/**
* 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 MergeValueMapper<K extends Writable, V extends Writable> extends
Mapper<K, V, HihoTuple<V>, HihoValue<K>> {
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<K> hihoValue = new HihoValue<K>();
hihoValue.setVal(key);
hihoValue.setIsOld(isOld);
HihoTuple<V> hihoTuple = new HihoTuple<V>();
hihoTuple.setKey(val);
context.write(hihoTuple, hihoValue);
}
}