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502 lines
25 KiB
502 lines
25 KiB
// plasmaSearchEvent.java
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// -----------------------
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// part of YACY
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// (C) by Michael Peter Christen; mc@anomic.de
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// first published on http://www.anomic.de
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// Frankfurt, Germany, 2005
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// Created: 10.10.2005
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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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//
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// Using this software in any meaning (reading, learning, copying, compiling,
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// running) means that you agree that the Author(s) is (are) not responsible
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// for cost, loss of data or any harm that may be caused directly or indirectly
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// by usage of this softare or this documentation. The usage of this software
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// is on your own risk. The installation and usage (starting/running) of this
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// software may allow other people or application to access your computer and
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// any attached devices and is highly dependent on the configuration of the
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// software which must be done by the user of the software; the author(s) is
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// (are) also not responsible for proper configuration and usage of the
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// software, even if provoked by documentation provided together with
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// the software.
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//
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// Any changes to this file according to the GPL as documented in the file
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// gpl.txt aside this file in the shipment you received can be done to the
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// lines that follows this copyright notice here, but changes must not be
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// done inside the copyright notive above. A re-distribution must contain
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// the intact and unchanged copyright notice.
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// Contributions and changes to the program code must be marked as such.
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package de.anomic.plasma;
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import java.util.Collection;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.Iterator;
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import java.util.Map;
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import java.util.Set;
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import java.util.TreeMap;
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import de.anomic.index.indexContainer;
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import de.anomic.index.indexEntry;
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import de.anomic.kelondro.kelondroException;
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import de.anomic.kelondro.kelondroMSetTools;
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import de.anomic.server.logging.serverLog;
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import de.anomic.yacy.yacyCore;
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import de.anomic.yacy.yacySearch;
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public final class plasmaSearchEvent extends Thread implements Runnable {
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public static plasmaSearchEvent lastEvent = null;
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private static HashSet flushThreads = new HashSet();
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private serverLog log;
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private plasmaSearchQuery query;
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private plasmaSearchRankingProfile ranking;
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private plasmaWordIndex wordIndex;
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private plasmaCrawlLURL urlStore;
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private plasmaSnippetCache snippetCache;
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private indexContainer rcContainers; // cache for results
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private int rcContainerFlushCount;
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private Map rcAbstracts; // cache for index abstracts; word:TreeMap mapping where the embedded TreeMap is a urlhash:peerlist relation
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private plasmaSearchTimingProfile profileLocal, profileGlobal;
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private boolean postsort;
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private yacySearch[] primarySearchThreads, secondarySearchThreads;
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public plasmaSearchEvent(plasmaSearchQuery query,
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plasmaSearchRankingProfile ranking,
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plasmaSearchTimingProfile localTiming,
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plasmaSearchTimingProfile remoteTiming,
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boolean postsort,
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serverLog log,
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plasmaWordIndex wordIndex,
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plasmaCrawlLURL urlStore,
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plasmaSnippetCache snippetCache) {
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this.log = log;
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this.wordIndex = wordIndex;
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this.query = query;
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this.ranking = ranking;
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this.urlStore = urlStore;
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this.snippetCache = snippetCache;
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this.rcContainers = new indexContainer(null, wordIndex.payloadrow());
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this.rcContainerFlushCount = 0;
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this.rcAbstracts = (query.size() > 1) ? new TreeMap() : null; // generate abstracts only for combined searches
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this.profileLocal = localTiming;
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this.profileGlobal = remoteTiming;
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this.postsort = postsort;
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this.primarySearchThreads = null;
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this.secondarySearchThreads = null;
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}
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public plasmaSearchQuery getQuery() {
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return query;
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}
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public plasmaSearchTimingProfile getLocalTiming() {
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return profileLocal;
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}
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public yacySearch[] getPrimarySearchThreads() {
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return primarySearchThreads;
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}
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public yacySearch[] getSecondarySearchThreads() {
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return secondarySearchThreads;
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}
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public plasmaSearchResult search() {
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// combine all threads
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// we synchronize with flushThreads to allow only one local search at a time,
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// so all search tasks are queued
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synchronized (flushThreads) {
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if (query.domType == plasmaSearchQuery.SEARCHDOM_GLOBALDHT) {
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int fetchpeers = (int) (query.maximumTime / 500L); // number of target peers; means 10 peers in 10 seconds
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if (fetchpeers > 50) fetchpeers = 50;
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if (fetchpeers < 30) fetchpeers = 30;
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// remember time
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long start = System.currentTimeMillis();
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// do a global search
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// the result of the fetch is then in the rcGlobal
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log.logFine("STARTING " + fetchpeers + " THREADS TO CATCH EACH " + profileGlobal.getTargetCount(plasmaSearchTimingProfile.PROCESS_POSTSORT) + " URLs WITHIN " + (profileGlobal.duetime() / 1000) + " SECONDS");
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long secondaryTimeout = System.currentTimeMillis() + profileGlobal.duetime() / 3 * 2;
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long primaryTimeout = System.currentTimeMillis() + profileGlobal.duetime();
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primarySearchThreads = yacySearch.primaryRemoteSearches(plasmaSearchQuery.hashSet2hashString(query.queryHashes), "",
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query.prefer, query.urlMask, query.maxDistance, urlStore, rcContainers, rcAbstracts,
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fetchpeers, plasmaSwitchboard.urlBlacklist, snippetCache, profileGlobal, ranking);
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// meanwhile do a local search
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Map searchContainerMap = localSearchContainers(null);
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// use the search containers to fill up rcAbstracts locally
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/*
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if ((rcAbstracts != null) && (searchContainerMap != null)) {
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Iterator i, ci = searchContainerMap.entrySet().iterator();
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Map.Entry entry;
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String wordhash;
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indexContainer container;
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TreeMap singleAbstract;
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String mypeerhash = yacyCore.seedDB.mySeed.hash;
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while (ci.hasNext()) {
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entry = (Map.Entry) ci.next();
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wordhash = (String) entry.getKey();
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container = (indexContainer) entry.getValue();
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// collect all urlhashes from the container
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synchronized (rcAbstracts) {
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singleAbstract = (TreeMap) rcAbstracts.get(wordhash); // a mapping from url-hashes to a string of peer-hashes
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if (singleAbstract == null) singleAbstract = new TreeMap();
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i = container.entries();
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while (i.hasNext()) singleAbstract.put(((indexEntry) i.next()).urlHash(), mypeerhash);
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rcAbstracts.put(wordhash, singleAbstract);
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}
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}
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}
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*/
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// try to pre-fetch some LURLs if there is enough time
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indexContainer rcLocal = localSearchJoin(searchContainerMap.values());
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prefetchLocal(rcLocal, secondaryTimeout);
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// this is temporary debugging code to learn that the index abstracts are fetched correctly
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while (System.currentTimeMillis() < secondaryTimeout) {
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if (yacySearch.remainingWaiting(primarySearchThreads) == 0) break; // all threads have finished
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try {Thread.sleep(100);} catch (InterruptedException e) {}
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}
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// evaluate index abstracts and start a secondary search
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if (rcAbstracts != null) prepareSecondarySearch();
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// catch up global results:
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// wait until primary timeout passed
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while (System.currentTimeMillis() < primaryTimeout) {
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if ((yacySearch.remainingWaiting(primarySearchThreads) == 0) &&
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((secondarySearchThreads == null) || (yacySearch.remainingWaiting(secondarySearchThreads) == 0))) break; // all threads have finished
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try {Thread.sleep(100);} catch (InterruptedException e) {}
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}
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int globalContributions = rcContainers.size();
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// finished searching
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log.logFine("SEARCH TIME AFTER GLOBAL-TRIGGER TO " + fetchpeers + " PEERS: " + ((System.currentTimeMillis() - start) / 1000) + " seconds");
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// combine the result and order
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plasmaSearchResult result = orderFinal(rcLocal);
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if (result != null) {
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result.globalContributions = globalContributions;
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result.localContributions = (rcLocal == null) ? 0 : rcLocal.size();
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// flush results in a separate thread
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this.start(); // start to flush results
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}
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// return search result
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log.logFine("SEARCHRESULT: " + profileLocal.reportToString());
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lastEvent = this;
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return result;
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} else {
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Map searchContainerMap = localSearchContainers(null);
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indexContainer rcLocal = (searchContainerMap == null) ? wordIndex.emptyContainer(null) : localSearchJoin(searchContainerMap.values());
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plasmaSearchResult result = orderFinal(rcLocal);
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result.localContributions = rcLocal.size();
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// return search result
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log.logFine("SEARCHRESULT: " + profileLocal.reportToString());
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lastEvent = this;
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return result;
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}
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}
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}
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private void prepareSecondarySearch() {
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// catch up index abstracts and join them; then call peers again to submit their urls
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System.out.println("DEBUG-INDEXABSTRACT: " + rcAbstracts.size() + " word references catched, " + query.size() + " needed");
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if (rcAbstracts.size() != query.size()) return; // secondary search not possible
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Iterator i = rcAbstracts.entrySet().iterator();
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Map.Entry entry;
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while (i.hasNext()) {
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entry = (Map.Entry) i.next();
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System.out.println("DEBUG-INDEXABSTRACT: hash " + (String) entry.getKey() + ": " + ((query.queryHashes.contains((String) entry.getKey())) ? "NEEDED" : "NOT NEEDED") + "; " + ((TreeMap) entry.getValue()).size() + " entries");
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}
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TreeMap abstractJoin = (rcAbstracts.size() == query.size()) ? kelondroMSetTools.joinConstructive(rcAbstracts.values(), true) : new TreeMap();
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if (abstractJoin.size() == 0) {
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System.out.println("DEBUG-INDEXABSTRACT: no success using index abstracts from remote peers");
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} else {
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System.out.println("DEBUG-INDEXABSTRACT: index abstracts delivered " + abstractJoin.size() + " additional results for secondary search");
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// generate query for secondary search
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TreeMap secondarySearchURLs = new TreeMap(); // a (peerhash:urlhash-liststring) mapping
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Iterator i1 = abstractJoin.entrySet().iterator();
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Map.Entry entry1;
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String url, urls, peer, peers;
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String mypeerhash = yacyCore.seedDB.mySeed.hash;
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boolean mypeerinvolved = false;
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int mypeercount;
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while (i1.hasNext()) {
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entry1 = (Map.Entry) i1.next();
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url = (String) entry1.getKey();
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peers = (String) entry1.getValue();
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System.out.println("DEBUG-INDEXABSTRACT: url " + url + ": from peers " + peers);
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mypeercount = 0;
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for (int j = 0; j < peers.length(); j = j + 12) {
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peer = peers.substring(j, j + 12);
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if ((peer.equals(mypeerhash)) && (mypeercount++ > 1)) continue;
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//if (peers.indexOf(peer) < j) continue; // avoid doubles that may appear in the abstractJoin
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urls = (String) secondarySearchURLs.get(peer);
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urls = (urls == null) ? url : urls + url;
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secondarySearchURLs.put(peer, urls);
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}
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if (mypeercount == 1) mypeerinvolved = true;
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}
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// compute words for secondary search and start the secondary searches
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i1 = secondarySearchURLs.entrySet().iterator();
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String words;
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secondarySearchThreads = new yacySearch[(mypeerinvolved) ? secondarySearchURLs.size() - 1 : secondarySearchURLs.size()];
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int c = 0;
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while (i1.hasNext()) {
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entry1 = (Map.Entry) i1.next();
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peer = (String) entry1.getKey();
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if (peer.equals(mypeerhash)) continue; // we dont need to ask ourself
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urls = (String) entry1.getValue();
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words = wordsFromPeer(peer, urls);
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System.out.println("DEBUG-INDEXABSTRACT ***: peer " + peer + " has urls: " + urls);
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System.out.println("DEBUG-INDEXABSTRACT ***: peer " + peer + " from words: " + words);
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secondarySearchThreads[c++] = yacySearch.secondaryRemoteSearch(
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words, urls, urlStore, rcContainers, peer, plasmaSwitchboard.urlBlacklist, snippetCache,
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profileGlobal, ranking);
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}
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}
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}
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private String wordsFromPeer(String peerhash, String urls) {
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Map.Entry entry;
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String word, peerlist, url, wordlist = "";
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TreeMap urlPeerlist;
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int p;
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boolean hasURL;
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synchronized (rcAbstracts) {
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Iterator i = rcAbstracts.entrySet().iterator();
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while (i.hasNext()) {
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entry = (Map.Entry) i.next();
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word = (String) entry.getKey();
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urlPeerlist = (TreeMap) entry.getValue();
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hasURL = true;
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for (int j = 0; j < urls.length(); j = j + 12) {
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url = urls.substring(j, j + 12);
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peerlist = (String) urlPeerlist.get(url);
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p = (peerlist == null) ? -1 : peerlist.indexOf(peerhash);
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if ((p < 0) || (p % 12 != 0)) {
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hasURL = false;
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break;
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}
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}
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if (hasURL) wordlist += word;
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}
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}
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return wordlist;
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}
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public Map localSearchContainers(Set urlselection) {
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// search for the set of hashes and return a map of of wordhash:indexContainer containing the seach result
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// retrieve entities that belong to the hashes
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profileLocal.startTimer();
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Map containers = wordIndex.getContainers(
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query.queryHashes,
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urlselection,
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true,
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true,
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profileLocal.getTargetTime(plasmaSearchTimingProfile.PROCESS_COLLECTION));
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if ((containers.size() != 0) && (containers.size() < query.size())) containers = new HashMap(); // prevent that only a subset is returned
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profileLocal.setYieldTime(plasmaSearchTimingProfile.PROCESS_COLLECTION);
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profileLocal.setYieldCount(plasmaSearchTimingProfile.PROCESS_COLLECTION, containers.size());
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return containers;
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}
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public indexContainer localSearchJoin(Collection containers) {
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// join a search result and return the joincount (number of pages after join)
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// since this is a conjunction we return an empty entity if any word is not known
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if (containers == null) return wordIndex.emptyContainer(null);
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// join the result
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profileLocal.startTimer();
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indexContainer rcLocal = indexContainer.joinContainer(containers,
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profileLocal.getTargetTime(plasmaSearchTimingProfile.PROCESS_JOIN),
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query.maxDistance);
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if (rcLocal == null) rcLocal = wordIndex.emptyContainer(null);
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profileLocal.setYieldTime(plasmaSearchTimingProfile.PROCESS_JOIN);
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profileLocal.setYieldCount(plasmaSearchTimingProfile.PROCESS_JOIN, rcLocal.size());
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return rcLocal;
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}
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public plasmaSearchResult orderFinal(indexContainer rcLocal) {
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// we collect the urlhashes and construct a list with urlEntry objects
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// attention: if minEntries is too high, this method will not terminate within the maxTime
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assert (rcLocal != null);
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indexContainer searchResult = new indexContainer(null, rcLocal.row());
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long preorderTime = profileLocal.getTargetTime(plasmaSearchTimingProfile.PROCESS_PRESORT);
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profileLocal.startTimer();
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long pst = System.currentTimeMillis();
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searchResult.add(rcLocal, preorderTime);
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searchResult.add(rcContainers, preorderTime);
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preorderTime = preorderTime - (System.currentTimeMillis() - pst);
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if (preorderTime < 0) preorderTime = 200;
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plasmaSearchPreOrder preorder = new plasmaSearchPreOrder(query, ranking, searchResult, preorderTime);
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if (searchResult.size() > query.wantedResults) preorder.remove(true, true);
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profileLocal.setYieldTime(plasmaSearchTimingProfile.PROCESS_PRESORT);
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profileLocal.setYieldCount(plasmaSearchTimingProfile.PROCESS_PRESORT, rcLocal.size());
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// start url-fetch
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long postorderTime = profileLocal.getTargetTime(plasmaSearchTimingProfile.PROCESS_POSTSORT);
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System.out.println("DEBUG: postorder-final (urlfetch) maxtime = " + postorderTime);
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long postorderLimitTime = (postorderTime < 0) ? Long.MAX_VALUE : (System.currentTimeMillis() + postorderTime);
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profileLocal.startTimer();
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plasmaSearchResult acc = new plasmaSearchResult(query, ranking);
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//if (searchResult == null) return acc; // strange case where searchResult is not proper: acc is then empty
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//if (searchResult.size() == 0) return acc; // case that we have nothing to do
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indexEntry entry;
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plasmaCrawlLURLEntry page;
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Long preranking;
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Object[] preorderEntry;
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int minEntries = profileLocal.getTargetCount(plasmaSearchTimingProfile.PROCESS_POSTSORT);
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try {
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while (preorder.hasNext()) {
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if ((System.currentTimeMillis() >= postorderLimitTime) && (acc.sizeFetched() >= minEntries)) break;
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preorderEntry = preorder.next();
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entry = (indexEntry) preorderEntry[0];
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// load only urls if there was not yet a root url of that hash
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preranking = (Long) preorderEntry[1];
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// find the url entry
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page = urlStore.load(entry.urlHash(), entry);
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// add a result
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if (page != null) acc.addResult(page, preranking);
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}
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} catch (kelondroException ee) {
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serverLog.logSevere("PLASMA", "Database Failure during plasmaSearch.order: " + ee.getMessage(), ee);
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}
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profileLocal.setYieldTime(plasmaSearchTimingProfile.PROCESS_URLFETCH);
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profileLocal.setYieldCount(plasmaSearchTimingProfile.PROCESS_URLFETCH, acc.sizeFetched());
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// start postsorting
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profileLocal.startTimer();
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acc.sortResults(postsort);
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profileLocal.setYieldTime(plasmaSearchTimingProfile.PROCESS_POSTSORT);
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profileLocal.setYieldCount(plasmaSearchTimingProfile.PROCESS_POSTSORT, acc.sizeOrdered());
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// apply filter
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profileLocal.startTimer();
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acc.removeRedundant();
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profileLocal.setYieldTime(plasmaSearchTimingProfile.PROCESS_FILTER);
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profileLocal.setYieldCount(plasmaSearchTimingProfile.PROCESS_FILTER, acc.sizeOrdered());
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return acc;
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}
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private void prefetchLocal(indexContainer rcLocal, long timeout) {
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// pre-fetch some urls to fill LURL ram cache
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if (rcLocal == null) return;
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plasmaSearchPreOrder preorder = new plasmaSearchPreOrder(query, ranking, rcLocal, timeout - System.currentTimeMillis());
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preorder.remove(true, true);
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// start url-fetch
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indexEntry entry;
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try {
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while (preorder.hasNext()) {
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if (System.currentTimeMillis() >= timeout) break;
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entry = (indexEntry) (preorder.next()[0]);
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// find and fetch the url entry
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urlStore.load(entry.urlHash(), entry);
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}
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} catch (kelondroException ee) {
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serverLog.logSevere("PLASMA", "Database Failure during plasmaSearch.order: " + ee.getMessage(), ee);
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}
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}
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public void run() {
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flushThreads.add(this); // this will care that the search event object is referenced from somewhere while it is still alive
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// put all new results into wordIndex
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// this must be called after search results had been computed
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// it is wise to call this within a separate thread because
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// this method waits until all threads are finished
|
|
serverLog.logFine("PLASMA", "STARTED FLUSHING GLOBAL SEARCH RESULTS FOR SEARCH " + query.queryWords);
|
|
|
|
int remaining = 0;
|
|
if (primarySearchThreads == null) return;
|
|
long starttime = System.currentTimeMillis();
|
|
while (true) {
|
|
flushGlobalResults(); // must be flushed before first check of remaining threads, othervise it is possible that NO results are flushed at all
|
|
|
|
remaining = yacySearch.remainingWaiting(primarySearchThreads);
|
|
if (secondarySearchThreads != null) remaining += yacySearch.remainingWaiting(secondarySearchThreads);
|
|
if (remaining == 0) break;
|
|
|
|
// wait a little bit before trying again
|
|
try {Thread.sleep(1000);} catch (InterruptedException e) {}
|
|
if (System.currentTimeMillis() - starttime > 90000) {
|
|
yacySearch.interruptAlive(primarySearchThreads);
|
|
if (secondarySearchThreads != null) yacySearch.interruptAlive(secondarySearchThreads);
|
|
log.logFine("SEARCH FLUSH: " + remaining + " PEERS STILL BUSY; ABANDONED; SEARCH WAS " + query.queryWords);
|
|
break;
|
|
}
|
|
//log.logFine("FINISHED FLUSH RESULTS PROCESS for query " + query.hashes(","));
|
|
}
|
|
|
|
serverLog.logFine("PLASMA", "FINISHED FLUSHING " + rcContainerFlushCount + " GLOBAL SEARCH RESULTS FOR SEARCH " + query.queryWords);
|
|
|
|
// finally delete the temporary index
|
|
rcContainers = null;
|
|
|
|
flushThreads.remove(this);
|
|
}
|
|
|
|
public void flushGlobalResults() {
|
|
// flush the rcGlobal as much as is there so far
|
|
// this must be called sometime after search results had been computed
|
|
int count = 0;
|
|
if ((rcContainers != null) && (rcContainers.size() > 0)) {
|
|
synchronized (rcContainers) {
|
|
String wordHash;
|
|
Iterator hashi = query.queryHashes.iterator();
|
|
while (hashi.hasNext()) {
|
|
wordHash = (String) hashi.next();
|
|
rcContainers.setWordHash(wordHash);
|
|
wordIndex.addEntries(rcContainers, System.currentTimeMillis(), true);
|
|
log.logFine("FLUSHED " + wordHash + ": " + rcContainers.size() + " url entries");
|
|
}
|
|
// the rcGlobal was flushed, empty it
|
|
count += rcContainers.size();
|
|
rcContainers.clear();
|
|
}
|
|
}
|
|
rcContainerFlushCount += count;
|
|
}
|
|
|
|
}
|