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.hamcrest.CoreMatchers.instanceOf;
021import static org.hamcrest.MatcherAssert.assertThat;
022import static org.junit.Assert.assertEquals;
023import static org.junit.Assert.assertNotEquals;
024import static org.junit.Assert.assertNotNull;
025import static org.junit.Assert.assertNotSame;
026import static org.junit.Assert.fail;
027
028import java.io.IOException;
029import java.util.concurrent.ExecutionException;
030import java.util.stream.IntStream;
031import org.apache.hadoop.conf.Configuration;
032import org.apache.hadoop.hbase.HBaseClassTestRule;
033import org.apache.hadoop.hbase.HBaseTestingUtil;
034import org.apache.hadoop.hbase.HConstants;
035import org.apache.hadoop.hbase.HRegionLocation;
036import org.apache.hadoop.hbase.RegionLocations;
037import org.apache.hadoop.hbase.TableName;
038import org.apache.hadoop.hbase.testclassification.ClientTests;
039import org.apache.hadoop.hbase.testclassification.MediumTests;
040import org.apache.hadoop.hbase.zookeeper.MiniZooKeeperCluster;
041import org.apache.hadoop.hbase.zookeeper.ReadOnlyZKClient;
042import org.junit.AfterClass;
043import org.junit.BeforeClass;
044import org.junit.ClassRule;
045import org.junit.Test;
046import org.junit.experimental.categories.Category;
047import org.slf4j.Logger;
048import org.slf4j.LoggerFactory;
049
050import org.apache.hbase.thirdparty.com.google.common.io.Closeables;
051
052@Category({ MediumTests.class, ClientTests.class })
053public class TestZKConnectionRegistry {
054
055  @ClassRule
056  public static final HBaseClassTestRule CLASS_RULE =
057    HBaseClassTestRule.forClass(TestZKConnectionRegistry.class);
058
059  static final Logger LOG = LoggerFactory.getLogger(TestZKConnectionRegistry.class);
060  static final HBaseTestingUtil TEST_UTIL = new HBaseTestingUtil();
061
062  private static ZKConnectionRegistry REGISTRY;
063
064  @BeforeClass
065  public static void setUp() throws Exception {
066    TEST_UTIL.startMiniCluster(3);
067    HBaseTestingUtil.setReplicas(TEST_UTIL.getAdmin(), TableName.META_TABLE_NAME, 3);
068    REGISTRY = new ZKConnectionRegistry(TEST_UTIL.getConfiguration(), null);
069  }
070
071  @AfterClass
072  public static void tearDown() throws Exception {
073    Closeables.close(REGISTRY, true);
074    TEST_UTIL.shutdownMiniCluster();
075  }
076
077  @Test
078  public void test() throws InterruptedException, ExecutionException, IOException {
079    LOG.info("STARTED TEST");
080    String clusterId = REGISTRY.getClusterId().get();
081    String expectedClusterId = TEST_UTIL.getHBaseCluster().getMaster().getClusterId();
082    assertEquals("Expected " + expectedClusterId + ", found=" + clusterId, expectedClusterId,
083      clusterId);
084    assertEquals(TEST_UTIL.getHBaseCluster().getMaster().getServerName(),
085      REGISTRY.getActiveMaster().get());
086    RegionReplicaTestHelper.waitUntilAllMetaReplicasAreReady(TEST_UTIL, REGISTRY);
087    RegionLocations locs = REGISTRY.getMetaRegionLocations().get();
088    assertEquals(3, locs.getRegionLocations().length);
089    IntStream.range(0, 3).forEach(i -> {
090      HRegionLocation loc = locs.getRegionLocation(i);
091      assertNotNull("Replica " + i + " doesn't have location", loc);
092      assertEquals(TableName.META_TABLE_NAME, loc.getRegion().getTable());
093      assertEquals(i, loc.getRegion().getReplicaId());
094    });
095  }
096
097  @Test
098  public void testIndependentZKConnections() throws IOException {
099    try (ReadOnlyZKClient zk1 = REGISTRY.getZKClient()) {
100      Configuration otherConf = new Configuration(TEST_UTIL.getConfiguration());
101      otherConf.set(HConstants.ZOOKEEPER_QUORUM, MiniZooKeeperCluster.HOST);
102      try (ZKConnectionRegistry otherRegistry = new ZKConnectionRegistry(otherConf, null)) {
103        ReadOnlyZKClient zk2 = otherRegistry.getZKClient();
104        assertNotSame("Using a different configuration / quorum should result in different "
105          + "backing zk connection.", zk1, zk2);
106        assertNotEquals(
107          "Using a different configrution / quorum should be reflected in the zk connection.",
108          zk1.getConnectString(), zk2.getConnectString());
109      }
110    } finally {
111      LOG.info("DONE!");
112    }
113  }
114
115  @Test
116  public void testNoMetaAvailable() throws InterruptedException {
117    Configuration conf = new Configuration(TEST_UTIL.getConfiguration());
118    conf.set("zookeeper.znode.metaserver", "whatever");
119    try (ZKConnectionRegistry registry = new ZKConnectionRegistry(conf, null)) {
120      try {
121        registry.getMetaRegionLocations().get();
122        fail("Should have failed since we set an incorrect meta znode prefix");
123      } catch (ExecutionException e) {
124        assertThat(e.getCause(), instanceOf(IOException.class));
125      }
126    }
127  }
128}