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 java.util.ArrayList;
021import java.util.List;
022import java.util.stream.Collectors;
023import java.util.stream.IntStream;
024import org.apache.hadoop.hbase.HBaseClassTestRule;
025import org.apache.hadoop.hbase.HBaseTestingUtil;
026import org.apache.hadoop.hbase.ServerName;
027import org.apache.hadoop.hbase.SingleProcessHBaseCluster;
028import org.apache.hadoop.hbase.TableName;
029import org.apache.hadoop.hbase.client.Admin;
030import org.apache.hadoop.hbase.client.ColumnFamilyDescriptorBuilder;
031import org.apache.hadoop.hbase.client.Put;
032import org.apache.hadoop.hbase.client.Table;
033import org.apache.hadoop.hbase.client.TableDescriptor;
034import org.apache.hadoop.hbase.client.TableDescriptorBuilder;
035import org.apache.hadoop.hbase.master.RackManager;
036import org.apache.hadoop.hbase.regionserver.HRegion;
037import org.apache.hadoop.hbase.regionserver.HRegionServer;
038import org.apache.hadoop.hbase.testclassification.LargeTests;
039import org.apache.hadoop.hbase.testclassification.MiscTests;
040import org.junit.AfterClass;
041import org.junit.Assert;
042import org.junit.Before;
043import org.junit.BeforeClass;
044import org.junit.ClassRule;
045import org.junit.Rule;
046import org.junit.Test;
047import org.junit.experimental.categories.Category;
048import org.junit.rules.TestName;
049
050@Category({ MiscTests.class, LargeTests.class })
051public class TestRegionMover3 {
052
053  @ClassRule
054  public static final HBaseClassTestRule CLASS_RULE =
055    HBaseClassTestRule.forClass(TestRegionMover3.class);
056
057  @Rule
058  public TestName name = new TestName();
059
060  private static final HBaseTestingUtil TEST_UTIL = new HBaseTestingUtil();
061  private static ServerName rs0;
062  private static ServerName rs1;
063  private static ServerName rs2;
064
065  @BeforeClass
066  public static void setUpBeforeClass() throws Exception {
067    TEST_UTIL.startMiniCluster(3);
068    SingleProcessHBaseCluster cluster = TEST_UTIL.getHBaseCluster();
069    rs0 = cluster.getRegionServer(0).getServerName();
070    rs1 = cluster.getRegionServer(1).getServerName();
071    rs2 = cluster.getRegionServer(2).getServerName();
072    TEST_UTIL.getAdmin().balancerSwitch(false, true);
073  }
074
075  @AfterClass
076  public static void tearDownAfterClass() throws Exception {
077    TEST_UTIL.shutdownMiniCluster();
078  }
079
080  @Before
081  public void setUp() throws Exception {
082    final TableName tableName = TableName.valueOf(name.getMethodName());
083    TableDescriptor tableDesc = TableDescriptorBuilder.newBuilder(tableName)
084      .setColumnFamily(ColumnFamilyDescriptorBuilder.of("fam1")).build();
085    int startKey = 0;
086    int endKey = 80000;
087    TEST_UTIL.getAdmin().createTable(tableDesc, Bytes.toBytes(startKey), Bytes.toBytes(endKey), 9);
088  }
089
090  @Test
091  public void testRegionUnloadWithRack() throws Exception {
092    final TableName tableName = TableName.valueOf(name.getMethodName());
093    SingleProcessHBaseCluster cluster = TEST_UTIL.getHBaseCluster();
094    Admin admin = TEST_UTIL.getAdmin();
095    Table table = TEST_UTIL.getConnection().getTable(tableName);
096    List<Put> puts = IntStream.range(10, 50000).mapToObj(i -> new Put(Bytes.toBytes(i))
097      .addColumn(Bytes.toBytes("fam1"), Bytes.toBytes("q1"), Bytes.toBytes("val_" + i)))
098      .collect(Collectors.toList());
099    table.put(puts);
100    admin.flush(tableName);
101    admin.compact(tableName);
102    Thread.sleep(3000);
103    HRegionServer hRegionServer0 = cluster.getRegionServer(0);
104    HRegionServer hRegionServer1 = cluster.getRegionServer(1);
105    HRegionServer hRegionServer2 = cluster.getRegionServer(2);
106    int numRegions0 = hRegionServer0.getNumberOfOnlineRegions();
107    int numRegions1 = hRegionServer1.getNumberOfOnlineRegions();
108    int numRegions2 = hRegionServer2.getNumberOfOnlineRegions();
109
110    Assert.assertTrue(numRegions0 >= 3);
111    Assert.assertTrue(numRegions1 >= 3);
112    Assert.assertTrue(numRegions2 >= 3);
113    int totalRegions = numRegions0 + numRegions1 + numRegions2;
114
115    // source RS: rs0
116    String sourceRSName = rs0.getAddress().toString();
117
118    // move all regions from rs1 to rs0
119    for (HRegion region : hRegionServer1.getRegions()) {
120      TEST_UTIL.getAdmin().move(region.getRegionInfo().getEncodedNameAsBytes(), rs0);
121    }
122    TEST_UTIL.waitFor(5000, () -> {
123      int newNumRegions0 = hRegionServer0.getNumberOfOnlineRegions();
124      int newNumRegions1 = hRegionServer1.getNumberOfOnlineRegions();
125      return newNumRegions1 == 0 && newNumRegions0 == (numRegions0 + numRegions1);
126    });
127
128    // regionMover obj on rs0. While unloading regions from rs0
129    // with default rackManager, which resolves "/default-rack" for each server, no region
130    // is moved while using unloadFromRack() as all rs belong to same rack.
131    RegionMover.RegionMoverBuilder rmBuilder =
132      new RegionMover.RegionMoverBuilder(sourceRSName, TEST_UTIL.getConfiguration()).ack(true)
133        .maxthreads(8);
134    try (RegionMover regionMover = rmBuilder.build()) {
135      regionMover.unloadFromRack();
136      int newNumRegions0 = hRegionServer0.getNumberOfOnlineRegions();
137      int newNumRegions1 = hRegionServer1.getNumberOfOnlineRegions();
138      int newNumRegions2 = hRegionServer2.getNumberOfOnlineRegions();
139      Assert.assertEquals(0, newNumRegions1);
140      Assert.assertEquals(totalRegions, newNumRegions0 + newNumRegions2);
141    }
142
143    // use custom rackManager, which resolves "rack-1" for rs0 and rs1,
144    // while "rack-2" for rs2. Hence, unloadFromRack() from rs0 should move all
145    // regions that belong to rs0 to rs2 only, and nothing should be moved to rs1
146    // as rs0 and rs1 belong to same rack.
147    rmBuilder.rackManager(new MockRackManager());
148    try (RegionMover regionMover = rmBuilder.build()) {
149      regionMover.unloadFromRack();
150      int newNumRegions0 = hRegionServer0.getNumberOfOnlineRegions();
151      int newNumRegions1 = hRegionServer1.getNumberOfOnlineRegions();
152      int newNumRegions2 = hRegionServer2.getNumberOfOnlineRegions();
153      Assert.assertEquals(0, newNumRegions0);
154      Assert.assertEquals(0, newNumRegions1);
155      Assert.assertEquals(totalRegions, newNumRegions2);
156    }
157
158  }
159
160  private static class MockRackManager extends RackManager {
161
162    private static final String RACK_2 = "rack-2";
163    private static final String RACK_1 = "rack-1";
164
165    @Override
166    public String getRack(ServerName server) {
167      return rs2.equals(server) ? RACK_2 : RACK_1;
168    }
169
170    @Override
171    public List<String> getRack(List<ServerName> servers) {
172      List<String> racks = new ArrayList<>();
173      servers.forEach(serverName -> {
174        if (rs2.equals(serverName)) {
175          racks.add(RACK_2);
176        } else {
177          racks.add(RACK_1);
178        }
179      });
180      return racks;
181    }
182  }
183
184}