hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestMasterRegistry.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.junit.Assert.assertEquals;
  21 import static org.junit.Assert.assertFalse;
  22 import static org.junit.Assert.assertTrue;
  23
  24 import java.io.IOException;
  25 import java.util.ArrayList;
  26 import java.util.Arrays;
  27 import java.util.Collections;
  28 import java.util.Comparator;
  29 import java.util.List;
  30 import java.util.Set;
  31 import org.apache.hadoop.conf.Configuration;
  32 import org.apache.hadoop.hbase.HBaseClassTestRule;
  33 import org.apache.hadoop.hbase.HBaseTestingUtil;
  34 import org.apache.hadoop.hbase.HConstants;
  35 import org.apache.hadoop.hbase.HRegionLocation;
  36 import org.apache.hadoop.hbase.ServerName;
  37 import org.apache.hadoop.hbase.StartTestingClusterOption;
  38 import org.apache.hadoop.hbase.TableName;
  39 import org.apache.hadoop.hbase.Waiter;
  40 import org.apache.hadoop.hbase.master.HMaster;
  41 import org.apache.hadoop.hbase.testclassification.ClientTests;
  42 import org.apache.hadoop.hbase.testclassification.MediumTests;
  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
  49 import org.apache.hbase.thirdparty.com.google.common.base.Preconditions;
  50
  51 @Category({ MediumTests.class, ClientTests.class })
  52 public class TestMasterRegistry {
  53
  54   @ClassRule
  55   public static final HBaseClassTestRule CLASS_RULE =
  56     HBaseClassTestRule.forClass(TestMasterRegistry.class);
  57   private static final HBaseTestingUtil TEST_UTIL = new HBaseTestingUtil();
  58
  59   @BeforeClass
  60   public static void setUp() throws Exception {
  61     StartTestingClusterOption.Builder builder = StartTestingClusterOption.builder();
  62     builder.numMasters(3).numRegionServers(3);
  63     TEST_UTIL.startMiniCluster(builder.build());
  64     HBaseTestingUtil.setReplicas(TEST_UTIL.getAdmin(), TableName.META_TABLE_NAME, 3);
  65   }
  66
  67   @AfterClass
  68   public static void tearDown() throws Exception {
  69     TEST_UTIL.shutdownMiniCluster();
  70   }
  71
  72   /**
  73    * Generates a string of dummy master addresses in host:port format. Every other hostname won't
  74    * have a port number.
  75    */
  76   private static String generateDummyMastersList(int size) {
  77     List<String> masters = new ArrayList<>();
  78     for (int i = 0; i < size; i++) {
  79       masters.add(" localhost" + (i % 2 == 0 ? ":" + (1000 + i) : ""));
  80     }
  81     return String.join(",", masters);
  82   }
  83
  84   /**
  85    * Makes sure the master registry parses the master end points in the configuration correctly.
  86    */
  87   @Test
  88   public void testMasterAddressParsing() throws IOException {
  89     Configuration conf = new Configuration(TEST_UTIL.getConfiguration());
  90     int numMasters = 10;
  91     conf.set(HConstants.MASTER_ADDRS_KEY, generateDummyMastersList(numMasters));
  92     try (MasterRegistry registry = new MasterRegistry(conf)) {
  93       List<ServerName> parsedMasters = new ArrayList<>(registry.getParsedServers());
  94       // Half of them would be without a port, duplicates are removed.
  95       assertEquals(numMasters / 2 + 1, parsedMasters.size());
  96       // Sort in the increasing order of port numbers.
  97       Collections.sort(parsedMasters, Comparator.comparingInt(ServerName::getPort));
  98       for (int i = 0; i < parsedMasters.size(); i++) {
  99         ServerName sn = parsedMasters.get(i);
 100         assertEquals("localhost", sn.getHostname());
 101         if (i == parsedMasters.size() - 1) {
 102           // Last entry should be the one with default port.
 103           assertEquals(HConstants.DEFAULT_MASTER_PORT, sn.getPort());
 104         } else {
 105           assertEquals(1000 + (2 * i), sn.getPort());
 106         }
 107       }
 108     }
 109   }
 110
 111   @Test
 112   public void testRegistryRPCs() throws Exception {
 113     Configuration conf = new Configuration(TEST_UTIL.getConfiguration());
 114     HMaster activeMaster = TEST_UTIL.getHBaseCluster().getMaster();
 115     final int size = activeMaster.getMetaLocations().size();
 116     for (int numHedgedReqs = 1; numHedgedReqs <= size; numHedgedReqs++) {
 117       conf.setInt(MasterRegistry.MASTER_REGISTRY_HEDGED_REQS_FANOUT_KEY, numHedgedReqs);
 118       try (MasterRegistry registry = new MasterRegistry(conf)) {
 119         // Add wait on all replicas being assigned before proceeding w/ test. Failed on occasion
 120         // because not all replicas had made it up before test started.
 121         RegionReplicaTestHelper.waitUntilAllMetaReplicasAreReady(TEST_UTIL, registry);
 122         assertEquals(registry.getClusterId().get(), activeMaster.getClusterId());
 123         assertEquals(registry.getActiveMaster().get(), activeMaster.getServerName());
 124         List<HRegionLocation> metaLocations =
 125           Arrays.asList(registry.getMetaRegionLocations().get().getRegionLocations());
 126         List<HRegionLocation> actualMetaLocations = activeMaster.getMetaLocations();
 127         Collections.sort(metaLocations);
 128         Collections.sort(actualMetaLocations);
 129         assertEquals(actualMetaLocations, metaLocations);
 130       }
 131     }
 132   }
 133
 134   /**
 135    * Tests that the list of masters configured in the MasterRegistry is dynamically refreshed in the
 136    * event of errors.
 137    */
 138   @Test
 139   public void testDynamicMasterConfigurationRefresh() throws Exception {
 140     Configuration conf = new Configuration(TEST_UTIL.getConfiguration());
 141     String currentMasterAddrs = Preconditions.checkNotNull(conf.get(HConstants.MASTER_ADDRS_KEY));
 142     HMaster activeMaster = TEST_UTIL.getHBaseCluster().getMaster();
 143     String clusterId = activeMaster.getClusterId();
 144     // Add a non-working master
 145     ServerName badServer = ServerName.valueOf("localhost", 1234, -1);
 146     conf.set(HConstants.MASTER_ADDRS_KEY, badServer.toShortString() + "," + currentMasterAddrs);
 147     // Set the hedging fan out so that all masters are queried.
 148     conf.setInt(MasterRegistry.MASTER_REGISTRY_HEDGED_REQS_FANOUT_KEY, 4);
 149     // Do not limit the number of refreshes during the test run.
 150     conf.setLong(MasterRegistry.MASTER_REGISTRY_MIN_SECS_BETWEEN_REFRESHES, 0);
 151     try (MasterRegistry registry = new MasterRegistry(conf)) {
 152       final Set<ServerName> masters = registry.getParsedServers();
 153       assertTrue(masters.contains(badServer));
 154       // Make a registry RPC, this should trigger a refresh since one of the hedged RPC fails.
 155       assertEquals(registry.getClusterId().get(), clusterId);
 156       // Wait for new set of masters to be populated.
 157       TEST_UTIL.waitFor(5000,
 158         (Waiter.Predicate<Exception>) () -> !registry.getParsedServers().equals(masters));
 159       // new set of masters should not include the bad server
 160       final Set<ServerName> newMasters = registry.getParsedServers();
 161       // Bad one should be out.
 162       assertEquals(3, newMasters.size());
 163       assertFalse(newMasters.contains(badServer));
 164       // Kill the active master
 165       activeMaster.stopMaster();
 166       TEST_UTIL.waitFor(10000,
 167         () -> TEST_UTIL.getMiniHBaseCluster().getLiveMasterThreads().size() == 2);
 168       TEST_UTIL.getMiniHBaseCluster().waitForActiveAndReadyMaster(10000);
 169       // Wait until the killed master de-registered. This should also trigger another refresh.
 170       TEST_UTIL.waitFor(10000, () -> registry.getMasters().get().size() == 2);
 171       TEST_UTIL.waitFor(20000, () -> registry.getParsedServers().size() == 2);
 172       final Set<ServerName> newMasters2 = registry.getParsedServers();
 173       assertEquals(2, newMasters2.size());
 174       assertFalse(newMasters2.contains(activeMaster.getServerName()));
 175     } finally {
 176       // Reset the state, add a killed master.
 177       TEST_UTIL.getMiniHBaseCluster().startMaster();
 178     }
 179   }
 180 }