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.apache.hadoop.hbase.HConstants.META_REPLICAS_NUM;
  21 import static org.junit.Assert.assertEquals;
  22 import java.net.UnknownHostException;
  23 import java.util.ArrayList;
  24 import java.util.Arrays;
  25 import java.util.Collections;
  26 import java.util.Comparator;
  27 import java.util.List;
  28 import org.apache.hadoop.conf.Configuration;
  29 import org.apache.hadoop.hbase.HBaseClassTestRule;
  30 import org.apache.hadoop.hbase.HBaseTestingUtility;
  31 import org.apache.hadoop.hbase.HConstants;
  32 import org.apache.hadoop.hbase.HRegionLocation;
  33 import org.apache.hadoop.hbase.ServerName;
  34 import org.apache.hadoop.hbase.StartMiniClusterOption;
  35 import org.apache.hadoop.hbase.master.HMaster;
  36 import org.apache.hadoop.hbase.testclassification.ClientTests;
  37 import org.apache.hadoop.hbase.testclassification.MediumTests;
  38 import org.junit.AfterClass;
  39 import org.junit.BeforeClass;
  40 import org.junit.ClassRule;
  41 import org.junit.Test;
  42 import org.junit.experimental.categories.Category;
  43
  44 @Category({ MediumTests.class, ClientTests.class })
  45 public class TestMasterRegistry {
  46
  47   @ClassRule
  48   public static final HBaseClassTestRule CLASS_RULE =
  49       HBaseClassTestRule.forClass(TestMasterRegistry.class);
  50   private static final HBaseTestingUtility TEST_UTIL = new HBaseTestingUtility();
  51
  52   @BeforeClass
  53   public static void setUp() throws Exception {
  54     TEST_UTIL.getConfiguration().setInt(META_REPLICAS_NUM, 3);
  55     StartMiniClusterOption.Builder builder = StartMiniClusterOption.builder();
  56     builder.numMasters(3).numRegionServers(3);
  57     TEST_UTIL.startMiniCluster(builder.build());
  58   }
  59
  60   @AfterClass
  61   public static void tearDown() throws Exception {
  62     TEST_UTIL.shutdownMiniCluster();
  63   }
  64
  65   /**
  66    * Generates a string of dummy master addresses in host:port format. Every other hostname won't
  67    * have a port number.
  68    */
  69   private static String generateDummyMastersList(int size) {
  70     List<String> masters = new ArrayList<>();
  71     for (int i = 0; i < size; i++) {
  72       masters.add(" localhost" + (i % 2 == 0 ? ":" + (1000 + i) : ""));
  73     }
  74     return String.join(",", masters);
  75   }
  76
  77   /**
  78    * Makes sure the master registry parses the master end points in the configuration correctly.
  79    */
  80   @Test public void testMasterAddressParsing() throws UnknownHostException {
  81     Configuration conf = new Configuration(TEST_UTIL.getConfiguration());
  82     int numMasters = 10;
  83     conf.set(HConstants.MASTER_ADDRS_KEY, generateDummyMastersList(numMasters));
  84     try (MasterRegistry registry = new MasterRegistry(conf)) {
  85       List<ServerName> parsedMasters = new ArrayList<>(registry.getParsedMasterServers());
  86       // Half of them would be without a port, duplicates are removed.
  87       assertEquals(numMasters/2 + 1, parsedMasters.size());
  88       // Sort in the increasing order of port numbers.
  89       Collections.sort(parsedMasters, Comparator.comparingInt(ServerName::getPort));
  90       for (int i = 0; i < parsedMasters.size(); i++) {
  91         ServerName sn = parsedMasters.get(i);
  92         assertEquals("localhost", sn.getHostname());
  93         if (i == parsedMasters.size() - 1) {
  94           // Last entry should be the one with default port.
  95           assertEquals(HConstants.DEFAULT_MASTER_PORT, sn.getPort());
  96         } else {
  97           assertEquals(1000 + (2 * i), sn.getPort());
  98         }
  99       }
 100     }
 101   }
 102
 103   @Test public void testRegistryRPCs() throws Exception {
 104     Configuration conf = new Configuration(TEST_UTIL.getConfiguration());
 105     HMaster activeMaster = TEST_UTIL.getHBaseCluster().getMaster();
 106     for (int numHedgedReqs = 1; numHedgedReqs <=3; numHedgedReqs++) {
 107       if (numHedgedReqs == 1) {
 108         conf.setBoolean(HConstants.MASTER_REGISTRY_ENABLE_HEDGED_READS_KEY, false);
 109       } else {
 110         conf.setBoolean(HConstants.MASTER_REGISTRY_ENABLE_HEDGED_READS_KEY, true);
 111       }
 112       conf.setInt(HConstants.HBASE_RPCS_HEDGED_REQS_FANOUT_KEY, numHedgedReqs);
 113       try (MasterRegistry registry = new MasterRegistry(conf)) {
 114         assertEquals(registry.getClusterId().get(), activeMaster.getClusterId());
 115         assertEquals(registry.getActiveMaster().get(), activeMaster.getServerName());
 116         List<HRegionLocation> metaLocations =
 117             Arrays.asList(registry.getMetaRegionLocations().get().getRegionLocations());
 118         List<HRegionLocation> actualMetaLocations = activeMaster.getMetaRegionLocationCache()
 119             .getMetaRegionLocations().get();
 120         Collections.sort(metaLocations);
 121         Collections.sort(actualMetaLocations);
 122         assertEquals(actualMetaLocations, metaLocations);
 123       }
 124     }
 125   }
 126 }