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.mapreduce;
019
020import static org.junit.Assert.assertEquals;
021
022import org.apache.hadoop.conf.Configuration;
023import org.apache.hadoop.hbase.HBaseClassTestRule;
024import org.apache.hadoop.hbase.HBaseTestingUtility;
025import org.apache.hadoop.hbase.HConstants;
026import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
027import org.apache.hadoop.hbase.testclassification.MapReduceTests;
028import org.apache.hadoop.hbase.testclassification.SmallTests;
029import org.apache.hadoop.hbase.util.Bytes;
030import org.junit.ClassRule;
031import org.junit.Test;
032import org.junit.experimental.categories.Category;
033
034/**
035 * Test of simple partitioner.
036 */
037@Category({MapReduceTests.class, SmallTests.class})
038public class TestSimpleTotalOrderPartitioner {
039
040  @ClassRule
041  public static final HBaseClassTestRule CLASS_RULE =
042      HBaseClassTestRule.forClass(TestSimpleTotalOrderPartitioner.class);
043
044  protected final static HBaseTestingUtility TEST_UTIL = new HBaseTestingUtility();
045  Configuration conf = TEST_UTIL.getConfiguration();
046
047  @Test
048  public void testSplit() throws Exception {
049    String start = "a";
050    String end = "{";
051    SimpleTotalOrderPartitioner<byte []> p = new SimpleTotalOrderPartitioner<>();
052
053    this.conf.set(SimpleTotalOrderPartitioner.START, start);
054    this.conf.set(SimpleTotalOrderPartitioner.END, end);
055    p.setConf(this.conf);
056    ImmutableBytesWritable c = new ImmutableBytesWritable(Bytes.toBytes("c"));
057    // If one reduce, partition should be 0.
058    int partition = p.getPartition(c, HConstants.EMPTY_BYTE_ARRAY, 1);
059    assertEquals(0, partition);
060    // If two reduces, partition should be 0.
061    partition = p.getPartition(c, HConstants.EMPTY_BYTE_ARRAY, 2);
062    assertEquals(0, partition);
063    // Divide in 3.
064    partition = p.getPartition(c, HConstants.EMPTY_BYTE_ARRAY, 3);
065    assertEquals(0, partition);
066    ImmutableBytesWritable q = new ImmutableBytesWritable(Bytes.toBytes("q"));
067    partition = p.getPartition(q, HConstants.EMPTY_BYTE_ARRAY, 2);
068    assertEquals(1, partition);
069    partition = p.getPartition(q, HConstants.EMPTY_BYTE_ARRAY, 3);
070    assertEquals(2, partition);
071    // What about end and start keys.
072    ImmutableBytesWritable startBytes =
073      new ImmutableBytesWritable(Bytes.toBytes(start));
074    partition = p.getPartition(startBytes, HConstants.EMPTY_BYTE_ARRAY, 2);
075    assertEquals(0, partition);
076    partition = p.getPartition(startBytes, HConstants.EMPTY_BYTE_ARRAY, 3);
077    assertEquals(0, partition);
078    ImmutableBytesWritable endBytes =
079      new ImmutableBytesWritable(Bytes.toBytes("z"));
080    partition = p.getPartition(endBytes, HConstants.EMPTY_BYTE_ARRAY, 2);
081    assertEquals(1, partition);
082    partition = p.getPartition(endBytes, HConstants.EMPTY_BYTE_ARRAY, 3);
083    assertEquals(2, partition);
084  }
085
086}
087