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