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.zookeeper;
019
020import static org.junit.jupiter.api.Assertions.assertTrue;
021
022import java.io.IOException;
023import java.lang.reflect.Field;
024import org.apache.hadoop.conf.Configuration;
025import org.apache.hadoop.hbase.Abortable;
026import org.apache.hadoop.hbase.HBaseZKTestingUtil;
027import org.apache.hadoop.hbase.HConstants;
028import org.apache.hadoop.hbase.testclassification.MediumTests;
029import org.apache.hadoop.hbase.testclassification.ZKTests;
030import org.apache.hadoop.hbase.util.Bytes;
031import org.apache.zookeeper.CreateMode;
032import org.apache.zookeeper.KeeperException;
033import org.apache.zookeeper.Watcher;
034import org.apache.zookeeper.ZooDefs.Ids;
035import org.apache.zookeeper.ZooKeeper;
036import org.apache.zookeeper.data.Stat;
037import org.junit.jupiter.api.AfterAll;
038import org.junit.jupiter.api.BeforeAll;
039import org.junit.jupiter.api.Tag;
040import org.junit.jupiter.api.Test;
041
042@Tag(ZKTests.TAG)
043@Tag(MediumTests.TAG)
044public class TestRecoverableZooKeeper {
045
046  private final static HBaseZKTestingUtil TEST_UTIL = new HBaseZKTestingUtil();
047
048  private Abortable abortable = new Abortable() {
049    @Override
050    public void abort(String why, Throwable e) {
051    }
052
053    @Override
054    public boolean isAborted() {
055      return false;
056    }
057  };
058
059  @BeforeAll
060  public static void setUpBeforeClass() throws Exception {
061    TEST_UTIL.startMiniZKCluster();
062  }
063
064  @AfterAll
065  public static void tearDownAfterClass() throws Exception {
066    TEST_UTIL.shutdownMiniZKCluster();
067  }
068
069  @Test
070  public void testSetDataVersionMismatchInLoop() throws Exception {
071    String znode = "/hbase/splitWAL/9af7cfc9b15910a0b3d714bf40a3248f";
072    Configuration conf = TEST_UTIL.getConfiguration();
073    ZKWatcher zkw = new ZKWatcher(conf, "testSetDataVersionMismatchInLoop", abortable, true);
074    String ensemble = ZKConfig.getZKQuorumServersString(conf);
075    RecoverableZooKeeper rzk = RecoverableZooKeeper.connect(conf, ensemble, zkw, null, null);
076    rzk.create(znode, new byte[0], Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
077    rzk.setData(znode, Bytes.toBytes("OPENING"), 0);
078    Field zkField = RecoverableZooKeeper.class.getDeclaredField("zk");
079    zkField.setAccessible(true);
080    int timeout = conf.getInt(HConstants.ZK_SESSION_TIMEOUT, HConstants.DEFAULT_ZK_SESSION_TIMEOUT);
081    ZookeeperStub zkStub = new ZookeeperStub(ensemble, timeout, zkw);
082    zkStub.setThrowExceptionInNumOperations(1);
083    zkField.set(rzk, zkStub);
084    byte[] opened = Bytes.toBytes("OPENED");
085    rzk.setData(znode, opened, 1);
086    byte[] data = rzk.getData(znode, false, new Stat());
087    assertTrue(Bytes.equals(opened, data));
088  }
089
090  static class ZookeeperStub extends ZooKeeper {
091    private int throwExceptionInNumOperations;
092
093    ZookeeperStub(String connectString, int sessionTimeout, Watcher watcher) throws IOException {
094      super(connectString, sessionTimeout, watcher);
095    }
096
097    void setThrowExceptionInNumOperations(int throwExceptionInNumOperations) {
098      this.throwExceptionInNumOperations = throwExceptionInNumOperations;
099    }
100
101    private void checkThrowKeeperException() throws KeeperException {
102      if (throwExceptionInNumOperations == 1) {
103        throwExceptionInNumOperations = 0;
104        throw new KeeperException.ConnectionLossException();
105      }
106      if (throwExceptionInNumOperations > 0) {
107        throwExceptionInNumOperations--;
108      }
109    }
110
111    @Override
112    public Stat setData(String path, byte[] data, int version)
113      throws KeeperException, InterruptedException {
114      Stat stat = super.setData(path, data, version);
115      checkThrowKeeperException();
116      return stat;
117    }
118  }
119}