hbase-server/src/test/java/org/apache/hadoop/hbase/wal/TestRaceBetweenGetWALAndGetWALs.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.wal;
  19
  20 import static org.junit.Assert.assertNotNull;
  21 import static org.junit.Assert.assertSame;
  22
  23 import java.io.IOException;
  24 import java.util.List;
  25 import java.util.concurrent.ExecutionException;
  26 import java.util.concurrent.ForkJoinPool;
  27 import java.util.concurrent.Future;
  28 import org.apache.hadoop.conf.Configuration;
  29 import org.apache.hadoop.hbase.HBaseClassTestRule;
  30 import org.apache.hadoop.hbase.regionserver.wal.AbstractFSWAL;
  31 import org.apache.hadoop.hbase.testclassification.RegionServerTests;
  32 import org.apache.hadoop.hbase.testclassification.SmallTests;
  33 import org.apache.hadoop.hbase.util.Threads;
  34 import org.junit.ClassRule;
  35 import org.junit.Test;
  36 import org.junit.experimental.categories.Category;
  37 import org.mockito.Mockito;
  38
  39 import org.apache.hbase.thirdparty.com.google.common.collect.Iterables;
  40
  41 /**
  42  * Testcase for HBASE-21503.
  43  */
  44 @Category({ RegionServerTests.class, SmallTests.class })
  45 public class TestRaceBetweenGetWALAndGetWALs {
  46
  47   @ClassRule
  48   public static final HBaseClassTestRule CLASS_RULE =
  49     HBaseClassTestRule.forClass(TestRaceBetweenGetWALAndGetWALs.class);
  50
  51   private static Future<List<WAL>> GET_WALS_FUTURE;
  52
  53   private static final class FSWALProvider extends AbstractFSWALProvider<AbstractFSWAL<?>> {
  54
  55     @Override
  56     protected AbstractFSWAL<?> createWAL() throws IOException {
  57       // just like what may do in the WALListeners, schedule an asynchronous task to call the
  58       // getWALs method.
  59       GET_WALS_FUTURE = ForkJoinPool.commonPool().submit(this::getWALs);
  60       // sleep a while to make the getWALs arrive before we return
  61       Threads.sleep(2000);
  62       return Mockito.mock(AbstractFSWAL.class);
  63     }
  64
  65     @Override
  66     protected void doInit(Configuration conf) throws IOException {
  67     }
  68   }
  69
  70   @Test
  71   public void testRace() throws IOException, InterruptedException, ExecutionException {
  72     FSWALProvider p = new FSWALProvider();
  73     WAL wal = p.getWAL(null);
  74     assertNotNull(GET_WALS_FUTURE);
  75     List<WAL> wals = GET_WALS_FUTURE.get();
  76     assertSame(wal, Iterables.getOnlyElement(wals));
  77   }
  78 }