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.client;
019
020import static org.junit.Assert.assertEquals;
021
022import java.util.concurrent.CountDownLatch;
023import java.util.concurrent.ForkJoinPool;
024import java.util.concurrent.atomic.AtomicInteger;
025import java.util.stream.Collectors;
026import java.util.stream.IntStream;
027import org.apache.hadoop.hbase.HBaseClassTestRule;
028import org.apache.hadoop.hbase.HBaseTestingUtility;
029import org.apache.hadoop.hbase.TableName;
030import org.apache.hadoop.hbase.Waiter.ExplainingPredicate;
031import org.apache.hadoop.hbase.testclassification.ClientTests;
032import org.apache.hadoop.hbase.testclassification.MediumTests;
033import org.apache.hadoop.hbase.util.Bytes;
034import org.junit.AfterClass;
035import org.junit.BeforeClass;
036import org.junit.ClassRule;
037import org.junit.Test;
038import org.junit.experimental.categories.Category;
039
040@Category({ MediumTests.class, ClientTests.class })
041public class TestAsyncTableScannerCloseWhileSuspending {
042
043  @ClassRule
044  public static final HBaseClassTestRule CLASS_RULE =
045    HBaseClassTestRule.forClass(TestAsyncTableScannerCloseWhileSuspending.class);
046
047  private static final HBaseTestingUtility TEST_UTIL = new HBaseTestingUtility();
048
049  private static TableName TABLE_NAME = TableName.valueOf("async");
050
051  private static byte[] FAMILY = Bytes.toBytes("cf");
052
053  private static byte[] CQ = Bytes.toBytes("cq");
054
055  private static AsyncConnection CONN;
056
057  private static AsyncTable<?> TABLE;
058
059  @BeforeClass
060  public static void setUp() throws Exception {
061    TEST_UTIL.startMiniCluster(1);
062    TEST_UTIL.createTable(TABLE_NAME, FAMILY);
063    CONN = ConnectionFactory.createAsyncConnection(TEST_UTIL.getConfiguration()).get();
064    TABLE = CONN.getTable(TABLE_NAME, ForkJoinPool.commonPool());
065    TABLE.putAll(IntStream.range(0, 100).mapToObj(
066      i -> new Put(Bytes.toBytes(String.format("%02d", i))).addColumn(FAMILY, CQ, Bytes.toBytes(i)))
067      .collect(Collectors.toList())).get();
068  }
069
070  @AfterClass
071  public static void tearDown() throws Exception {
072    CONN.close();
073    TEST_UTIL.shutdownMiniCluster();
074  }
075
076  private int getScannersCount() {
077    return TEST_UTIL.getHBaseCluster().getRegionServerThreads().stream()
078      .map(t -> t.getRegionServer()).mapToInt(rs -> rs.getRSRpcServices().getScannersCount()).sum();
079  }
080
081  @Test
082  public void testCloseScannerWhileSuspending() throws Exception {
083    final AtomicInteger onNextCounter = new AtomicInteger(0);
084    final CountDownLatch latch = new CountDownLatch(1);
085    final Scan scan = new Scan().setMaxResultSize(1);
086    final AsyncTableResultScanner scanner = new AsyncTableResultScanner(TABLE_NAME, scan, 1) {
087      @Override
088      public void onNext(Result[] results, ScanController controller) {
089        onNextCounter.incrementAndGet();
090        super.onNext(results, controller);
091      }
092
093      @Override
094      public void onComplete() {
095        super.onComplete();
096        latch.countDown();
097      }
098    };
099
100    CONN.getTable(TABLE_NAME).scan(scan, scanner);
101
102    TEST_UTIL.waitFor(10000, 100, new ExplainingPredicate<Exception>() {
103
104      @Override
105      public boolean evaluate() throws Exception {
106        return scanner.isSuspended();
107      }
108
109      @Override
110      public String explainFailure() throws Exception {
111        return "The given scanner has been suspended in time";
112      }
113    });
114    assertEquals(1, getScannersCount());
115    assertEquals(1, onNextCounter.get());
116
117    scanner.close();
118    TEST_UTIL.waitFor(10000, 100, new ExplainingPredicate<Exception>() {
119
120      @Override
121      public boolean evaluate() throws Exception {
122        return getScannersCount() == 0;
123      }
124
125      @Override
126      public String explainFailure() throws Exception {
127        return "Still have " + getScannersCount() + " scanners opened";
128      }
129    });
130    latch.await();
131    assertEquals(1, onNextCounter.get());
132  }
133}