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.assignment;
019
020import static org.junit.Assert.assertNotNull;
021import static org.junit.Assert.assertNull;
022
023import java.io.IOException;
024import java.util.ArrayList;
025import java.util.List;
026import java.util.concurrent.CountDownLatch;
027import org.apache.hadoop.conf.Configuration;
028import org.apache.hadoop.hbase.HBaseClassTestRule;
029import org.apache.hadoop.hbase.HBaseTestingUtility;
030import org.apache.hadoop.hbase.HConstants;
031import org.apache.hadoop.hbase.PleaseHoldException;
032import org.apache.hadoop.hbase.ServerName;
033import org.apache.hadoop.hbase.StartMiniClusterOption;
034import org.apache.hadoop.hbase.TableName;
035import org.apache.hadoop.hbase.client.RegionInfo;
036import org.apache.hadoop.hbase.master.HMaster;
037import org.apache.hadoop.hbase.master.MasterServices;
038import org.apache.hadoop.hbase.master.RegionPlan;
039import org.apache.hadoop.hbase.master.RegionServerList;
040import org.apache.hadoop.hbase.master.ServerManager;
041import org.apache.hadoop.hbase.master.region.MasterRegion;
042import org.apache.hadoop.hbase.regionserver.HRegionServer;
043import org.apache.hadoop.hbase.testclassification.MasterTests;
044import org.apache.hadoop.hbase.testclassification.MediumTests;
045import org.apache.hadoop.hbase.util.Bytes;
046import org.junit.AfterClass;
047import org.junit.BeforeClass;
048import org.junit.ClassRule;
049import org.junit.Test;
050import org.junit.experimental.categories.Category;
051
052import org.apache.hadoop.hbase.shaded.protobuf.generated.RegionServerStatusProtos.RegionStateTransition.TransitionCode;
053import org.apache.hadoop.hbase.shaded.protobuf.generated.RegionServerStatusProtos.ReportRegionStateTransitionRequest;
054import org.apache.hadoop.hbase.shaded.protobuf.generated.RegionServerStatusProtos.ReportRegionStateTransitionResponse;
055
056@Category({ MasterTests.class, MediumTests.class })
057public class TestRegionAssignedToMultipleRegionServers {
058
059  @ClassRule
060  public static final HBaseClassTestRule CLASS_RULE =
061    HBaseClassTestRule.forClass(TestRegionAssignedToMultipleRegionServers.class);
062
063  private static final List<ServerName> EXCLUDE_SERVERS = new ArrayList<>();
064
065  private static boolean HALT = false;
066
067  private static boolean KILL = false;
068
069  private static CountDownLatch ARRIVE;
070
071  private static final class ServerManagerForTest extends ServerManager {
072
073    public ServerManagerForTest(MasterServices master, RegionServerList storage) {
074      super(master, storage);
075    }
076
077    @Override
078    public List<ServerName> createDestinationServersList() {
079      return super.createDestinationServersList(EXCLUDE_SERVERS);
080    }
081  }
082
083  private static final class AssignmentManagerForTest extends AssignmentManager {
084
085    public AssignmentManagerForTest(MasterServices master, MasterRegion masterRegion) {
086      super(master, masterRegion);
087    }
088
089    @Override
090    public ReportRegionStateTransitionResponse reportRegionStateTransition(
091      ReportRegionStateTransitionRequest req) throws PleaseHoldException {
092      if (req.getTransition(0).getTransitionCode() == TransitionCode.OPENED) {
093        if (ARRIVE != null) {
094          ARRIVE.countDown();
095          ARRIVE = null;
096        }
097        while (HALT) {
098          try {
099            Thread.sleep(100);
100          } catch (InterruptedException e) {
101            throw new RuntimeException(e);
102          }
103          if (KILL) {
104            throw new PleaseHoldException("Inject error!");
105          }
106        }
107      }
108      return super.reportRegionStateTransition(req);
109    }
110  }
111
112  public static final class HMasterForTest extends HMaster {
113
114    public HMasterForTest(Configuration conf) throws IOException {
115      super(conf);
116    }
117
118    @Override
119    protected AssignmentManager createAssignmentManager(MasterServices master,
120      MasterRegion masterRegion) {
121      return new AssignmentManagerForTest(master, masterRegion);
122    }
123
124    @Override
125    protected ServerManager createServerManager(MasterServices master, RegionServerList storage)
126      throws IOException {
127      setupClusterConnection();
128      return new ServerManagerForTest(master, storage);
129    }
130  }
131
132  private static final HBaseTestingUtility UTIL = new HBaseTestingUtility();
133
134  private static TableName NAME = TableName.valueOf("Assign");
135
136  private static byte[] CF = Bytes.toBytes("cf");
137
138  @BeforeClass
139  public static void setUp() throws Exception {
140    UTIL.getConfiguration().setClass(HConstants.MASTER_IMPL, HMasterForTest.class, HMaster.class);
141    UTIL
142      .startMiniCluster(StartMiniClusterOption.builder().numMasters(2).numRegionServers(2).build());
143    UTIL.createTable(NAME, CF);
144    UTIL.waitTableAvailable(NAME);
145    UTIL.getAdmin().balancerSwitch(false, true);
146  }
147
148  @AfterClass
149  public static void tearDown() throws Exception {
150    UTIL.shutdownMiniCluster();
151  }
152
153  @Test
154  public void test() throws Exception {
155    RegionInfo region = UTIL.getMiniHBaseCluster().getRegions(NAME).get(0).getRegionInfo();
156    AssignmentManager am = UTIL.getMiniHBaseCluster().getMaster().getAssignmentManager();
157    RegionStateNode rsn = am.getRegionStates().getRegionStateNode(region);
158
159    ServerName sn = rsn.getRegionLocation();
160    ARRIVE = new CountDownLatch(1);
161    HALT = true;
162    am.moveAsync(new RegionPlan(region, sn, sn));
163    ARRIVE.await();
164
165    // let's restart the master
166    EXCLUDE_SERVERS.add(rsn.getRegionLocation());
167    KILL = true;
168    HMaster activeMaster = UTIL.getMiniHBaseCluster().getMaster();
169    activeMaster.abort("For testing");
170    activeMaster.join();
171    KILL = false;
172
173    // sleep a while to reproduce the problem, as after the fix in HBASE-21472 the execution logic
174    // is changed so the old code to reproduce the problem can not compile...
175    Thread.sleep(10000);
176    HALT = false;
177    Thread.sleep(5000);
178
179    HRegionServer rs = UTIL.getMiniHBaseCluster().getRegionServer(sn);
180    assertNotNull(rs.getRegion(region.getEncodedName()));
181    assertNull(UTIL.getOtherRegionServer(rs).getRegion(region.getEncodedName()));
182  }
183}