Package co.nubetech.hiho.merge

Source Code of co.nubetech.hiho.merge.MergeKeyMapper

/**
* Copyright 2011 Nube Technologies
*
* Licensed 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 co.nubetech.hiho.merge;

import java.io.IOException;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.mapreduce.InputSplit;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.lib.input.FileSplit;
import org.apache.log4j.Logger;

import co.nubetech.hiho.common.HIHOConf;
import co.nubetech.hiho.dedup.HihoTuple;

public class MergeKeyMapper<K extends Writable, V extends Writable> extends
    Mapper<K, V, HihoTuple<K>, HihoValue<V>> {

  final static Logger logger = Logger
      .getLogger(co.nubetech.hiho.dedup.DedupKeyMapper.class);
  protected Boolean isOld;

  @Override
  protected void setup(Mapper.Context context) throws IOException,
      InterruptedException {

    Configuration conf = context.getConfiguration();
    InputSplit is = context.getInputSplit();
    FileSplit fs = (FileSplit) is;
    Path splitPath = fs.getPath();

    if (splitPath.toString().contains(conf.get(HIHOConf.MERGE_OLD_PATH))) {
      isOld = true;
    } else if (splitPath.toString().contains(
        conf.get(HIHOConf.MERGE_NEW_PATH))) {
      isOld = false;
    } else {
      throw new IOException("File " + splitPath
          + " is not under new path"
          + conf.get(HIHOConf.MERGE_NEW_PATH) + " and old path"
          + conf.get(HIHOConf.MERGE_OLD_PATH));
    }
  }

  @Override
  public void map(K key, V val, Context context) throws IOException,
      InterruptedException {
    if (key == null) {
      context.getCounter(MergeRecordCounter.BAD_RECORD).increment(1l);
      throw new IOException("Key is null");
    }
    if (isOld) {
      context.getCounter(MergeRecordCounter.TOTAL_RECORDS_OLD).increment(
          1l);
    } else {
      context.getCounter(MergeRecordCounter.TOTAL_RECORDS_NEW).increment(
          1l);
    }
    HihoValue<V> hihoValue = new HihoValue<V>();
    hihoValue.setVal(val);
    hihoValue.setIsOld(isOld);
    HihoTuple<K> hihoTuple = new HihoTuple<K>();
    hihoTuple.setKey(key);
    context.write(hihoTuple, hihoValue);
  }

}
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