/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.nutch.indexer;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Iterator;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.ByteWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.FileInputFormat;
import org.apache.hadoop.mapred.JobClient;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.Mapper;
import org.apache.hadoop.mapred.OutputCollector;
import org.apache.hadoop.mapred.Reducer;
import org.apache.hadoop.mapred.Reporter;
import org.apache.hadoop.mapred.SequenceFileInputFormat;
import org.apache.hadoop.mapred.lib.NullOutputFormat;
import org.apache.hadoop.util.StringUtils;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
import org.apache.nutch.crawl.CrawlDatum;
import org.apache.nutch.crawl.CrawlDb;
import org.apache.nutch.util.NutchConfiguration;
import org.apache.nutch.util.NutchJob;
import org.apache.nutch.util.TimingUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* The class scans CrawlDB looking for entries with status DB_GONE (404) or
* DB_DUPLICATE and
* sends delete requests to indexers for those documents.
*/
public class CleaningJob implements Tool {
public static final Logger LOG = LoggerFactory.getLogger(CleaningJob.class);
private Configuration conf;
@Override
public Configuration getConf() {
return conf;
}
@Override
public void setConf(Configuration conf) {
this.conf = conf;
}
public static class DBFilter implements
Mapper<Text, CrawlDatum, ByteWritable, Text> {
private ByteWritable OUT = new ByteWritable(CrawlDatum.STATUS_DB_GONE);
@Override
public void configure(JobConf arg0) {
}
@Override
public void close() throws IOException {
}
@Override
public void map(Text key, CrawlDatum value,
OutputCollector<ByteWritable, Text> output, Reporter reporter)
throws IOException {
if (value.getStatus() == CrawlDatum.STATUS_DB_GONE || value.getStatus() == CrawlDatum.STATUS_DB_DUPLICATE) {
output.collect(OUT, key);
}
}
}
public static class DeleterReducer implements
Reducer<ByteWritable, Text, Text, ByteWritable> {
private static final int NUM_MAX_DELETE_REQUEST = 1000;
private int numDeletes = 0;
private int totalDeleted = 0;
private boolean noCommit = false;
IndexWriters writers = null;
@Override
public void configure(JobConf job) {
writers = new IndexWriters(job);
try {
writers.open(job, "Deletion");
} catch (IOException e) {
throw new RuntimeException(e);
}
noCommit = job.getBoolean("noCommit", false);
}
@Override
public void close() throws IOException {
// BUFFERING OF CALLS TO INDEXER SHOULD BE HANDLED AT INDEXER LEVEL
// if (numDeletes > 0) {
// LOG.info("CleaningJob: deleting " + numDeletes + " documents");
// // TODO updateRequest.process(solr);
// totalDeleted += numDeletes;
// }
writers.close();
if (totalDeleted > 0 && !noCommit) {
writers.commit();
}
LOG.info("CleaningJob: deleted a total of " + totalDeleted
+ " documents");
}
@Override
public void reduce(ByteWritable key, Iterator<Text> values,
OutputCollector<Text, ByteWritable> output, Reporter reporter)
throws IOException {
while (values.hasNext()) {
Text document = values.next();
writers.delete(document.toString());
totalDeleted++;
reporter.incrCounter("CleaningJobStatus", "Deleted documents",
1);
// if (numDeletes >= NUM_MAX_DELETE_REQUEST) {
// LOG.info("CleaningJob: deleting " + numDeletes
// + " documents");
// // TODO updateRequest.process(solr);
// // TODO updateRequest = new UpdateRequest();
// writers.delete(key.toString());
// totalDeleted += numDeletes;
// numDeletes = 0;
// }
}
}
}
public void delete(String crawldb, boolean noCommit) throws IOException {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
long start = System.currentTimeMillis();
LOG.info("CleaningJob: starting at " + sdf.format(start));
JobConf job = new NutchJob(getConf());
FileInputFormat.addInputPath(job, new Path(crawldb,
CrawlDb.CURRENT_NAME));
job.setBoolean("noCommit", noCommit);
job.setInputFormat(SequenceFileInputFormat.class);
job.setOutputFormat(NullOutputFormat.class);
job.setMapOutputKeyClass(ByteWritable.class);
job.setMapOutputValueClass(Text.class);
job.setMapperClass(DBFilter.class);
job.setReducerClass(DeleterReducer.class);
job.setJobName("CleaningJob");
// need to expicitely allow deletions
job.setBoolean(IndexerMapReduce.INDEXER_DELETE, true);
JobClient.runJob(job);
long end = System.currentTimeMillis();
LOG.info("CleaningJob: finished at " + sdf.format(end) + ", elapsed: "
+ TimingUtil.elapsedTime(start, end));
}
public int run(String[] args) throws IOException {
if (args.length < 1) {
String usage = "Usage: CleaningJob <crawldb> [-noCommit]";
LOG.error("Missing crawldb. "+usage);
System.err.println(usage);
IndexWriters writers = new IndexWriters(getConf());
System.err.println(writers.describe());
return 1;
}
boolean noCommit = false;
if (args.length == 2 && args[1].equals("-noCommit")) {
noCommit = true;
}
try {
delete(args[0], noCommit);
} catch (final Exception e) {
LOG.error("CleaningJob: " + StringUtils.stringifyException(e));
System.err.println("ERROR CleaningJob: "
+ StringUtils.stringifyException(e));
return -1;
}
return 0;
}
public static void main(String[] args) throws Exception {
int result = ToolRunner.run(NutchConfiguration.create(),
new CleaningJob(), args);
System.exit(result);
}
}