in src/java/org/apache/nutch/parse/ParseOutputFormat.java [137:390]
public RecordWriter<Text, Parse> getRecordWriter(TaskAttemptContext context)
throws IOException {
Configuration conf = context.getConfiguration();
String name = getUniqueFile(context, "part");
Path dir = FileOutputFormat.getOutputPath(context);
FileSystem fs = dir.getFileSystem(context.getConfiguration());
if (conf.getBoolean("parse.filter.urls", true)) {
filters = new URLFilters(conf);
exemptionFilters = new URLExemptionFilters(conf);
}
if (conf.getBoolean("parse.normalize.urls", true)) {
normalizers = new URLNormalizers(conf, URLNormalizers.SCOPE_OUTLINK);
}
this.scfilters = new ScoringFilters(conf);
final int interval = conf.getInt("db.fetch.interval.default", 2592000);
final boolean ignoreInternalLinks = conf.getBoolean(
"db.ignore.internal.links", false);
final boolean ignoreExternalLinks = conf.getBoolean(
"db.ignore.external.links", false);
final String ignoreExternalLinksMode = conf.get(
"db.ignore.external.links.mode", "byHost");
// NUTCH-2435 - parameter "parser.store.text" allowing to choose whether to
// store 'parse_text' directory or not:
final boolean storeText = conf.getBoolean("parser.store.text", true);
int maxOutlinksPerPage = conf.getInt("db.max.outlinks.per.page", 100);
final int maxOutlinks = (maxOutlinksPerPage < 0) ? Integer.MAX_VALUE
: maxOutlinksPerPage;
int maxOutlinkL = conf.getInt("db.max.outlink.length", 4096);
final int maxOutlinkLength = (maxOutlinkL < 0) ? Integer.MAX_VALUE
: maxOutlinkL;
final boolean isParsing = conf.getBoolean("fetcher.parse", true);
final CompressionType compType = SequenceFileOutputFormat
.getOutputCompressionType(context);
Path out = FileOutputFormat.getOutputPath(context);
Path text = new Path(new Path(out, ParseText.DIR_NAME), name);
Path data = new Path(new Path(out, ParseData.DIR_NAME), name);
Path crawl = new Path(new Path(out, CrawlDatum.PARSE_DIR_NAME), name);
final String[] parseMDtoCrawlDB = conf.get("db.parsemeta.to.crawldb", "")
.split(" *, *");
// textOut Options
final MapFile.Writer textOut;
if (storeText) {
Option tKeyClassOpt = (Option) MapFile.Writer.keyClass(Text.class);
org.apache.hadoop.io.SequenceFile.Writer.Option tValClassOpt = SequenceFile.Writer
.valueClass(ParseText.class);
org.apache.hadoop.io.SequenceFile.Writer.Option tProgressOpt = SequenceFile.Writer
.progressable((Progressable)context);
org.apache.hadoop.io.SequenceFile.Writer.Option tCompOpt = SequenceFile.Writer
.compression(CompressionType.RECORD);
textOut = new MapFile.Writer(conf, text, tKeyClassOpt, tValClassOpt,
tCompOpt, tProgressOpt);
} else {
textOut = null;
}
// dataOut Options
Option dKeyClassOpt = (Option) MapFile.Writer.keyClass(Text.class);
org.apache.hadoop.io.SequenceFile.Writer.Option dValClassOpt = SequenceFile.Writer.valueClass(ParseData.class);
org.apache.hadoop.io.SequenceFile.Writer.Option dProgressOpt = SequenceFile.Writer.progressable((Progressable)context);
org.apache.hadoop.io.SequenceFile.Writer.Option dCompOpt = SequenceFile.Writer.compression(compType);
final MapFile.Writer dataOut = new MapFile.Writer(conf, data,
dKeyClassOpt, dValClassOpt, dCompOpt, dProgressOpt);
final SequenceFile.Writer crawlOut = SequenceFile.createWriter(conf, SequenceFile.Writer.file(crawl),
SequenceFile.Writer.keyClass(Text.class),
SequenceFile.Writer.valueClass(CrawlDatum.class),
SequenceFile.Writer.bufferSize(fs.getConf().getInt("io.file.buffer.size",4096)),
SequenceFile.Writer.replication(fs.getDefaultReplication(crawl)),
SequenceFile.Writer.blockSize(1073741824),
SequenceFile.Writer.compression(compType, new DefaultCodec()),
SequenceFile.Writer.progressable((Progressable)context),
SequenceFile.Writer.metadata(new Metadata()));
return new RecordWriter<Text, Parse>() {
@Override
public void write(Text key, Parse parse) throws IOException {
String fromUrl = key.toString();
// host or domain name of the source URL
String origin = null;
if (textOut != null) {
textOut.append(key, new ParseText(parse.getText()));
}
ParseData parseData = parse.getData();
// recover the signature prepared by Fetcher or ParseSegment
String sig = parseData.getContentMeta().get(Nutch.SIGNATURE_KEY);
if (sig != null) {
byte[] signature = StringUtil.fromHexString(sig);
if (signature != null) {
// append a CrawlDatum with a signature
CrawlDatum d = new CrawlDatum(CrawlDatum.STATUS_SIGNATURE, 0);
d.setSignature(signature);
crawlOut.append(key, d);
}
}
// see if the parse metadata contain things that we'd like
// to pass to the metadata of the crawlDB entry
CrawlDatum parseMDCrawlDatum = null;
for (String mdname : parseMDtoCrawlDB) {
String mdvalue = parse.getData().getParseMeta().get(mdname);
if (mdvalue != null) {
if (parseMDCrawlDatum == null)
parseMDCrawlDatum = new CrawlDatum(CrawlDatum.STATUS_PARSE_META,
0);
parseMDCrawlDatum.getMetaData().put(new Text(mdname),
new Text(mdvalue));
}
}
if (parseMDCrawlDatum != null)
crawlOut.append(key, parseMDCrawlDatum);
// need to determine origin (once for all outlinks)
if (ignoreExternalLinks || ignoreInternalLinks) {
URL originURL = new URL(fromUrl.toString());
// based on domain?
if ("bydomain".equalsIgnoreCase(ignoreExternalLinksMode)) {
origin = URLUtil.getDomainName(originURL).toLowerCase();
}
// use host
else {
origin = originURL.getHost().toLowerCase();
}
}
ParseStatus pstatus = parseData.getStatus();
if (pstatus != null && pstatus.isSuccess()
&& pstatus.getMinorCode() == ParseStatus.SUCCESS_REDIRECT) {
String newUrl = pstatus.getMessage();
int refreshTime = Integer.parseInt(pstatus.getArgs()[1]);
newUrl = filterNormalize(fromUrl, newUrl, origin,
ignoreInternalLinks, ignoreExternalLinks, ignoreExternalLinksMode, filters, exemptionFilters, normalizers,
URLNormalizers.SCOPE_FETCHER);
if (newUrl != null) {
String reprUrl = URLUtil.chooseRepr(fromUrl, newUrl,
refreshTime < Fetcher.PERM_REFRESH_TIME);
CrawlDatum newDatum = new CrawlDatum();
newDatum.setStatus(CrawlDatum.STATUS_LINKED);
if (reprUrl != null && !reprUrl.equals(newUrl)) {
newDatum.getMetaData().put(Nutch.WRITABLE_REPR_URL_KEY,
new Text(reprUrl));
}
crawlOut.append(new Text(newUrl), newDatum);
}
}
// collect outlinks for subsequent db update
Outlink[] links = parseData.getOutlinks();
int outlinksToStore = Math.min(maxOutlinks, links.length);
int validCount = 0;
CrawlDatum adjust = null;
List<Entry<Text, CrawlDatum>> targets = new ArrayList<>(
outlinksToStore);
List<Outlink> outlinkList = new ArrayList<>(outlinksToStore);
for (int i = 0; i < links.length && validCount < outlinksToStore; i++) {
String toUrl = links[i].getToUrl();
// only normalize and filter if fetcher.parse = false
if (!isParsing) {
if (toUrl.length() > maxOutlinkLength) {
continue;
}
toUrl = ParseOutputFormat.filterNormalize(fromUrl, toUrl, origin,
ignoreInternalLinks, ignoreExternalLinks, ignoreExternalLinksMode, filters, exemptionFilters, normalizers);
if (toUrl == null) {
continue;
}
}
CrawlDatum target = new CrawlDatum(CrawlDatum.STATUS_LINKED, interval);
Text targetUrl = new Text(toUrl);
// see if the outlink has any metadata attached
// and if so pass that to the crawldatum so that
// the initial score or distribution can use that
MapWritable outlinkMD = links[i].getMetadata();
if (outlinkMD != null) {
target.getMetaData().putAll(outlinkMD);
}
try {
scfilters.initialScore(targetUrl, target);
} catch (ScoringFilterException e) {
LOG.warn("Cannot filter init score for url " + key
+ ", using default: " + e.getMessage());
target.setScore(0.0f);
}
targets.add(new SimpleEntry(targetUrl, target));
// overwrite URL in Outlink object with normalized URL (NUTCH-1174)
links[i].setUrl(toUrl);
outlinkList.add(links[i]);
validCount++;
}
try {
// compute score contributions and adjustment to the original score
adjust = scfilters.distributeScoreToOutlinks(key, parseData, targets,
null, links.length);
} catch (ScoringFilterException e) {
LOG.warn("Cannot distribute score from " + key + ": "
+ e.getMessage());
}
for (Entry<Text, CrawlDatum> target : targets) {
crawlOut.append(target.getKey(), target.getValue());
}
if (adjust != null)
crawlOut.append(key, adjust);
Outlink[] filteredLinks = outlinkList.toArray(new Outlink[outlinkList
.size()]);
parseData = new ParseData(parseData.getStatus(), parseData.getTitle(),
filteredLinks, parseData.getContentMeta(), parseData.getParseMeta());
dataOut.append(key, parseData);
if (!parse.isCanonical()) {
CrawlDatum datum = new CrawlDatum();
datum.setStatus(CrawlDatum.STATUS_FETCH_SUCCESS);
String timeString = parse.getData().getContentMeta()
.get(Nutch.FETCH_TIME_KEY);
try {
datum.setFetchTime(Long.parseLong(timeString));
} catch (Exception e) {
LOG.warn("Can't read fetch time for: " + key);
datum.setFetchTime(System.currentTimeMillis());
}
crawlOut.append(key, datum);
}
}
@Override
public void close(TaskAttemptContext context) throws IOException {
if (textOut != null)
textOut.close();
dataOut.close();
crawlOut.close();
}
};
}