/** | |
* 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 | |
* limitations under the License. | |
*/ | |
package org.apache.hadoop.contrib.index.mapred; | |
import java.util.HashMap; | |
import java.util.Map; | |
import org.apache.hadoop.mapred.JobConf; | |
import org.apache.hadoop.mapred.Partitioner; | |
/** | |
* This partitioner class puts the values of the same key - in this case the | |
* same shard - in the same partition. | |
*/ | |
public class IndexUpdatePartitioner implements | |
Partitioner<Shard, IntermediateForm> { | |
private Shard[] shards; | |
private Map<Shard, Integer> map; | |
/* (non-Javadoc) | |
* @see org.apache.hadoop.mapred.Partitioner#getPartition(java.lang.Object, java.lang.Object, int) | |
*/ | |
public int getPartition(Shard key, IntermediateForm value, int numPartitions) { | |
int partition = map.get(key).intValue(); | |
if (partition < numPartitions) { | |
return partition; | |
} else { | |
return numPartitions - 1; | |
} | |
} | |
/* (non-Javadoc) | |
* @see org.apache.hadoop.mapred.JobConfigurable#configure(org.apache.hadoop.mapred.JobConf) | |
*/ | |
public void configure(JobConf job) { | |
shards = Shard.getIndexShards(new IndexUpdateConfiguration(job)); | |
map = new HashMap<Shard, Integer>(); | |
for (int i = 0; i < shards.length; i++) { | |
map.put(shards[i], i); | |
} | |
} | |
} |