/**
* Copyright 2012 - CommonCrawl Foundation
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
**/
package org.commoncrawl.mapred.ec2.postprocess.deduper;
import java.io.IOException;
import java.util.Iterator;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.OutputCollector;
import org.apache.hadoop.mapred.Reducer;
import org.apache.hadoop.mapred.Reporter;
import org.commoncrawl.mapred.ec2.postprocess.deduper.DeduperUtils.SetUnionFinder;
import org.commoncrawl.util.CCStringUtils;
import org.commoncrawl.util.TextBytes;
/**
*
* @author rana
*
*/
public class Stage2Reducer implements Reducer<TextBytes,TextBytes,TextBytes,TextBytes> {
static final Log LOG = LogFactory.getLog(Stage2Reducer.class);
SetUnionFinder unionFinder = new SetUnionFinder();
@Override
public void reduce(TextBytes key, Iterator<TextBytes> values,OutputCollector<TextBytes, TextBytes> output, Reporter reporter)throws IOException {
try {
unionFinder.union(values);
unionFinder.emit(key, output, reporter);
}
catch (IOException e) {
LOG.error(CCStringUtils.stringifyException(e));
reporter.incrCounter("", "exceptions", 1);
}
}
@Override
public void configure(JobConf job) {
}
@Override
public void close() throws IOException {
}
}