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.apache.hadoop.hbase.HConstants.META_REPLICAS_NUM;
021import static org.junit.Assert.assertEquals;
022
023import java.io.IOException;
024import java.util.ArrayList;
025import java.util.Arrays;
026import java.util.Collections;
027import java.util.Comparator;
028import java.util.List;
029import org.apache.hadoop.conf.Configuration;
030import org.apache.hadoop.hbase.HBaseClassTestRule;
031import org.apache.hadoop.hbase.HBaseTestingUtility;
032import org.apache.hadoop.hbase.HConstants;
033import org.apache.hadoop.hbase.HRegionLocation;
034import org.apache.hadoop.hbase.ServerName;
035import org.apache.hadoop.hbase.StartMiniClusterOption;
036import org.apache.hadoop.hbase.master.HMaster;
037import org.apache.hadoop.hbase.testclassification.ClientTests;
038import org.apache.hadoop.hbase.testclassification.MediumTests;
039import org.junit.AfterClass;
040import org.junit.BeforeClass;
041import org.junit.ClassRule;
042import org.junit.Test;
043import org.junit.experimental.categories.Category;
044
045@Category({ MediumTests.class, ClientTests.class })
046public class TestMasterRegistry {
047
048  @ClassRule
049  public static final HBaseClassTestRule CLASS_RULE =
050      HBaseClassTestRule.forClass(TestMasterRegistry.class);
051  private static final HBaseTestingUtility TEST_UTIL = new HBaseTestingUtility();
052
053  @BeforeClass
054  public static void setUp() throws Exception {
055    TEST_UTIL.getConfiguration().setInt(META_REPLICAS_NUM, 3);
056    StartMiniClusterOption.Builder builder = StartMiniClusterOption.builder();
057    builder.numMasters(3).numRegionServers(3);
058    TEST_UTIL.startMiniCluster(builder.build());
059  }
060
061  @AfterClass
062  public static void tearDown() throws Exception {
063    TEST_UTIL.shutdownMiniCluster();
064  }
065
066  /**
067   * Generates a string of dummy master addresses in host:port format. Every other hostname won't
068   * have a port number.
069   */
070  private static String generateDummyMastersList(int size) {
071    List<String> masters = new ArrayList<>();
072    for (int i = 0; i < size; i++) {
073      masters.add(" localhost" + (i % 2 == 0 ? ":" + (1000 + i) : ""));
074    }
075    return String.join(",", masters);
076  }
077
078  /**
079   * Makes sure the master registry parses the master end points in the configuration correctly.
080   */
081  @Test
082  public void testMasterAddressParsing() throws IOException {
083    Configuration conf = new Configuration(TEST_UTIL.getConfiguration());
084    int numMasters = 10;
085    conf.set(HConstants.MASTER_ADDRS_KEY, generateDummyMastersList(numMasters));
086    try (MasterRegistry registry = new MasterRegistry(conf)) {
087      List<ServerName> parsedMasters = new ArrayList<>(registry.getParsedMasterServers());
088      // Half of them would be without a port, duplicates are removed.
089      assertEquals(numMasters / 2 + 1, parsedMasters.size());
090      // Sort in the increasing order of port numbers.
091      Collections.sort(parsedMasters, Comparator.comparingInt(ServerName::getPort));
092      for (int i = 0; i < parsedMasters.size(); i++) {
093        ServerName sn = parsedMasters.get(i);
094        assertEquals("localhost", sn.getHostname());
095        if (i == parsedMasters.size() - 1) {
096          // Last entry should be the one with default port.
097          assertEquals(HConstants.DEFAULT_MASTER_PORT, sn.getPort());
098        } else {
099          assertEquals(1000 + (2 * i), sn.getPort());
100        }
101      }
102    }
103  }
104
105  @Test
106  public void testRegistryRPCs() throws Exception {
107    Configuration conf = new Configuration(TEST_UTIL.getConfiguration());
108    HMaster activeMaster = TEST_UTIL.getHBaseCluster().getMaster();
109    final int size =
110      activeMaster.getMetaRegionLocationCache().getMetaRegionLocations().get().size();
111    for (int numHedgedReqs = 1; numHedgedReqs <= size; numHedgedReqs++) {
112      conf.setInt(MasterRegistry.MASTER_REGISTRY_HEDGED_REQS_FANOUT_KEY, numHedgedReqs);
113      try (MasterRegistry registry = new MasterRegistry(conf)) {
114        // Add wait on all replicas being assigned before proceeding w/ test. Failed on occasion
115        // because not all replicas had made it up before test started.
116        RegionReplicaTestHelper.waitUntilAllMetaReplicasAreReady(TEST_UTIL, registry);
117        assertEquals(registry.getClusterId().get(), activeMaster.getClusterId());
118        assertEquals(registry.getActiveMaster().get(), activeMaster.getServerName());
119        List<HRegionLocation> metaLocations =
120          Arrays.asList(registry.getMetaRegionLocations().get().getRegionLocations());
121        List<HRegionLocation> actualMetaLocations =
122          activeMaster.getMetaRegionLocationCache().getMetaRegionLocations().get();
123        Collections.sort(metaLocations);
124        Collections.sort(actualMetaLocations);
125        assertEquals(actualMetaLocations, metaLocations);
126      }
127    }
128  }
129}