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IndexerMapper.java
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Sat, Oct 5, 10:15

IndexerMapper.java
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/*
* Warcbase: an open-source platform for managing web archives
*
* 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 org.warcbase.index;
import java.io.IOException;
import java.security.NoSuchAlgorithmException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.MapReduceBase;
import org.apache.hadoop.mapred.Mapper;
import org.apache.hadoop.mapred.OutputCollector;
import org.apache.hadoop.mapred.Reporter;
import org.archive.io.ArchiveRecord;
import org.archive.io.ArchiveRecordHeader;
import uk.bl.wa.hadoop.WritableArchiveRecord;
import uk.bl.wa.hadoop.indexer.WritableSolrRecord;
import uk.bl.wa.indexer.WARCIndexer;
import uk.bl.wa.solr.SolrRecord;
import com.typesafe.config.Config;
import com.typesafe.config.ConfigFactory;
public class IndexerMapper extends MapReduceBase implements
Mapper<Text, WritableArchiveRecord, IntWritable, WritableSolrRecord> {
public static final String NUM_SHARDS = "IndexerMapper.NumShards";
private static final Log LOG = LogFactory.getLog(IndexerMapper.class);
static enum MyCounters {
NUM_RECORDS, NUM_ERRORS, NUM_NULLS, NUM_EMPTY_HEADERS
}
private String mapTaskId;
private String inputFile;
private int numRecords = 0;
private int numShards;
private WARCIndexer indexer;
@Override
public void configure(JobConf job) {
try {
LOG.info("Configuring WARCIndexer.");
Config config = ConfigFactory.parseString(job.get(IndexerRunner.CONFIG_PROPERTIES));
this.indexer = new WARCIndexer(config);
numShards = job.getInt(NUM_SHARDS, 10);
LOG.info("Number of shards: " + numShards);
mapTaskId = job.get("mapred.task.id");
inputFile = job.get("map.input.file");
LOG.info("Got task.id " + mapTaskId + " and input.file " + inputFile);
} catch (NoSuchAlgorithmException e) {
LOG.error("IndexerMapper.configure(): " + e.getMessage());
}
}
@Override
public void map(Text key, WritableArchiveRecord value,
OutputCollector<IntWritable, WritableSolrRecord> output, Reporter reporter)
throws IOException {
ArchiveRecordHeader header = value.getRecord().getHeader();
ArchiveRecord rec = value.getRecord();
SolrRecord solr = new SolrRecord(key.toString(), rec.getHeader());
numRecords++;
try {
if (!header.getHeaderFields().isEmpty()) {
solr = indexer.extract(key.toString(), value.getRecord());
// If there is no result, report it.
if (solr == null) {
LOG.debug("WARCIndexer returned NULL for: " + header.getUrl());
reporter.incrCounter(MyCounters.NUM_NULLS, 1);
return;
}
// Increment record counter.
reporter.incrCounter(MyCounters.NUM_RECORDS, 1);
} else {
// Report headerless records.
reporter.incrCounter(MyCounters.NUM_EMPTY_HEADERS, 1);
}
} catch (Exception e) {
LOG.error(e.getClass().getName() + ": " + e.getMessage() + "; " + header.getUrl() + "; " + header.getOffset());
reporter.incrCounter(MyCounters.NUM_ERRORS, 1);
solr.addParseException(e);
} catch (OutOfMemoryError e) {
LOG.error("OOME " + e.getClass().getName() + ": " + e.getMessage() + "; " + header.getUrl() + "; " + header.getOffset());
reporter.incrCounter(MyCounters.NUM_ERRORS, 1);
solr.addParseException(e);
}
// Random shard assignment.
IntWritable shard = new IntWritable((int) (Math.round(Math.random() * (numShards-1))));
// Wrap up and collect the result:
WritableSolrRecord solrRecord = new WritableSolrRecord(solr);
output.collect(shard, solrRecord);
// Occasionally update application-level status.
if ((numRecords % 1000) == 0) {
reporter.setStatus(numRecords + " processed from " + inputFile);
// Also assure framework that we are making progress.
reporter.progress();
}
}
}

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