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.util;
019
020import static org.junit.jupiter.api.Assertions.assertEquals;
021import static org.junit.jupiter.api.Assertions.assertTrue;
022
023import java.util.ArrayList;
024import java.util.List;
025import java.util.stream.Collectors;
026import java.util.stream.IntStream;
027import org.apache.hadoop.hbase.HBaseTestingUtil;
028import org.apache.hadoop.hbase.ServerName;
029import org.apache.hadoop.hbase.SingleProcessHBaseCluster;
030import org.apache.hadoop.hbase.TableName;
031import org.apache.hadoop.hbase.client.Admin;
032import org.apache.hadoop.hbase.client.ColumnFamilyDescriptorBuilder;
033import org.apache.hadoop.hbase.client.Put;
034import org.apache.hadoop.hbase.client.Table;
035import org.apache.hadoop.hbase.client.TableDescriptor;
036import org.apache.hadoop.hbase.client.TableDescriptorBuilder;
037import org.apache.hadoop.hbase.master.RackManager;
038import org.apache.hadoop.hbase.regionserver.HRegion;
039import org.apache.hadoop.hbase.regionserver.HRegionServer;
040import org.apache.hadoop.hbase.testclassification.LargeTests;
041import org.apache.hadoop.hbase.testclassification.MiscTests;
042import org.junit.jupiter.api.AfterAll;
043import org.junit.jupiter.api.BeforeAll;
044import org.junit.jupiter.api.BeforeEach;
045import org.junit.jupiter.api.Tag;
046import org.junit.jupiter.api.Test;
047import org.junit.jupiter.api.TestInfo;
048
049@Tag(MiscTests.TAG)
050@Tag(LargeTests.TAG)
051public class TestRegionMover3 {
052
053  private static final HBaseTestingUtil TEST_UTIL = new HBaseTestingUtil();
054  private static ServerName rs0;
055  private static ServerName rs1;
056  private static ServerName rs2;
057
058  @BeforeAll
059  public static void setUpBeforeClass() throws Exception {
060    TEST_UTIL.startMiniCluster(3);
061    SingleProcessHBaseCluster cluster = TEST_UTIL.getHBaseCluster();
062    rs0 = cluster.getRegionServer(0).getServerName();
063    rs1 = cluster.getRegionServer(1).getServerName();
064    rs2 = cluster.getRegionServer(2).getServerName();
065    TEST_UTIL.getAdmin().balancerSwitch(false, true);
066  }
067
068  @AfterAll
069  public static void tearDownAfterClass() throws Exception {
070    TEST_UTIL.shutdownMiniCluster();
071  }
072
073  @BeforeEach
074  public void setUp(TestInfo testInfo) throws Exception {
075    final TableName tableName = TableName.valueOf(testInfo.getTestMethod().get().getName());
076    TableDescriptor tableDesc = TableDescriptorBuilder.newBuilder(tableName)
077      .setColumnFamily(ColumnFamilyDescriptorBuilder.of("fam1")).build();
078    int startKey = 0;
079    int endKey = 80000;
080    TEST_UTIL.getAdmin().createTable(tableDesc, Bytes.toBytes(startKey), Bytes.toBytes(endKey), 9);
081  }
082
083  @Test
084  public void testRegionUnloadWithRack(TestInfo testInfo) throws Exception {
085    final TableName tableName = TableName.valueOf(testInfo.getTestMethod().get().getName());
086    SingleProcessHBaseCluster cluster = TEST_UTIL.getHBaseCluster();
087    Admin admin = TEST_UTIL.getAdmin();
088    Table table = TEST_UTIL.getConnection().getTable(tableName);
089    List<Put> puts = IntStream.range(10, 50000).mapToObj(i -> new Put(Bytes.toBytes(i))
090      .addColumn(Bytes.toBytes("fam1"), Bytes.toBytes("q1"), Bytes.toBytes("val_" + i)))
091      .collect(Collectors.toList());
092    table.put(puts);
093    admin.flush(tableName);
094    admin.compact(tableName);
095    Thread.sleep(3000);
096    HRegionServer hRegionServer0 = cluster.getRegionServer(0);
097    HRegionServer hRegionServer1 = cluster.getRegionServer(1);
098    HRegionServer hRegionServer2 = cluster.getRegionServer(2);
099    int numRegions0 = hRegionServer0.getNumberOfOnlineRegions();
100    int numRegions1 = hRegionServer1.getNumberOfOnlineRegions();
101    int numRegions2 = hRegionServer2.getNumberOfOnlineRegions();
102
103    assertTrue(numRegions0 >= 3);
104    assertTrue(numRegions1 >= 3);
105    assertTrue(numRegions2 >= 3);
106    int totalRegions = numRegions0 + numRegions1 + numRegions2;
107
108    // source RS: rs0
109    String sourceRSName = rs0.getAddress().toString();
110
111    // move all regions from rs1 to rs0
112    for (HRegion region : hRegionServer1.getRegions()) {
113      TEST_UTIL.getAdmin().move(region.getRegionInfo().getEncodedNameAsBytes(), rs0);
114    }
115    TEST_UTIL.waitFor(5000, () -> {
116      int newNumRegions0 = hRegionServer0.getNumberOfOnlineRegions();
117      int newNumRegions1 = hRegionServer1.getNumberOfOnlineRegions();
118      return newNumRegions1 == 0 && newNumRegions0 == (numRegions0 + numRegions1);
119    });
120
121    // regionMover obj on rs0. While unloading regions from rs0
122    // with default rackManager, which resolves "/default-rack" for each server, no region
123    // is moved while using unloadFromRack() as all rs belong to same rack.
124    RegionMover.RegionMoverBuilder rmBuilder =
125      new RegionMover.RegionMoverBuilder(sourceRSName, TEST_UTIL.getConfiguration()).ack(true)
126        .maxthreads(8);
127    try (RegionMover regionMover = rmBuilder.build()) {
128      regionMover.unloadFromRack();
129      int newNumRegions0 = hRegionServer0.getNumberOfOnlineRegions();
130      int newNumRegions1 = hRegionServer1.getNumberOfOnlineRegions();
131      int newNumRegions2 = hRegionServer2.getNumberOfOnlineRegions();
132      assertEquals(0, newNumRegions1);
133      assertEquals(totalRegions, newNumRegions0 + newNumRegions2);
134    }
135
136    // use custom rackManager, which resolves "rack-1" for rs0 and rs1,
137    // while "rack-2" for rs2. Hence, unloadFromRack() from rs0 should move all
138    // regions that belong to rs0 to rs2 only, and nothing should be moved to rs1
139    // as rs0 and rs1 belong to same rack.
140    rmBuilder.rackManager(new MockRackManager());
141    try (RegionMover regionMover = rmBuilder.build()) {
142      regionMover.unloadFromRack();
143      int newNumRegions0 = hRegionServer0.getNumberOfOnlineRegions();
144      int newNumRegions1 = hRegionServer1.getNumberOfOnlineRegions();
145      int newNumRegions2 = hRegionServer2.getNumberOfOnlineRegions();
146      assertEquals(0, newNumRegions0);
147      assertEquals(0, newNumRegions1);
148      assertEquals(totalRegions, newNumRegions2);
149    }
150
151  }
152
153  private static class MockRackManager extends RackManager {
154
155    private static final String RACK_2 = "rack-2";
156    private static final String RACK_1 = "rack-1";
157
158    @Override
159    public String getRack(ServerName server) {
160      return rs2.equals(server) ? RACK_2 : RACK_1;
161    }
162
163    @Override
164    public List<String> getRack(List<ServerName> servers) {
165      List<String> racks = new ArrayList<>();
166      servers.forEach(serverName -> {
167        if (rs2.equals(serverName)) {
168          racks.add(RACK_2);
169        } else {
170          racks.add(RACK_1);
171        }
172      });
173      return racks;
174    }
175  }
176
177}