hbase-server/src/test/java/org/apache/hadoop/hbase/master/TestAlwaysStandByHMaster.java

   1 /*
   2  * Licensed to the Apache Software Foundation (ASF) under one
   3  * or more contributor license agreements.  See the NOTICE file
   4  * distributed with this work for additional information
   5  * regarding copyright ownership.  The ASF licenses this file
   6  * to you under the Apache License, Version 2.0 (the
   7  * "License"); you may not use this file except in compliance
   8  * with the License.  You may obtain a copy of the License at
   9  *
  10  *     http://www.apache.org/licenses/LICENSE-2.0
  11  *
  12  * Unless required by applicable law or agreed to in writing, software
  13  * distributed under the License is distributed on an "AS IS" BASIS,
  14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  15  * See the License for the specific language governing permissions and
  16  * limitations under the License.
  17  */
  18 package org.apache.hadoop.hbase.master;
  19
  20 import static junit.framework.TestCase.assertTrue;
  21 import static org.junit.Assert.assertEquals;
  22 import static org.junit.Assert.assertFalse;
  23 import static org.junit.Assert.assertNotNull;
  24 import org.apache.hadoop.hbase.HBaseClassTestRule;
  25 import org.apache.hadoop.hbase.HBaseTestingUtility;
  26 import org.apache.hadoop.hbase.MiniClusterRule;
  27 import org.apache.hadoop.hbase.StartMiniClusterOption;
  28 import org.apache.hadoop.hbase.testclassification.MasterTests;
  29 import org.apache.hadoop.hbase.testclassification.MediumTests;
  30 import org.junit.ClassRule;
  31 import org.junit.Test;
  32 import org.junit.experimental.categories.Category;
  33
  34 @Category({MediumTests.class, MasterTests.class})
  35 public class TestAlwaysStandByHMaster {
  36
  37   @ClassRule
  38   public static final HBaseClassTestRule CLASS_RULE =
  39       HBaseClassTestRule.forClass(TestAlwaysStandByHMaster.class);
  40
  41   private static final StartMiniClusterOption OPTION = StartMiniClusterOption.builder().
  42       numAlwaysStandByMasters(1).numMasters(1).numRegionServers(1).build();
  43
  44   @ClassRule
  45   public static final MiniClusterRule miniClusterRule = new MiniClusterRule(OPTION);
  46
  47   /**
  48    * Tests that the AlwaysStandByHMaster does not transition to active state even if no active
  49    * master exists.
  50    */
  51   @Test  public void testAlwaysStandBy() throws Exception {
  52     HBaseTestingUtility testUtil = miniClusterRule.getTestingUtility();
  53     // Make sure there is an active master.
  54     assertNotNull(testUtil.getMiniHBaseCluster().getMaster());
  55     assertEquals(2, testUtil.getMiniHBaseCluster().getMasterThreads().size());
  56     // Kill the only active master.
  57     testUtil.getMiniHBaseCluster().stopMaster(0).join();
  58     // Wait for 5s to make sure the always standby doesn't transition to active state.
  59     assertFalse(testUtil.getMiniHBaseCluster().waitForActiveAndReadyMaster(5000));
  60     // Add a new master.
  61     HMaster newActive = testUtil.getMiniHBaseCluster().startMaster().getMaster();
  62     assertTrue(testUtil.getMiniHBaseCluster().waitForActiveAndReadyMaster(5000));
  63     // Newly added master should be the active.
  64     assertEquals(newActive.getServerName(),
  65         testUtil.getMiniHBaseCluster().getMaster().getServerName());
  66   }
  67 }