/**
* 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.pipelineV3.domainmeta.rank;
import java.io.IOException;
import java.util.Iterator;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.mapred.JobClient;
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.crawl.common.internal.CrawlEnvironment;
import org.commoncrawl.mapred.pipelineV3.CrawlPipelineStep;
import org.commoncrawl.mapred.pipelineV3.CrawlPipelineTask;
import org.commoncrawl.mapred.pipelineV3.domainmeta.quantcast.ImportQuantcastStep;
import org.commoncrawl.util.JobBuilder;
import org.commoncrawl.util.JoinMapper;
import org.commoncrawl.util.JoinValue;
import org.commoncrawl.util.TextBytes;
import com.google.common.collect.ImmutableList;
import com.google.gson.JsonObject;
/**
*
* @author rana
*
*/
public class JoinQuantcastAndDomainRankStep extends CrawlPipelineStep implements
Reducer<TextBytes, JoinValue, TextBytes, TextBytes> {
enum Counters {
HAD_DOMAIN_RANK, HAD_Q_RANK
}
private static final Log LOG = LogFactory.getLog(JoinQuantcastAndDomainRankStep.class);
public static final String OUTPUT_DIR_NAME = "QuantcastDomainRankJoin";
JsonObject objectOut = new JsonObject();
TextBytes rankValue = new TextBytes();
public JoinQuantcastAndDomainRankStep() {
super(null, null, null);
}
public JoinQuantcastAndDomainRankStep(CrawlPipelineTask task) {
super(task, "QuantcastDomainRankJoin", OUTPUT_DIR_NAME);
}
@Override
public void close() throws IOException {
}
@Override
public void configure(JobConf job) {
}
@Override
public Log getLogger() {
return LOG;
}
@Override
public void reduce(TextBytes key, Iterator<JoinValue> values, OutputCollector<TextBytes, TextBytes> output,
Reporter reporter) throws IOException {
double domainRank = 0.0;
int qrank = 0;
while (values.hasNext()) {
JoinValue nextValue = values.next();
if (nextValue.getTag().toString().equals(ImportQuantcastStep.OUTPUT_DIR_NAME)) {
reporter.incrCounter(Counters.HAD_Q_RANK, 1);
qrank = (int) nextValue.getLongValue();
} else if (nextValue.getTag().toString().equals(GenDomainRankStep.OUTPUT_DIR_NAME)) {
reporter.incrCounter(Counters.HAD_DOMAIN_RANK, 1);
domainRank = nextValue.getDoubleValue();
break;
}
}
objectOut.addProperty("dR", domainRank);
objectOut.addProperty("qR", qrank);
rankValue.set(objectOut.toString());
output.collect(key, rankValue);
}
@Override
public void runStep(Path outputPathLocation) throws IOException {
ImmutableList<Path> pathList = new ImmutableList.Builder<Path>()
.add(getOutputDirForStep(ImportQuantcastStep.class)).add(getOutputDirForStep(GenDomainRankStep.class)).build();
JobConf job = new JobBuilder(getDescription(), getConf())
.inputs(pathList).inputIsSeqFile().mapper(JoinMapper.class).mapperKeyValue(TextBytes.class, JoinValue.class)
.reducer(JoinQuantcastAndDomainRankStep.class, false).numReducers(CrawlEnvironment.NUM_DB_SHARDS / 2)
.outputKeyValue(TextBytes.class, TextBytes.class).outputIsSeqFile().output(outputPathLocation)
.build();
JobClient.runJob(job);
}
}