co.nubetech.hiho.merge.MergeKeyMapper.java Source code

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Here is the source code for co.nubetech.hiho.merge.MergeKeyMapper.java

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/**
 * 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);
    }

}