/**
* 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.crawl;
import java.util.*;
import java.text.*;
// Commons Logging imports
import org.apache.commons.lang.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.hadoop.fs.*;
import org.apache.hadoop.conf.*;
import org.apache.hadoop.mapred.*;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
import org.apache.nutch.parse.ParseSegment;
import org.apache.nutch.indexer.IndexingJob;
import org.apache.nutch.indexer.solr.SolrDeleteDuplicates;
import org.apache.nutch.util.HadoopFSUtil;
import org.apache.nutch.util.NutchConfiguration;
import org.apache.nutch.util.NutchJob;
import org.apache.nutch.fetcher.Fetcher;
public class Crawl extends Configured implements Tool {
public static final Logger LOG = LoggerFactory.getLogger(Crawl.class);
private static String getDate() {
return new SimpleDateFormat("yyyyMMddHHmmss").format
(new Date(System.currentTimeMillis()));
}
/* Perform complete crawling and indexing (to Solr) given a set of root urls and the -solr
parameter respectively. More information and Usage parameters can be found below. */
public static void main(String args[]) throws Exception {
Configuration conf = NutchConfiguration.create();
int res = ToolRunner.run(conf, new Crawl(), args);
System.exit(res);
}
@Override
public int run(String[] args) throws Exception {
if (args.length < 1) {
System.out.println
("Usage: Crawl <urlDir> -solr <solrURL> [-dir d] [-threads n] [-depth i] [-topN N]");
return -1;
}
Path rootUrlDir = null;
Path dir = new Path("crawl-" + getDate());
int threads = getConf().getInt("fetcher.threads.fetch", 10);
int depth = 5;
long topN = Long.MAX_VALUE;
String solrUrl = null;
for (int i = 0; i < args.length; i++) {
if ("-dir".equals(args[i])) {
dir = new Path(args[i+1]);
i++;
} else if ("-threads".equals(args[i])) {
threads = Integer.parseInt(args[i+1]);
i++;
} else if ("-depth".equals(args[i])) {
depth = Integer.parseInt(args[i+1]);
i++;
} else if ("-topN".equals(args[i])) {
topN = Integer.parseInt(args[i+1]);
i++;
} else if ("-solr".equals(args[i])) {
solrUrl = args[i + 1];
i++;
} else if (args[i] != null) {
rootUrlDir = new Path(args[i]);
}
}
JobConf job = new NutchJob(getConf());
if (solrUrl == null) {
LOG.warn("solrUrl is not set, indexing will be skipped...");
}
else {
// for simplicity assume that SOLR is used
// and pass its URL via conf
getConf().set("solr.server.url", solrUrl);
}
FileSystem fs = FileSystem.get(job);
if (LOG.isInfoEnabled()) {
LOG.info("crawl started in: " + dir);
LOG.info("rootUrlDir = " + rootUrlDir);
LOG.info("threads = " + threads);
LOG.info("depth = " + depth);
LOG.info("solrUrl=" + solrUrl);
if (topN != Long.MAX_VALUE)
LOG.info("topN = " + topN);
}
Path crawlDb = new Path(dir + "/crawldb");
Path linkDb = new Path(dir + "/linkdb");
Path segments = new Path(dir + "/segments");
Path indexes = new Path(dir + "/indexes");
Path index = new Path(dir + "/index");
Path tmpDir = job.getLocalPath("crawl"+Path.SEPARATOR+getDate());
Injector injector = new Injector(getConf());
Generator generator = new Generator(getConf());
Fetcher fetcher = new Fetcher(getConf());
ParseSegment parseSegment = new ParseSegment(getConf());
CrawlDb crawlDbTool = new CrawlDb(getConf());
LinkDb linkDbTool = new LinkDb(getConf());
// initialize crawlDb
injector.inject(crawlDb, rootUrlDir);
int i;
for (i = 0; i < depth; i++) { // generate new segment
Path[] segs = generator.generate(crawlDb, segments, -1, topN, System
.currentTimeMillis());
if (segs == null) {
LOG.info("Stopping at depth=" + i + " - no more URLs to fetch.");
break;
}
fetcher.fetch(segs[0], threads); // fetch it
if (!Fetcher.isParsing(job)) {
parseSegment.parse(segs[0]); // parse it, if needed
}
crawlDbTool.update(crawlDb, segs, true, true); // update crawldb
}
if (i > 0) {
linkDbTool.invert(linkDb, segments, true, true, false); // invert links
if (solrUrl != null) {
// index, dedup & merge
FileStatus[] fstats = fs.listStatus(segments, HadoopFSUtil.getPassDirectoriesFilter(fs));
IndexingJob indexer = new IndexingJob(getConf());
indexer.index(crawlDb, linkDb,
Arrays.asList(HadoopFSUtil.getPaths(fstats)));
SolrDeleteDuplicates dedup = new SolrDeleteDuplicates();
dedup.setConf(getConf());
dedup.dedup(solrUrl);
}
} else {
LOG.warn("No URLs to fetch - check your seed list and URL filters.");
}
if (LOG.isInfoEnabled()) { LOG.info("crawl finished: " + dir); }
return 0;
}
}