branch-2.0.4-alpha/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapred/lib/TestKeyFieldBasedPartitioner.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
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 */
package org.apache.hadoop.mapred.lib;

import static org.junit.Assert.assertEquals;

import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.JobConf;
import org.junit.Test;

public class TestKeyFieldBasedPartitioner {

  /**
   * Test is key-field-based partitioned works with empty key.
   */
  @Test
  public void testEmptyKey() throws Exception {
    KeyFieldBasedPartitioner<Text, Text> kfbp = 
      new KeyFieldBasedPartitioner<Text, Text>();
    JobConf conf = new JobConf();
    conf.setInt("num.key.fields.for.partition", 10);
    kfbp.configure(conf);
    assertEquals("Empty key should map to 0th partition", 
                 0, kfbp.getPartition(new Text(), new Text(), 10));
  }

  @Test
  public void testMultiConfigure() {
    KeyFieldBasedPartitioner<Text, Text> kfbp =
      new KeyFieldBasedPartitioner<Text, Text>();
    JobConf conf = new JobConf();
    conf.set(KeyFieldBasedPartitioner.PARTITIONER_OPTIONS, "-k1,1");
    kfbp.setConf(conf);
    Text key = new Text("foo\tbar");
    Text val = new Text("val");
    int partNum = kfbp.getPartition(key, val, 4096);
    kfbp.configure(conf);
    assertEquals(partNum, kfbp.getPartition(key,val, 4096));
  }
}