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;
021import static org.junit.Assert.assertFalse;
022import static org.junit.Assert.assertTrue;
023
024import java.util.ArrayList;
025import java.util.Arrays;
026import java.util.Collections;
027import java.util.Comparator;
028import java.util.List;
029import java.util.Set;
030import org.apache.hadoop.conf.Configuration;
031import org.apache.hadoop.hbase.HBaseClassTestRule;
032import org.apache.hadoop.hbase.HBaseTestingUtility;
033import org.apache.hadoop.hbase.HConstants;
034import org.apache.hadoop.hbase.HRegionLocation;
035import org.apache.hadoop.hbase.ServerName;
036import org.apache.hadoop.hbase.StartMiniClusterOption;
037import org.apache.hadoop.hbase.TableName;
038import org.apache.hadoop.hbase.Waiter;
039import org.apache.hadoop.hbase.master.HMaster;
040import org.apache.hadoop.hbase.security.User;
041import org.apache.hadoop.hbase.testclassification.ClientTests;
042import org.apache.hadoop.hbase.testclassification.MediumTests;
043import org.junit.AfterClass;
044import org.junit.BeforeClass;
045import org.junit.ClassRule;
046import org.junit.Test;
047import org.junit.experimental.categories.Category;
048
049import org.apache.hbase.thirdparty.com.google.common.base.Preconditions;
050
051@Category({ MediumTests.class, ClientTests.class })
052public class TestMasterRegistry {
053
054  @ClassRule
055  public static final HBaseClassTestRule CLASS_RULE =
056    HBaseClassTestRule.forClass(TestMasterRegistry.class);
057  private static final HBaseTestingUtility TEST_UTIL = new HBaseTestingUtility();
058
059  @BeforeClass
060  public static void setUp() throws Exception {
061    StartMiniClusterOption.Builder builder = StartMiniClusterOption.builder();
062    builder.numMasters(3).numRegionServers(3);
063    TEST_UTIL.startMiniCluster(builder.build());
064    HBaseTestingUtility.setReplicas(TEST_UTIL.getAdmin(), TableName.META_TABLE_NAME, 3);
065  }
066
067  @AfterClass
068  public static void tearDown() throws Exception {
069    TEST_UTIL.shutdownMiniCluster();
070  }
071
072  /**
073   * Generates a string of dummy master addresses in host:port format. Every other hostname won't
074   * have a port number.
075   */
076  private static String generateDummyMastersList(int size) {
077    List<String> masters = new ArrayList<>();
078    for (int i = 0; i < size; i++) {
079      masters.add(" localhost" + (i % 2 == 0 ? ":" + (1000 + i) : ""));
080    }
081    return String.join(",", masters);
082  }
083
084  /**
085   * Makes sure the master registry parses the master end points in the configuration correctly.
086   */
087  @Test
088  public void testMasterAddressParsing() throws Exception {
089    Configuration conf = new Configuration(TEST_UTIL.getConfiguration());
090    int numMasters = 10;
091    conf.set(HConstants.MASTER_ADDRS_KEY, generateDummyMastersList(numMasters));
092    List<ServerName> parsedMasters = new ArrayList<>(MasterRegistry.parseMasterAddrs(conf));
093    // Half of them would be without a port, duplicates are removed.
094    assertEquals(numMasters / 2 + 1, parsedMasters.size());
095    // Sort in the increasing order of port numbers.
096    Collections.sort(parsedMasters, Comparator.comparingInt(ServerName::getPort));
097    for (int i = 0; i < parsedMasters.size(); i++) {
098      ServerName sn = parsedMasters.get(i);
099      assertEquals("localhost", sn.getHostname());
100      if (i == parsedMasters.size() - 1) {
101        // Last entry should be the one with default port.
102        assertEquals(HConstants.DEFAULT_MASTER_PORT, sn.getPort());
103      } else {
104        assertEquals(1000 + (2 * i), sn.getPort());
105      }
106    }
107  }
108
109  @Test
110  public void testMasterPortDefaults() throws Exception {
111    Configuration conf = new Configuration(TEST_UTIL.getConfiguration());
112    conf.set(HConstants.MASTER_ADDRS_KEY, "localhost");
113    List<ServerName> parsedMasters = new ArrayList<>(MasterRegistry.parseMasterAddrs(conf));
114    ServerName sn = parsedMasters.get(0);
115    assertEquals(HConstants.DEFAULT_MASTER_PORT, sn.getPort());
116    final int CUSTOM_MASTER_PORT = 9999;
117    conf.setInt(HConstants.MASTER_PORT, CUSTOM_MASTER_PORT);
118    parsedMasters = new ArrayList<>(MasterRegistry.parseMasterAddrs(conf));
119    sn = parsedMasters.get(0);
120    assertEquals(CUSTOM_MASTER_PORT, sn.getPort());
121  }
122
123  @Test
124  public void testRegistryRPCs() throws Exception {
125    Configuration conf = new Configuration(TEST_UTIL.getConfiguration());
126    HMaster activeMaster = TEST_UTIL.getHBaseCluster().getMaster();
127    final int size =
128      activeMaster.getMetaRegionLocationCache().getMetaRegionLocations().get().size();
129    for (int numHedgedReqs = 1; numHedgedReqs <= size; numHedgedReqs++) {
130      conf.setInt(MasterRegistry.MASTER_REGISTRY_HEDGED_REQS_FANOUT_KEY, numHedgedReqs);
131      try (MasterRegistry registry = new MasterRegistry(conf, User.getCurrent())) {
132        // Add wait on all replicas being assigned before proceeding w/ test. Failed on occasion
133        // because not all replicas had made it up before test started.
134        RegionReplicaTestHelper.waitUntilAllMetaReplicasAreReady(TEST_UTIL, registry);
135        assertEquals(registry.getClusterId().get(), activeMaster.getClusterId());
136        assertEquals(registry.getActiveMaster().get(), activeMaster.getServerName());
137        List<HRegionLocation> metaLocations =
138          Arrays.asList(registry.getMetaRegionLocations().get().getRegionLocations());
139        List<HRegionLocation> actualMetaLocations =
140          activeMaster.getMetaRegionLocationCache().getMetaRegionLocations().get();
141        Collections.sort(metaLocations);
142        Collections.sort(actualMetaLocations);
143        assertEquals(actualMetaLocations, metaLocations);
144      }
145    }
146  }
147
148  /**
149   * Tests that the list of masters configured in the MasterRegistry is dynamically refreshed in the
150   * event of errors.
151   */
152  @Test
153  public void testDynamicMasterConfigurationRefresh() throws Exception {
154    Configuration conf = new Configuration(TEST_UTIL.getConfiguration());
155    String currentMasterAddrs = Preconditions.checkNotNull(conf.get(HConstants.MASTER_ADDRS_KEY));
156    HMaster activeMaster = TEST_UTIL.getHBaseCluster().getMaster();
157    String clusterId = activeMaster.getClusterId();
158    // Add a non-working master
159    ServerName badServer = ServerName.valueOf("localhost", 1234, -1);
160    conf.set(HConstants.MASTER_ADDRS_KEY, badServer.toShortString() + "," + currentMasterAddrs);
161    // Set the hedging fan out so that all masters are queried.
162    conf.setInt(MasterRegistry.MASTER_REGISTRY_HEDGED_REQS_FANOUT_KEY, 4);
163    // Do not limit the number of refreshes during the test run.
164    conf.setLong(MasterRegistry.MASTER_REGISTRY_MIN_SECS_BETWEEN_REFRESHES, 0);
165    try (MasterRegistry registry = new MasterRegistry(conf, User.getCurrent())) {
166      final Set<ServerName> masters = registry.getParsedServers();
167      assertTrue(masters.contains(badServer));
168      // Make a registry RPC, this should trigger a refresh since one of the hedged RPC fails.
169      assertEquals(registry.getClusterId().get(), clusterId);
170      // Wait for new set of masters to be populated.
171      TEST_UTIL.waitFor(5000,
172        (Waiter.Predicate<Exception>) () -> !registry.getParsedServers().equals(masters));
173      // new set of masters should not include the bad server
174      final Set<ServerName> newMasters = registry.getParsedServers();
175      // Bad one should be out.
176      assertEquals(3, newMasters.size());
177      assertFalse(newMasters.contains(badServer));
178      // Kill the active master
179      activeMaster.stopMaster();
180      TEST_UTIL.waitFor(10000,
181        () -> TEST_UTIL.getMiniHBaseCluster().getLiveMasterThreads().size() == 2);
182      TEST_UTIL.getMiniHBaseCluster().waitForActiveAndReadyMaster(10000);
183      // Wait until the killed master de-registered. This should also trigger another refresh.
184      TEST_UTIL.waitFor(10000, () -> registry.getMasters().get().size() == 2);
185      TEST_UTIL.waitFor(20000, () -> registry.getParsedServers().size() == 2);
186      final Set<ServerName> newMasters2 = registry.getParsedServers();
187      assertEquals(2, newMasters2.size());
188      assertFalse(newMasters2.contains(activeMaster.getServerName()));
189    } finally {
190      // Reset the state, add a killed master.
191      TEST_UTIL.getMiniHBaseCluster().startMaster();
192    }
193  }
194}