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547 lines
24 KiB
547 lines
24 KiB
// Segment.java
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// (C) 2005-2009 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
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// first published 2005 on http://yacy.net; full redesign for segments 28.5.2009
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//
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// This is a part of YaCy, a peer-to-peer based web search engine
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//
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// $LastChangedDate$
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// $LastChangedRevision$
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// $LastChangedBy$
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//
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// LICENSE
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package net.yacy.search.index;
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import java.io.File;
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import java.io.IOException;
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import java.util.Date;
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import java.util.Iterator;
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import java.util.Map;
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import java.util.Properties;
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import java.util.Set;
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import java.util.concurrent.BlockingQueue;
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import org.apache.solr.common.SolrInputDocument;
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import net.yacy.cora.document.ASCII;
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import net.yacy.cora.document.MultiProtocolURI;
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import net.yacy.cora.document.UTF8;
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import net.yacy.cora.federate.solr.YaCySchema;
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import net.yacy.cora.federate.solr.connector.AbstractSolrConnector;
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import net.yacy.cora.federate.yacy.CacheStrategy;
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import net.yacy.cora.order.Base64Order;
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import net.yacy.cora.order.ByteOrder;
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import net.yacy.cora.protocol.ResponseHeader;
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import net.yacy.cora.storage.HandleSet;
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import net.yacy.cora.util.LookAheadIterator;
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import net.yacy.cora.util.SpaceExceededException;
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import net.yacy.crawler.data.CrawlProfile;
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import net.yacy.crawler.data.CrawlQueues;
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import net.yacy.crawler.retrieval.Response;
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import net.yacy.document.Condenser;
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import net.yacy.document.Document;
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import net.yacy.document.Parser;
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import net.yacy.kelondro.data.citation.CitationReference;
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import net.yacy.kelondro.data.citation.CitationReferenceFactory;
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import net.yacy.kelondro.data.meta.DigestURI;
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import net.yacy.kelondro.data.word.Word;
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import net.yacy.kelondro.data.word.WordReference;
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import net.yacy.kelondro.data.word.WordReferenceFactory;
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import net.yacy.kelondro.data.word.WordReferenceRow;
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import net.yacy.kelondro.logging.Log;
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import net.yacy.kelondro.rwi.IndexCell;
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import net.yacy.kelondro.rwi.ReferenceContainer;
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import net.yacy.kelondro.rwi.ReferenceFactory;
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import net.yacy.kelondro.util.Bitfield;
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import net.yacy.kelondro.util.ISO639;
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import net.yacy.repository.LoaderDispatcher;
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import net.yacy.search.Switchboard;
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import net.yacy.search.SwitchboardConstants;
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import net.yacy.search.query.RankingProcess;
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import net.yacy.search.query.SearchEvent;
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public class Segment {
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// catchall word
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public final static String catchallString = "yacyall"; // a word that is always in all indexes; can be used for zero-word searches to find ALL documents
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public final static byte[] catchallHash;
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final static Word catchallWord = new Word(0, 0, 0);
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static {
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catchallHash = Word.word2hash(catchallString); // "KZzU-Vf6h5k-"
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catchallWord.flags = new Bitfield(4);
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for (int i = 0; i < catchallWord.flags.length(); i++) catchallWord.flags.set(i, true);
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}
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// environment constants
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public static final long wCacheMaxAge = 1000 * 60 * 30; // milliseconds; 30 minutes
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public static final int wCacheMaxChunk = 800; // maximum number of references for each urlhash
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public static final int lowcachedivisor = 900;
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public static final long targetFileSize = 64 * 1024 * 1024; // 256 MB
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public static final int writeBufferSize = 4 * 1024 * 1024;
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public static final String UrlDbName = "text.urlmd";
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public static final String termIndexName = "text.index";
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public static final String citationIndexName = "citation.index";
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// the reference factory
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public static final ReferenceFactory<WordReference> wordReferenceFactory = new WordReferenceFactory();
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public static final ReferenceFactory<CitationReference> citationReferenceFactory = new CitationReferenceFactory();
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public static final ByteOrder wordOrder = Base64Order.enhancedCoder;
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private final Log log;
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private final File segmentPath;
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protected final Fulltext fulltext;
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protected IndexCell<WordReference> termIndex;
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protected IndexCell<CitationReference> urlCitationIndex;
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public Segment(final Log log, final File segmentPath, final SolrConfiguration solrScheme) {
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log.logInfo("Initializing Segment '" + segmentPath + ".");
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this.log = log;
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this.segmentPath = segmentPath;
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// create LURL-db
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this.fulltext = new Fulltext(segmentPath, solrScheme);
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}
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public boolean connectedRWI() {
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return this.termIndex != null;
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}
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public void connectRWI(final int entityCacheMaxSize, final long maxFileSize) throws IOException {
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if (this.termIndex != null) return;
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this.termIndex = new IndexCell<WordReference>(
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this.segmentPath,
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termIndexName,
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wordReferenceFactory,
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wordOrder,
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Word.commonHashLength,
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entityCacheMaxSize,
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targetFileSize,
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maxFileSize,
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writeBufferSize);
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}
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public void disconnectRWI() {
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if (this.termIndex == null) return;
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this.termIndex.close();
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this.termIndex = null;
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}
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public boolean connectedCitation() {
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return this.urlCitationIndex != null;
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}
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public void connectCitation(final int entityCacheMaxSize, final long maxFileSize) throws IOException {
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if (this.urlCitationIndex != null) return;
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this.urlCitationIndex = new IndexCell<CitationReference>(
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this.segmentPath,
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citationIndexName,
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citationReferenceFactory,
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wordOrder,
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Word.commonHashLength,
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entityCacheMaxSize,
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targetFileSize,
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maxFileSize,
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writeBufferSize);
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}
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public void disconnectCitation() {
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if (this.urlCitationIndex == null) return;
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this.urlCitationIndex.close();
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this.urlCitationIndex = null;
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}
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public void connectUrlDb(final boolean useTailCache, final boolean exceed134217727) {
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this.fulltext.connectUrlDb(UrlDbName, useTailCache, exceed134217727);
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}
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public Fulltext fulltext() {
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return this.fulltext;
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}
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public IndexCell<WordReference> termIndex() {
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return this.termIndex;
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}
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public IndexCell<CitationReference> urlCitation() {
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return this.urlCitationIndex;
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}
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public long URLCount() {
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return this.fulltext.size();
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}
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public long RWICount() {
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if (this.termIndex == null) return 0;
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return this.termIndex.sizesMax();
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}
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public int RWIBufferCount() {
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if (this.termIndex == null) return 0;
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return this.termIndex.getBufferSize();
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}
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public int getQueryCount(StringBuilder wordsb) {
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return getQueryCount(wordsb.toString());
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}
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public int getQueryCount(String word) {
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if (word == null || word.indexOf(':') >= 0 || word.indexOf(' ') >= 0 || word.indexOf('/') >= 0) return 0;
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int count = this.termIndex == null ? 0 : this.termIndex.count(Word.word2hash(word));
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try {count += this.fulltext.getSolr().getQueryCount(YaCySchema.text_t.getSolrFieldName() + ':' + word);} catch (IOException e) {}
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return count;
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}
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public boolean exists(final byte[] urlhash) {
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return this.fulltext.exists(urlhash);
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}
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/**
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* discover all urls that start with a given url stub
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* @param stub
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* @return an iterator for all matching urls
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*/
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public Iterator<DigestURI> urlSelector(MultiProtocolURI stub) {
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final String host = stub.getHost();
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String hh = DigestURI.hosthash(host);
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final BlockingQueue<String> hostQueue = this.fulltext.getSolr().concurrentIDs(YaCySchema.host_id_s + ":" + hh, 0, Integer.MAX_VALUE, 10000);
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final String urlstub = stub.toNormalform(true);
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// now filter the stub from the iterated urls
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return new LookAheadIterator<DigestURI>() {
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@Override
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protected DigestURI next0() {
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while (true) {
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String id;
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try {
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id = hostQueue.take();
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} catch (InterruptedException e) {
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Log.logException(e);
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return null;
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}
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if (id == null || id == AbstractSolrConnector.POISON_ID) return null;
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DigestURI u = Segment.this.fulltext.getURL(ASCII.getBytes(id));
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if (u.toNormalform(true).startsWith(urlstub)) return u;
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}
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}
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};
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}
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public void clear() {
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try {
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if (this.termIndex != null) this.termIndex.clear();
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if (this.fulltext != null) this.fulltext.clearURLIndex();
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if (this.fulltext != null) this.fulltext.clearLocalSolr();
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if (this.fulltext != null) this.fulltext.clearRemoteSolr();
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if (this.urlCitationIndex != null) this.urlCitationIndex.clear();
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} catch (final IOException e) {
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Log.logException(e);
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}
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}
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public File getLocation() {
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return this.segmentPath;
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}
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private int addCitationIndex(final DigestURI url, final Date urlModified, final Map<MultiProtocolURI, Properties> anchors) {
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if (anchors == null) return 0;
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int refCount = 0;
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// iterate over all outgoing links, this will create a context for those links
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final byte[] urlhash = url.hash();
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final long urldate = urlModified.getTime();
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for (Map.Entry<MultiProtocolURI, Properties> anchorEntry: anchors.entrySet()) {
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MultiProtocolURI anchor = anchorEntry.getKey();
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byte[] refhash = DigestURI.toDigestURI(anchor).hash();
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//System.out.println("*** addCitationIndex: urlhash = " + ASCII.String(urlhash) + ", refhash = " + ASCII.String(refhash) + ", urldate = " + urlModified.toString());
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if (this.urlCitationIndex != null) try {
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this.urlCitationIndex.add(refhash, new CitationReference(urlhash, urldate));
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} catch (final Exception e) {
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Log.logException(e);
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}
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refCount++;
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}
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return refCount;
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}
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public synchronized void close() {
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if (this.termIndex != null) this.termIndex.close();
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if (this.fulltext != null) this.fulltext.close();
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if (this.urlCitationIndex != null) this.urlCitationIndex.close();
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}
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private static String votedLanguage(
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final DigestURI url,
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final String urlNormalform,
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final Document document,
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final Condenser condenser) {
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// do a identification of the language
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String language = condenser.language(); // this is a statistical analysation of the content: will be compared with other attributes
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final String bymetadata = document.dc_language(); // the languageByMetadata may return null if there was no declaration
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if (language == null) {
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// no statistics available, we take either the metadata (if given) or the TLD
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language = (bymetadata == null) ? url.language() : bymetadata;
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} else {
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if (bymetadata == null) {
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// two possible results: compare and report conflicts
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if (!language.equals(url.language())) {
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// see if we have a hint in the url that the statistic was right
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final String u = urlNormalform.toLowerCase();
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if (!u.contains("/" + language + "/") && !u.contains("/" + ISO639.country(language).toLowerCase() + "/")) {
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// no confirmation using the url, use the TLD
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language = url.language();
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} else {
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// this is a strong hint that the statistics was in fact correct
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}
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}
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} else {
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// here we have three results: we can do a voting
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if (language.equals(bymetadata)) {
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//if (log.isFine()) log.logFine("LANGUAGE-BY-STATISTICS: " + entry.url() + " CONFIRMED - METADATA IDENTICAL: " + language);
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} else if (language.equals(url.language())) {
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//if (log.isFine()) log.logFine("LANGUAGE-BY-STATISTICS: " + entry.url() + " CONFIRMED - TLD IS IDENTICAL: " + language);
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} else if (bymetadata.equals(url.language())) {
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//if (log.isFine()) log.logFine("LANGUAGE-BY-STATISTICS: " + entry.url() + " CONFLICTING: " + language + " BUT METADATA AND TLD ARE IDENTICAL: " + bymetadata + ")");
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language = bymetadata;
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} else {
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//if (log.isFine()) log.logFine("LANGUAGE-BY-STATISTICS: " + entry.url() + " CONFLICTING: ALL DIFFERENT! statistic: " + language + ", metadata: " + bymetadata + ", TLD: + " + entry.url().language() + ". taking metadata.");
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language = bymetadata;
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}
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}
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}
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return language;
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}
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public void storeRWI(final ReferenceContainer<WordReference> wordContainer) throws IOException, SpaceExceededException {
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if (this.termIndex != null) this.termIndex.add(wordContainer);
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}
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public void storeRWI(final byte[] termHash, final WordReference entry) throws IOException, SpaceExceededException {
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if (this.termIndex != null) this.termIndex.add(termHash, entry);
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}
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public SolrInputDocument storeDocument(
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final DigestURI url,
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final DigestURI referrerURL,
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final CrawlProfile profile,
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final ResponseHeader responseHeader,
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final Document document,
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final Condenser condenser,
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final SearchEvent searchEvent,
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final String sourceName,
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final boolean storeToRWI
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) {
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final long startTime = System.currentTimeMillis();
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// CREATE INDEX
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// load some document metadata
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final Date loadDate = new Date();
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final String id = ASCII.String(url.hash());
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final String dc_title = document.dc_title();
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final String urlNormalform = url.toNormalform(true);
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final String language = votedLanguage(url, urlNormalform, document, condenser); // identification of the language
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// STORE URL TO LOADED-URL-DB
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Date modDate = responseHeader == null ? new Date() : responseHeader.lastModified();
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if (modDate.getTime() > loadDate.getTime()) modDate = loadDate;
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char docType = Response.docType(document.dc_format());
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// CREATE SOLR DOCUMENT
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final SolrInputDocument solrInputDoc = this.fulltext.getSolrScheme().yacy2solr(id, profile, responseHeader, document, condenser, referrerURL, language, urlCitationIndex);
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// FIND OUT IF THIS IS A DOUBLE DOCUMENT
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for (YaCySchema[] checkfields: new YaCySchema[][]{
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{YaCySchema.exact_signature_l, YaCySchema.exact_signature_unique_b},
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{YaCySchema.fuzzy_signature_l, YaCySchema.fuzzy_signature_unique_b}}) {
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YaCySchema hashfield = checkfields[0];
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YaCySchema uniquefield = checkfields[1];
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if (this.fulltext.getSolrScheme().contains(hashfield) && this.fulltext.getSolrScheme().contains(uniquefield)) {
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// lookup the document with the same signature
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long signature = ((Long) solrInputDoc.getField(hashfield.getSolrFieldName()).getValue()).longValue();
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try {
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if (this.fulltext.getSolr().exists(hashfield.getSolrFieldName(), Long.toString(signature))) {
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// change unique attribut in content
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solrInputDoc.setField(uniquefield.getSolrFieldName(), false);
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}
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} catch (IOException e) {}
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}
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}
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// ENRICH DOCUMENT WITH RANKING INFORMATION
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if (this.urlCitationIndex != null && this.fulltext.getSolrScheme().contains(YaCySchema.references_i)) {
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int references = this.urlCitationIndex.count(url.hash());
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if (references > 0) solrInputDoc.setField(YaCySchema.references_i.getSolrFieldName(), references);
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}
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// STORE TO SOLR
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String error = null;
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tryloop: for (int i = 0; i < 20; i++) {
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try {
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error = null;
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this.fulltext.putDocument(solrInputDoc);
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break tryloop;
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} catch ( final IOException e ) {
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error = "failed to send " + urlNormalform + " to solr";
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Log.logWarning("SOLR", error + e.getMessage());
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if (i == 10) this.fulltext.commit();
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try {Thread.sleep(1000);} catch (InterruptedException e1) {}
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continue tryloop;
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}
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}
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if (error != null) {
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Log.logWarning("SOLR", error + ", pausing Crawler!");
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// pause the crawler!!!
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Switchboard.getSwitchboard().pauseCrawlJob(SwitchboardConstants.CRAWLJOB_LOCAL_CRAWL, error);
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Switchboard.getSwitchboard().pauseCrawlJob(SwitchboardConstants.CRAWLJOB_REMOTE_TRIGGERED_CRAWL, error);
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}
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final long storageEndTime = System.currentTimeMillis();
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// STORE PAGE INDEX INTO WORD INDEX DB
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int outlinksSame = document.inboundLinks().size();
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int outlinksOther = document.outboundLinks().size();
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final RankingProcess rankingProcess = (searchEvent == null) ? null : searchEvent.rankingProcess;
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final int urlLength = urlNormalform.length();
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final int urlComps = MultiProtocolURI.urlComps(url.toString()).length;
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// create a word prototype which is re-used for all entries
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if ((this.termIndex != null && storeToRWI) || searchEvent != null) {
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final int len = (document == null) ? urlLength : document.dc_title().length();
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final WordReferenceRow ientry = new WordReferenceRow(
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url.hash(),
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urlLength, urlComps, len,
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condenser.RESULT_NUMB_WORDS,
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condenser.RESULT_NUMB_SENTENCES,
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modDate.getTime(),
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System.currentTimeMillis(),
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UTF8.getBytes(language),
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docType,
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outlinksSame, outlinksOther);
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// iterate over all words of content text
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Word wprop = null;
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byte[] wordhash;
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String word;
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for (Map.Entry<String, Word> wentry: condenser.words().entrySet()) {
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word = wentry.getKey();
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wprop = wentry.getValue();
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assert (wprop.flags != null);
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ientry.setWord(wprop);
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wordhash = Word.word2hash(word);
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if (this.termIndex != null && storeToRWI) try {
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this.termIndex.add(wordhash, ientry);
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} catch (final Exception e) {
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Log.logException(e);
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}
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// during a search event it is possible that a heuristic is used which aquires index
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// data during search-time. To transfer indexed data directly to the search process
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// the following lines push the index data additionally to the search process
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// this is done only for searched words
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if (searchEvent != null && !searchEvent.query.getQueryGoal().getExcludeHashes().has(wordhash) && searchEvent.query.getQueryGoal().getIncludeHashes().has(wordhash)) {
|
|
// if the page was added in the context of a heuristic this shall ensure that findings will fire directly into the search result
|
|
ReferenceContainer<WordReference> container;
|
|
try {
|
|
container = ReferenceContainer.emptyContainer(Segment.wordReferenceFactory, wordhash, 1);
|
|
container.add(ientry);
|
|
rankingProcess.add(container, true, sourceName, -1, 5000);
|
|
} catch (final SpaceExceededException e) {
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
if (searchEvent != null) searchEvent.rankingProcess.addFinalize();
|
|
|
|
// assign the catchall word
|
|
ientry.setWord(wprop == null ? catchallWord : wprop); // we use one of the word properties as template to get the document characteristics
|
|
if (this.termIndex != null) try {
|
|
this.termIndex.add(catchallHash, ientry);
|
|
} catch (final Exception e) {
|
|
Log.logException(e);
|
|
}
|
|
}
|
|
|
|
// STORE PAGE REFERENCES INTO CITATION INDEX
|
|
final int refs = addCitationIndex(url, modDate, document.getAnchors());
|
|
|
|
// finish index time
|
|
final long indexingEndTime = System.currentTimeMillis();
|
|
|
|
if (this.log.isInfo()) {
|
|
this.log.logInfo("*Indexed " + condenser.words().size() + " words in URL " + url +
|
|
" [" + id + "]" +
|
|
"\n\tDescription: " + dc_title +
|
|
"\n\tMimeType: " + document.dc_format() + " | Charset: " + document.getCharset() + " | " +
|
|
"Size: " + document.getTextLength() + " bytes | " +
|
|
"Anchors: " + refs +
|
|
"\n\tLinkStorageTime: " + (storageEndTime - startTime) + " ms | " +
|
|
"indexStorageTime: " + (indexingEndTime - storageEndTime) + " ms");
|
|
}
|
|
|
|
// finished
|
|
return solrInputDoc;
|
|
}
|
|
|
|
public void removeAllUrlReferences(final HandleSet urls, final LoaderDispatcher loader, final CacheStrategy cacheStrategy) {
|
|
for (final byte[] urlhash: urls) removeAllUrlReferences(urlhash, loader, cacheStrategy);
|
|
}
|
|
|
|
/**
|
|
* find all the words in a specific resource and remove the url reference from every word index
|
|
* finally, delete the url entry
|
|
* @param urlhash the hash of the url that shall be removed
|
|
* @param loader
|
|
* @param cacheStrategy
|
|
* @return number of removed words
|
|
*/
|
|
public int removeAllUrlReferences(final byte[] urlhash, final LoaderDispatcher loader, final CacheStrategy cacheStrategy) {
|
|
|
|
if (urlhash == null) return 0;
|
|
// determine the url string
|
|
final DigestURI url = fulltext().getURL(urlhash);
|
|
if (url == null) return 0;
|
|
|
|
try {
|
|
// parse the resource
|
|
final Document document = Document.mergeDocuments(url, null, loader.loadDocuments(loader.request(url, true, false), cacheStrategy, Integer.MAX_VALUE, null, CrawlQueues.queuedMinLoadDelay));
|
|
if (document == null) {
|
|
// delete just the url entry
|
|
fulltext().remove(urlhash);
|
|
return 0;
|
|
}
|
|
// get the word set
|
|
Set<String> words = null;
|
|
words = new Condenser(document, true, true, null, null, false).words().keySet();
|
|
|
|
// delete all word references
|
|
int count = 0;
|
|
if (words != null) count = termIndex().remove(Word.words2hashesHandles(words), urlhash);
|
|
|
|
// finally delete the url entry itself
|
|
fulltext().remove(urlhash);
|
|
return count;
|
|
} catch (final Parser.Failure e) {
|
|
return 0;
|
|
} catch (final IOException e) {
|
|
Log.logException(e);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
}
|