toBytes(i + 1);
077
078      // Create 3 replicas for each primary region
079      for (int replicaId = 0; replicaId < NUM_REPLICAS; replicaId++) {
080        RegionInfo regionInfo = RegionInfoBuilder.newBuilder(tableName).setStartKey(startKey)
081          .setEndKey(endKey).setReplicaId(replicaId).build();
082        allRegions.add(regionInfo);
083      }
084    }
085
086    // Assign all regions to one server
087    for (RegionInfo regionInfo : allRegions) {
088      serverToRegions.get(servers[0]).add(regionInfo);
089    }
090  }
091
092  private static TableName getTableName(int i) {
093    return TableName.valueOf("userTable" + i % NUM_TABLES);
094  }
095
096  @Test
097  public void testReplicaDistribution() {
098    Configuration conf = new Configuration();
099    DistributeReplicasTestConditional.enableConditionalReplicaDistributionForTest(conf);
100    conf.setBoolean(ReplicaKeyCache.CACHE_REPLICA_KEYS_KEY, true);
101    conf.setInt(ReplicaKeyCache.REPLICA_KEY_CACHE_SIZE_KEY, Integer.MAX_VALUE);
102    conf.setLong("hbase.master.balancer.stochastic.maxRunningTime", 30_000);
103
104    // turn off replica cost functions
105    conf.setLong("hbase.master.balancer.stochastic.regionReplicaRackCostKey", 0);
106    conf.setLong("hbase.master.balancer.stochastic.regionReplicaHostCostKey", 0);
107
108    runBalancerToExhaustion(conf, serverToRegions,
109      Set.of(CandidateGeneratorTestUtil::areAllReplicasDistributed), 10.0f);
110    LOG.info("Region replicas are appropriately distributed across RegionServers.");
111  }
112}