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;
019
020import static org.junit.jupiter.api.Assertions.assertEquals;
021import static org.junit.jupiter.api.Assertions.assertNotNull;
022import static org.junit.jupiter.api.Assertions.assertTrue;
023
024import java.util.List;
025import org.apache.hadoop.hbase.HConstants;
026import org.apache.hadoop.hbase.ServerName;
027import org.apache.hadoop.hbase.SingleProcessHBaseCluster;
028import org.apache.hadoop.hbase.TableName;
029import org.apache.hadoop.hbase.client.RegionInfo;
030import org.apache.hadoop.hbase.testclassification.MasterTests;
031import org.apache.hadoop.hbase.testclassification.MediumTests;
032import org.apache.hadoop.hbase.util.JVMClusterUtil;
033import org.junit.jupiter.api.Tag;
034import org.junit.jupiter.api.Test;
035import org.slf4j.Logger;
036import org.slf4j.LoggerFactory;
037
038@Tag(MasterTests.TAG)
039@Tag(MediumTests.TAG)
040public class TestRoundRobinAssignmentOnRestart extends AbstractTestRestartCluster {
041
042  private static final Logger LOG =
043    LoggerFactory.getLogger(TestRoundRobinAssignmentOnRestart.class);
044
045  @Override
046  protected boolean splitWALCoordinatedByZk() {
047    return true;
048  }
049
050  private final int regionNum = 10;
051  private final int rsNum = 2;
052
053  /**
054   * This tests retaining assignments on a cluster restart
055   */
056  @Test
057  public void test() throws Exception {
058    UTIL.startMiniCluster(rsNum);
059    // Turn off balancer
060    UTIL.getMiniHBaseCluster().getMaster().getMasterRpcServices().synchronousBalanceSwitch(false);
061    LOG.info("\n\nCreating tables");
062    for (TableName TABLE : TABLES) {
063      UTIL.createMultiRegionTable(TABLE, FAMILY, regionNum);
064    }
065    // Wait until all regions are assigned
066    for (TableName TABLE : TABLES) {
067      UTIL.waitTableEnabled(TABLE);
068    }
069    UTIL.waitUntilNoRegionsInTransition(60000);
070
071    SingleProcessHBaseCluster cluster = UTIL.getHBaseCluster();
072    List<JVMClusterUtil.RegionServerThread> threads = cluster.getLiveRegionServerThreads();
073    assertEquals(2, threads.size());
074
075    ServerName testServer = threads.get(0).getRegionServer().getServerName();
076    int port = testServer.getPort();
077    List<RegionInfo> regionInfos =
078      cluster.getMaster().getAssignmentManager().getRegionsOnServer(testServer);
079    LOG.debug("RegionServer {} has {} regions", testServer, regionInfos.size());
080    assertTrue(regionInfos.size() >= (TABLES.length * regionNum / rsNum));
081
082    // Restart 1 regionserver
083    cluster.stopRegionServer(testServer);
084    cluster.waitForRegionServerToStop(testServer, 60000);
085    cluster.getConf().setInt(HConstants.REGIONSERVER_PORT, port);
086    cluster.startRegionServer();
087
088    HMaster master = UTIL.getMiniHBaseCluster().getMaster();
089    List<ServerName> localServers = master.getServerManager().getOnlineServersList();
090    ServerName newTestServer = null;
091    for (ServerName serverName : localServers) {
092      if (serverName.getAddress().equals(testServer.getAddress())) {
093        newTestServer = serverName;
094        break;
095      }
096    }
097    assertNotNull(newTestServer);
098
099    // Wait until all regions are assigned
100    for (TableName TABLE : TABLES) {
101      UTIL.waitTableAvailable(TABLE);
102    }
103    UTIL.waitUntilNoRegionsInTransition(60000);
104
105    List<RegionInfo> newRegionInfos =
106      cluster.getMaster().getAssignmentManager().getRegionsOnServer(newTestServer);
107    LOG.debug("RegionServer {} has {} regions", newTestServer, newRegionInfos.size());
108    assertTrue(newRegionInfos.size() < regionInfos.size(),
109      "Should not retain all regions when restart");
110  }
111}