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;
019
020import static org.junit.Assert.assertEquals;
021import static org.junit.Assert.assertNotNull;
022
023import java.util.concurrent.TimeUnit;
024import org.apache.hadoop.hbase.Waiter.ExplainingPredicate;
025import org.apache.hadoop.hbase.client.AsyncConnection;
026import org.apache.hadoop.hbase.client.ColumnFamilyDescriptorBuilder;
027import org.apache.hadoop.hbase.client.ConnectionFactory;
028import org.apache.hadoop.hbase.client.RegionInfo;
029import org.apache.hadoop.hbase.client.TableDescriptor;
030import org.apache.hadoop.hbase.client.TableDescriptorBuilder;
031import org.apache.hadoop.hbase.testclassification.MediumTests;
032import org.apache.hadoop.hbase.testclassification.MiscTests;
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({ MiscTests.class, MediumTests.class })
041public class TestSplitMerge {
042
043  @ClassRule
044  public static final HBaseClassTestRule CLASS_RULE =
045    HBaseClassTestRule.forClass(TestSplitMerge.class);
046
047  private static final HBaseTestingUtility UTIL = new HBaseTestingUtility();
048
049  @BeforeClass
050  public static void setUp() throws Exception {
051    UTIL.getConfiguration().setInt(HConstants.HBASE_CLIENT_META_OPERATION_TIMEOUT, 1000);
052    UTIL.getConfiguration().setInt(HConstants.HBASE_CLIENT_RETRIES_NUMBER, 2);
053    UTIL.startMiniCluster(1);
054  }
055
056  @AfterClass
057  public static void tearDown() throws Exception {
058    UTIL.shutdownMiniCluster();
059  }
060
061  @Test
062  public void test() throws Exception {
063    TableName tableName = TableName.valueOf("SplitMerge");
064    byte[] family = Bytes.toBytes("CF");
065    TableDescriptor td = TableDescriptorBuilder.newBuilder(tableName)
066      .setColumnFamily(ColumnFamilyDescriptorBuilder.of(family)).build();
067    UTIL.getAdmin().createTable(td, new byte[][] { Bytes.toBytes(1) });
068    UTIL.waitTableAvailable(tableName);
069    UTIL.getAdmin().split(tableName, Bytes.toBytes(2));
070    UTIL.waitFor(30000, new ExplainingPredicate<Exception>() {
071
072      @Override
073      public boolean evaluate() throws Exception {
074        return UTIL.getMiniHBaseCluster().getRegions(tableName).size() == 3;
075      }
076
077      @Override
078      public String explainFailure() throws Exception {
079        return "Split has not finished yet";
080      }
081    });
082    RegionInfo regionA = null;
083    RegionInfo regionB = null;
084    for (RegionInfo region : UTIL.getAdmin().getRegions(tableName)) {
085      if (region.getStartKey().length == 0) {
086        regionA = region;
087      } else if (Bytes.equals(region.getStartKey(), Bytes.toBytes(1))) {
088        regionB = region;
089      }
090    }
091    assertNotNull(regionA);
092    assertNotNull(regionB);
093    UTIL.getAdmin().mergeRegionsAsync(regionA.getRegionName(), regionB.getRegionName(), false)
094      .get(30, TimeUnit.SECONDS);
095    assertEquals(2, UTIL.getAdmin().getRegions(tableName).size());
096
097    ServerName expected = UTIL.getMiniHBaseCluster().getRegionServer(0).getServerName();
098    assertEquals(expected, UTIL.getConnection().getRegionLocator(tableName)
099      .getRegionLocation(Bytes.toBytes(1), true).getServerName());
100    try (AsyncConnection asyncConn =
101      ConnectionFactory.createAsyncConnection(UTIL.getConfiguration()).get()) {
102      assertEquals(expected, asyncConn.getRegionLocator(tableName)
103        .getRegionLocation(Bytes.toBytes(1), true).get().getServerName());
104    }
105  }
106}