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;
021
022import java.util.Optional;
023import org.apache.commons.io.IOUtils;
024import org.apache.hadoop.hbase.HBaseClassTestRule;
025import org.apache.hadoop.hbase.HBaseTestingUtility;
026import org.apache.hadoop.hbase.HRegionInfo;
027import org.apache.hadoop.hbase.ServerName;
028import org.apache.hadoop.hbase.TableName;
029import org.apache.hadoop.hbase.Waiter.ExplainingPredicate;
030import org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer;
031import org.apache.hadoop.hbase.testclassification.ClientTests;
032import org.apache.hadoop.hbase.testclassification.MediumTests;
033import org.apache.hadoop.hbase.util.Bytes;
034import org.junit.AfterClass;
035import org.junit.BeforeClass;
036import org.junit.ClassRule;
037import org.junit.Test;
038import org.junit.experimental.categories.Category;
039
040@Category({ MediumTests.class, ClientTests.class })
041public class TestAsyncMetaRegionLocator {
042
043  @ClassRule
044  public static final HBaseClassTestRule CLASS_RULE =
045      HBaseClassTestRule.forClass(TestAsyncMetaRegionLocator.class);
046
047  private static final HBaseTestingUtility TEST_UTIL = new HBaseTestingUtility();
048
049  private static AsyncRegistry REGISTRY;
050
051  private static AsyncMetaRegionLocator LOCATOR;
052
053  @BeforeClass
054  public static void setUp() throws Exception {
055    TEST_UTIL.getConfiguration().set(BaseLoadBalancer.TABLES_ON_MASTER, "none");
056    TEST_UTIL.startMiniCluster(3);
057    TEST_UTIL.waitUntilAllSystemRegionsAssigned();
058    TEST_UTIL.getAdmin().setBalancerRunning(false, true);
059    REGISTRY = AsyncRegistryFactory.getRegistry(TEST_UTIL.getConfiguration());
060    LOCATOR = new AsyncMetaRegionLocator(REGISTRY);
061  }
062
063  @AfterClass
064  public static void tearDown() throws Exception {
065    IOUtils.closeQuietly(REGISTRY);
066    TEST_UTIL.shutdownMiniCluster();
067  }
068
069  private Optional<ServerName> getRSCarryingMeta() {
070    return TEST_UTIL.getHBaseCluster().getRegionServerThreads().stream()
071        .map(t -> t.getRegionServer())
072        .filter(rs -> !rs.getRegions(TableName.META_TABLE_NAME).isEmpty()).findAny()
073        .map(rs -> rs.getServerName());
074  }
075
076  @Test
077  public void testReload() throws Exception {
078    ServerName serverName = getRSCarryingMeta().get();
079    assertEquals(serverName, LOCATOR.getRegionLocation(false).get().getServerName());
080
081    ServerName newServerName = TEST_UTIL.getHBaseCluster().getRegionServerThreads().stream()
082        .map(t -> t.getRegionServer().getServerName()).filter(sn -> !sn.equals(serverName))
083        .findAny().get();
084    TEST_UTIL.getAdmin().move(HRegionInfo.FIRST_META_REGIONINFO.getEncodedNameAsBytes(),
085      Bytes.toBytes(newServerName.getServerName()));
086    TEST_UTIL.waitFor(30000, new ExplainingPredicate<Exception>() {
087
088      @Override
089      public boolean evaluate() throws Exception {
090        Optional<ServerName> newServerName = getRSCarryingMeta();
091        return newServerName.isPresent() && !newServerName.get().equals(serverName);
092      }
093
094      @Override
095      public String explainFailure() throws Exception {
096        return HRegionInfo.FIRST_META_REGIONINFO.getRegionNameAsString() + " is still on " +
097            serverName;
098      }
099    });
100    // The cached location will not change
101    assertEquals(serverName, LOCATOR.getRegionLocation(false).get().getServerName());
102    // should get the new location when reload = true
103    assertEquals(newServerName, LOCATOR.getRegionLocation(true).get().getServerName());
104    // the cached location should be replaced
105    assertEquals(newServerName, LOCATOR.getRegionLocation(false).get().getServerName());
106  }
107}