core/src/main/java/org/apache/hadoop/chukwa/extraction/demux/processor/reducer/JobLogHistoryReduceProcessor.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.demux.processor.reducer;


import java.io.IOException;
import java.util.Iterator;
import org.apache.hadoop.chukwa.extraction.engine.ChukwaRecord;
import org.apache.hadoop.chukwa.extraction.engine.ChukwaRecordKey;
import org.apache.hadoop.chukwa.extraction.engine.Record;
import org.apache.hadoop.mapred.OutputCollector;
import org.apache.hadoop.mapred.Reporter;
import org.apache.log4j.Logger;

public class JobLogHistoryReduceProcessor implements ReduceProcessor {
  static Logger log = Logger.getLogger(JobLogHistoryReduceProcessor.class);

  @Override
  public String getDataType() {
    return this.getClass().getName();
  }

  @Override
  public void process(ChukwaRecordKey key, Iterator<ChukwaRecord> values,
      OutputCollector<ChukwaRecordKey, ChukwaRecord> output, Reporter reporter) {
    try {
      String action = key.getKey();
      int count = 0;

      ChukwaRecord record = null;
      while (values.hasNext()) {
        record = values.next();
        if (record.containsField("START_TIME")) {
          count++;
        } else {
          count--;
        }
      }
      ChukwaRecordKey newKey = new ChukwaRecordKey();
      newKey.setKey("" + record.getTime());
      newKey.setReduceType("MSSRGraph");
      ChukwaRecord newRecord = new ChukwaRecord();
      newRecord.add(Record.tagsField, record.getValue(Record.tagsField));
      newRecord.setTime(record.getTime());
      newRecord.add("count", "" + count);
      newRecord.add("JOBID", record.getValue("JOBID"));
      if (action.indexOf("JobLogHist/Map/") >= 0) {
        newRecord.add("type", "MAP");
      } else if (action.indexOf("JobLogHist/SHUFFLE/") >= 0) {
        newRecord.add("type", "SHUFFLE");
      } else if (action.indexOf("JobLogHist/SORT/") >= 0) {
        newRecord.add("type", "SORT");
      } else if (action.indexOf("JobLogHist/REDUCE/") >= 0) {
        newRecord.add("type", "REDUCE");
      }

      output.collect(newKey, newRecord);
    } catch (IOException e) {
      log.warn("Unable to collect output in JobLogHistoryReduceProcessor ["
          + key + "]", e);
      e.printStackTrace();
    }

  }

}