hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestZKConnectionRegistry.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.client;
  19
  20 import static org.apache.hadoop.hbase.HConstants.META_REPLICAS_NUM;
  21 import static org.hamcrest.CoreMatchers.instanceOf;
  22 import static org.junit.Assert.assertEquals;
  23 import static org.junit.Assert.assertNotEquals;
  24 import static org.junit.Assert.assertNotNull;
  25 import static org.junit.Assert.assertNotSame;
  26 import static org.junit.Assert.assertThat;
  27 import static org.junit.Assert.fail;
  28 import java.io.IOException;
  29 import java.util.concurrent.ExecutionException;
  30 import java.util.stream.IntStream;
  31 import org.apache.commons.io.IOUtils;
  32 import org.apache.hadoop.conf.Configuration;
  33 import org.apache.hadoop.hbase.HBaseClassTestRule;
  34 import org.apache.hadoop.hbase.HBaseTestingUtility;
  35 import org.apache.hadoop.hbase.HConstants;
  36 import org.apache.hadoop.hbase.HRegionLocation;
  37 import org.apache.hadoop.hbase.RegionLocations;
  38 import org.apache.hadoop.hbase.TableName;
  39 import org.apache.hadoop.hbase.testclassification.ClientTests;
  40 import org.apache.hadoop.hbase.testclassification.MediumTests;
  41 import org.apache.hadoop.hbase.zookeeper.MiniZooKeeperCluster;
  42 import org.apache.hadoop.hbase.zookeeper.ReadOnlyZKClient;
  43 import org.junit.AfterClass;
  44 import org.junit.BeforeClass;
  45 import org.junit.ClassRule;
  46 import org.junit.Test;
  47 import org.junit.experimental.categories.Category;
  48 import org.slf4j.Logger;
  49 import org.slf4j.LoggerFactory;
  50
  51 @Category({ MediumTests.class, ClientTests.class })
  52 public class TestZKConnectionRegistry {
  53
  54   @ClassRule
  55   public static final HBaseClassTestRule CLASS_RULE =
  56     HBaseClassTestRule.forClass(TestZKConnectionRegistry.class);
  57
  58   static final Logger LOG = LoggerFactory.getLogger(TestZKConnectionRegistry.class);
  59   static final HBaseTestingUtility TEST_UTIL = new HBaseTestingUtility();
  60
  61   private static ZKConnectionRegistry REGISTRY;
  62
  63   @BeforeClass
  64   public static void setUp() throws Exception {
  65     TEST_UTIL.getConfiguration().setInt(META_REPLICAS_NUM, 3);
  66     TEST_UTIL.startMiniCluster(3);
  67     Configuration conf = new Configuration(TEST_UTIL.getConfiguration());
  68     // make sure that we do not depend on this config when getting locations for meta replicas, see
  69     // HBASE-21658.
  70     conf.setInt(META_REPLICAS_NUM, 1);
  71     REGISTRY = new ZKConnectionRegistry(conf);
  72   }
  73
  74   @AfterClass
  75   public static void tearDown() throws Exception {
  76     IOUtils.closeQuietly(REGISTRY);
  77     TEST_UTIL.shutdownMiniCluster();
  78   }
  79
  80   @Test
  81   public void test() throws InterruptedException, ExecutionException, IOException {
  82     LOG.info("STARTED TEST");
  83     String clusterId = REGISTRY.getClusterId().get();
  84     String expectedClusterId = TEST_UTIL.getHBaseCluster().getMaster().getClusterId();
  85     assertEquals("Expected " + expectedClusterId + ", found=" + clusterId, expectedClusterId,
  86       clusterId);
  87     assertEquals(TEST_UTIL.getHBaseCluster().getMaster().getServerName(),
  88       REGISTRY.getActiveMaster().get());
  89     RegionReplicaTestHelper
  90       .waitUntilAllMetaReplicasAreReady(TEST_UTIL, REGISTRY);
  91     RegionLocations locs = REGISTRY.getMetaRegionLocations().get();
  92     assertEquals(3, locs.getRegionLocations().length);
  93     IntStream.range(0, 3).forEach(i -> {
  94       HRegionLocation loc = locs.getRegionLocation(i);
  95       assertNotNull("Replica " + i + " doesn't have location", loc);
  96       assertEquals(TableName.META_TABLE_NAME, loc.getRegion().getTable());
  97       assertEquals(i, loc.getRegion().getReplicaId());
  98     });
  99   }
 100
 101   @Test
 102   public void testIndependentZKConnections() throws IOException {
 103     try (ReadOnlyZKClient zk1 = REGISTRY.getZKClient()) {
 104       Configuration otherConf = new Configuration(TEST_UTIL.getConfiguration());
 105       otherConf.set(HConstants.ZOOKEEPER_QUORUM, MiniZooKeeperCluster.HOST);
 106       try (ZKConnectionRegistry otherRegistry = new ZKConnectionRegistry(otherConf)) {
 107         ReadOnlyZKClient zk2 = otherRegistry.getZKClient();
 108         assertNotSame("Using a different configuration / quorum should result in different " +
 109           "backing zk connection.", zk1, zk2);
 110         assertNotEquals(
 111           "Using a different configrution / quorum should be reflected in the zk connection.",
 112           zk1.getConnectString(), zk2.getConnectString());
 113       }
 114     } finally {
 115       LOG.info("DONE!");
 116     }
 117   }
 118
 119   @Test
 120   public void testNoMetaAvailable() throws InterruptedException {
 121     Configuration conf = new Configuration(TEST_UTIL.getConfiguration());
 122     conf.set("zookeeper.znode.metaserver", "whatever");
 123     try (ZKConnectionRegistry registry = new ZKConnectionRegistry(conf)) {
 124       try {
 125         registry.getMetaRegionLocations().get();
 126         fail("Should have failed since we set an incorrect meta znode prefix");
 127       } catch (ExecutionException e) {
 128         assertThat(e.getCause(), instanceOf(IOException.class));
 129       }
 130     }
 131   }
 132 }