src/main/java/org/apache/hadoop/chukwa/extraction/archive/ChukwaArchiveDataTypePartitioner.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
 * limitations under the License.
 */

package org.apache.hadoop.chukwa.extraction.archive;


import java.text.SimpleDateFormat;
import org.apache.hadoop.chukwa.ChukwaArchiveKey;
import org.apache.hadoop.chukwa.ChunkImpl;
import org.apache.hadoop.chukwa.extraction.engine.RecordUtil;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.Partitioner;

public class ChukwaArchiveDataTypePartitioner<K, V> implements
    Partitioner<ChukwaArchiveKey, ChunkImpl> {
  SimpleDateFormat sdf = new SimpleDateFormat("yyyy_MM_dd");

  boolean useClusterID = false;
  public void configure(JobConf conf) {
    useClusterID = "true".equals(conf.get(ChukwaArchiveDataTypeOutputFormat.
        GROUP_BY_CLUSTER_OPTION_NAME));
  }

  public int getPartition(ChukwaArchiveKey key, ChunkImpl chunk,
      int numReduceTasks) {
    
    if(useClusterID) {
      String clusterID = RecordUtil.getClusterName(chunk);
      return ((chunk.getDataType() + "_" + clusterID + "_" + sdf.format(key.getTimePartition()))
          .hashCode() & Integer.MAX_VALUE)
          % numReduceTasks;
    } else {
      return ((chunk.getDataType() + "_" + sdf.format(key.getTimePartition()))
        .hashCode() & Integer.MAX_VALUE)
        % numReduceTasks;
    }
  }

}