src/main/java/org/apache/hadoop/chukwa/extraction/archive/ChukwaArchiveBuilder.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.io.IOException;
import java.util.Iterator;
import org.apache.hadoop.chukwa.ChukwaArchiveKey;
import org.apache.hadoop.chukwa.ChunkImpl;
import org.apache.hadoop.chukwa.conf.ChukwaConfiguration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.mapred.FileInputFormat;
import org.apache.hadoop.mapred.FileOutputFormat;
import org.apache.hadoop.mapred.JobClient;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.MapReduceBase;
import org.apache.hadoop.mapred.OutputCollector;
import org.apache.hadoop.mapred.Reducer;
import org.apache.hadoop.mapred.Reporter;
import org.apache.hadoop.mapred.SequenceFileInputFormat;
import org.apache.hadoop.mapred.lib.IdentityMapper;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
import org.apache.log4j.Logger;

/**
 * Main class for mapreduce job to do archiving of Chunks.
 * 
 * Map class and reduce classes are both identity; actual logic is in 
 * Partitioner and OutputFormat classes.  Those are selected by first argument.
 * 
 * 
 *
 */
public class ChukwaArchiveBuilder extends Configured implements Tool {
  
  
  static class UniqueKeyReduce extends MapReduceBase implements
  Reducer<ChukwaArchiveKey, ChunkImpl, ChukwaArchiveKey, ChunkImpl> {

    /**
     * Outputs exactly one value for each key; this suppresses duplicates
     */
    @Override
    public void reduce(ChukwaArchiveKey key, Iterator<ChunkImpl> vals,
        OutputCollector<ChukwaArchiveKey, ChunkImpl> out, Reporter r)
        throws IOException {
      ChunkImpl i = vals.next();
      out.collect(key, i);
      int dups = 0;
      while(vals.hasNext()) {
        vals.next();
        dups ++;
      }
      r.incrCounter("app", "duplicate chunks", dups);
    }
  
  }
  static Logger log = Logger.getLogger(ChukwaArchiveBuilder.class);

  static int printUsage() {
    System.out
        .println("ChukwaArchiveBuilder <Stream/DataType/Daily/Hourly> <input> <output>");
    ToolRunner.printGenericCommandUsage(System.out);
    return -1;
  }

  public int run(String[] args) throws Exception {

    // Make sure there are exactly 3 parameters left.
    if (args.length != 3) {
      System.out.println("ERROR: Wrong number of parameters: " + args.length
          + " instead of 3.");
      return printUsage();
    }
    JobConf jobConf = new JobConf(getConf(), ChukwaArchiveBuilder.class);

    jobConf.setInputFormat(SequenceFileInputFormat.class);

    jobConf.setMapperClass(IdentityMapper.class);
    
    jobConf.setReducerClass(UniqueKeyReduce.class);
//    jobConf.setReducerClass(IdentityReducer.class);

    if (args[0].equalsIgnoreCase("Daily")) {
      jobConf.setPartitionerClass(ChukwaArchiveDailyPartitioner.class);
      jobConf.setOutputFormat(ChukwaArchiveDailyOutputFormat.class);
      jobConf.setJobName("Chukwa-DailyArchiveBuilder");
    } else if (args[0].equalsIgnoreCase("Hourly")) {
      jobConf.setJobName("Chukwa-HourlyArchiveBuilder");
      jobConf.setPartitionerClass(ChukwaArchiveHourlyPartitioner.class);
      jobConf.setOutputFormat(ChukwaArchiveHourlyOutputFormat.class);
    } else if (args[0].equalsIgnoreCase("DataType")) {
      jobConf.setJobName("Chukwa-ArchiveBuilder-DataType");
      int reduceCount = jobConf.getInt("chukwaArchiveBuilder.reduceCount", 1);
      log.info("Reduce Count:" + reduceCount);
      jobConf.setNumReduceTasks(reduceCount);

      jobConf.setPartitionerClass(ChukwaArchiveDataTypePartitioner.class);
      jobConf.setOutputFormat(ChukwaArchiveDataTypeOutputFormat.class);
    } else if (args[0].equalsIgnoreCase("Stream")) {
      jobConf.setJobName("Chukwa-HourlyArchiveBuilder-Stream");
      int reduceCount = jobConf.getInt("chukwaArchiveBuilder.reduceCount", 1);
      log.info("Reduce Count:" + reduceCount);
      jobConf.setNumReduceTasks(reduceCount);

      jobConf.setPartitionerClass(ChukwaArchiveStreamNamePartitioner.class);
      jobConf.setOutputFormat(ChukwaArchiveStreamNameOutputFormat.class);
    } else {
      System.out.println("ERROR: Wrong Time partionning: " + args[0]
          + " instead of [Stream/DataType/Hourly/Daily].");
      return printUsage();
    }

    jobConf.setOutputKeyClass(ChukwaArchiveKey.class);
    jobConf.setOutputValueClass(ChunkImpl.class);

    FileInputFormat.setInputPaths(jobConf, args[1]);
    FileOutputFormat.setOutputPath(jobConf, new Path(args[2]));

    JobClient.runJob(jobConf);
    return 0;
  }

  public static void main(String[] args) throws Exception {
    int res = ToolRunner.run(new ChukwaConfiguration(), new ChukwaArchiveBuilder(),
        args);
    return;
  }
}