X-Git-Url: https://git.mdrn.pl/pylucene.git/blobdiff_plain/a2e61f0c04805cfcb8706176758d1283c7e3a55c..aaeed5504b982cf3545252ab528713250aa33eed:/lucene-java-3.4.0/lucene/src/java/org/apache/lucene/index/BufferedDeletesStream.java diff --git a/lucene-java-3.4.0/lucene/src/java/org/apache/lucene/index/BufferedDeletesStream.java b/lucene-java-3.4.0/lucene/src/java/org/apache/lucene/index/BufferedDeletesStream.java deleted file mode 100644 index a8bda0e..0000000 --- a/lucene-java-3.4.0/lucene/src/java/org/apache/lucene/index/BufferedDeletesStream.java +++ /dev/null @@ -1,426 +0,0 @@ -package org.apache.lucene.index; - -/** - * 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. - */ - -import java.io.IOException; -import java.io.PrintStream; -import java.util.List; -import java.util.ArrayList; -import java.util.Date; -import java.util.Comparator; -import java.util.Collections; -import java.util.concurrent.atomic.AtomicInteger; -import java.util.concurrent.atomic.AtomicLong; - -import org.apache.lucene.search.DocIdSet; -import org.apache.lucene.search.DocIdSetIterator; -import org.apache.lucene.search.Query; -import org.apache.lucene.search.QueryWrapperFilter; -import org.apache.lucene.util.BytesRef; - -/* Tracks the stream of {@link BuffereDeletes}. - * When DocumensWriter flushes, its buffered - * deletes are appended to this stream. We later - * apply these deletes (resolve them to the actual - * docIDs, per segment) when a merge is started - * (only to the to-be-merged segments). We - * also apply to all segments when NRT reader is pulled, - * commit/close is called, or when too many deletes are - * buffered and must be flushed (by RAM usage or by count). - * - * Each packet is assigned a generation, and each flushed or - * merged segment is also assigned a generation, so we can - * track which BufferedDeletes packets to apply to any given - * segment. */ - -class BufferedDeletesStream { - - // TODO: maybe linked list? - private final List deletes = new ArrayList(); - - // Starts at 1 so that SegmentInfos that have never had - // deletes applied (whose bufferedDelGen defaults to 0) - // will be correct: - private long nextGen = 1; - - // used only by assert - private Term lastDeleteTerm; - - private PrintStream infoStream; - private final AtomicLong bytesUsed = new AtomicLong(); - private final AtomicInteger numTerms = new AtomicInteger(); - private final int messageID; - - public BufferedDeletesStream(int messageID) { - this.messageID = messageID; - } - - private synchronized void message(String message) { - if (infoStream != null) { - infoStream.println("BD " + messageID + " [" + new Date() + "; " + Thread.currentThread().getName() + "]: " + message); - } - } - - public synchronized void setInfoStream(PrintStream infoStream) { - this.infoStream = infoStream; - } - - // Appends a new packet of buffered deletes to the stream, - // setting its generation: - public synchronized void push(FrozenBufferedDeletes packet) { - assert packet.any(); - assert checkDeleteStats(); - assert packet.gen < nextGen; - deletes.add(packet); - numTerms.addAndGet(packet.numTermDeletes); - bytesUsed.addAndGet(packet.bytesUsed); - if (infoStream != null) { - message("push deletes " + packet + " delGen=" + packet.gen + " packetCount=" + deletes.size()); - } - assert checkDeleteStats(); - } - - public synchronized void clear() { - deletes.clear(); - nextGen = 1; - numTerms.set(0); - bytesUsed.set(0); - } - - public boolean any() { - return bytesUsed.get() != 0; - } - - public int numTerms() { - return numTerms.get(); - } - - public long bytesUsed() { - return bytesUsed.get(); - } - - public static class ApplyDeletesResult { - // True if any actual deletes took place: - public final boolean anyDeletes; - - // Current gen, for the merged segment: - public final long gen; - - // If non-null, contains segments that are 100% deleted - public final List allDeleted; - - ApplyDeletesResult(boolean anyDeletes, long gen, List allDeleted) { - this.anyDeletes = anyDeletes; - this.gen = gen; - this.allDeleted = allDeleted; - } - } - - // Sorts SegmentInfos from smallest to biggest bufferedDelGen: - private static final Comparator sortByDelGen = new Comparator() { - // @Override -- not until Java 1.6 - public int compare(SegmentInfo si1, SegmentInfo si2) { - final long cmp = si1.getBufferedDeletesGen() - si2.getBufferedDeletesGen(); - if (cmp > 0) { - return 1; - } else if (cmp < 0) { - return -1; - } else { - return 0; - } - } - }; - - /** Resolves the buffered deleted Term/Query/docIDs, into - * actual deleted docIDs in the deletedDocs BitVector for - * each SegmentReader. */ - public synchronized ApplyDeletesResult applyDeletes(IndexWriter.ReaderPool readerPool, List infos) throws IOException { - final long t0 = System.currentTimeMillis(); - - if (infos.size() == 0) { - return new ApplyDeletesResult(false, nextGen++, null); - } - - assert checkDeleteStats(); - - if (!any()) { - message("applyDeletes: no deletes; skipping"); - return new ApplyDeletesResult(false, nextGen++, null); - } - - if (infoStream != null) { - message("applyDeletes: infos=" + infos + " packetCount=" + deletes.size()); - } - - List infos2 = new ArrayList(); - infos2.addAll(infos); - Collections.sort(infos2, sortByDelGen); - - CoalescedDeletes coalescedDeletes = null; - boolean anyNewDeletes = false; - - int infosIDX = infos2.size()-1; - int delIDX = deletes.size()-1; - - List allDeleted = null; - - while (infosIDX >= 0) { - //System.out.println("BD: cycle delIDX=" + delIDX + " infoIDX=" + infosIDX); - - final FrozenBufferedDeletes packet = delIDX >= 0 ? deletes.get(delIDX) : null; - final SegmentInfo info = infos2.get(infosIDX); - final long segGen = info.getBufferedDeletesGen(); - - if (packet != null && segGen < packet.gen) { - //System.out.println(" coalesce"); - if (coalescedDeletes == null) { - coalescedDeletes = new CoalescedDeletes(); - } - coalescedDeletes.update(packet); - delIDX--; - } else if (packet != null && segGen == packet.gen) { - //System.out.println(" eq"); - - // Lock order: IW -> BD -> RP - assert readerPool.infoIsLive(info); - SegmentReader reader = readerPool.get(info, false); - int delCount = 0; - final boolean segAllDeletes; - try { - if (coalescedDeletes != null) { - //System.out.println(" del coalesced"); - delCount += applyTermDeletes(coalescedDeletes.termsIterable(), reader); - delCount += applyQueryDeletes(coalescedDeletes.queriesIterable(), reader); - } - //System.out.println(" del exact"); - // Don't delete by Term here; DocumentsWriter - // already did that on flush: - delCount += applyQueryDeletes(packet.queriesIterable(), reader); - segAllDeletes = reader.numDocs() == 0; - } finally { - readerPool.release(reader); - } - anyNewDeletes |= delCount > 0; - - if (segAllDeletes) { - if (allDeleted == null) { - allDeleted = new ArrayList(); - } - allDeleted.add(info); - } - - if (infoStream != null) { - message("seg=" + info + " segGen=" + segGen + " segDeletes=[" + packet + "]; coalesced deletes=[" + (coalescedDeletes == null ? "null" : coalescedDeletes) + "] delCount=" + delCount + (segAllDeletes ? " 100% deleted" : "")); - } - - if (coalescedDeletes == null) { - coalescedDeletes = new CoalescedDeletes(); - } - coalescedDeletes.update(packet); - delIDX--; - infosIDX--; - info.setBufferedDeletesGen(nextGen); - - } else { - //System.out.println(" gt"); - - if (coalescedDeletes != null) { - // Lock order: IW -> BD -> RP - assert readerPool.infoIsLive(info); - SegmentReader reader = readerPool.get(info, false); - int delCount = 0; - final boolean segAllDeletes; - try { - delCount += applyTermDeletes(coalescedDeletes.termsIterable(), reader); - delCount += applyQueryDeletes(coalescedDeletes.queriesIterable(), reader); - segAllDeletes = reader.numDocs() == 0; - } finally { - readerPool.release(reader); - } - anyNewDeletes |= delCount > 0; - - if (segAllDeletes) { - if (allDeleted == null) { - allDeleted = new ArrayList(); - } - allDeleted.add(info); - } - - if (infoStream != null) { - message("seg=" + info + " segGen=" + segGen + " coalesced deletes=[" + (coalescedDeletes == null ? "null" : coalescedDeletes) + "] delCount=" + delCount + (segAllDeletes ? " 100% deleted" : "")); - } - } - info.setBufferedDeletesGen(nextGen); - - infosIDX--; - } - } - - assert checkDeleteStats(); - if (infoStream != null) { - message("applyDeletes took " + (System.currentTimeMillis()-t0) + " msec"); - } - // assert infos != segmentInfos || !any() : "infos=" + infos + " segmentInfos=" + segmentInfos + " any=" + any; - - return new ApplyDeletesResult(anyNewDeletes, nextGen++, allDeleted); - } - - public synchronized long getNextGen() { - return nextGen++; - } - - // Lock order IW -> BD - /* Removes any BufferedDeletes that we no longer need to - * store because all segments in the index have had the - * deletes applied. */ - public synchronized void prune(SegmentInfos segmentInfos) { - assert checkDeleteStats(); - long minGen = Long.MAX_VALUE; - for(SegmentInfo info : segmentInfos) { - minGen = Math.min(info.getBufferedDeletesGen(), minGen); - } - - if (infoStream != null) { - message("prune sis=" + segmentInfos + " minGen=" + minGen + " packetCount=" + deletes.size()); - } - - final int limit = deletes.size(); - for(int delIDX=0;delIDX= minGen) { - prune(delIDX); - assert checkDeleteStats(); - return; - } - } - - // All deletes pruned - prune(limit); - assert !any(); - assert checkDeleteStats(); - } - - private synchronized void prune(int count) { - if (count > 0) { - if (infoStream != null) { - message("pruneDeletes: prune " + count + " packets; " + (deletes.size() - count) + " packets remain"); - } - for(int delIDX=0;delIDX= 0; - bytesUsed.addAndGet(-packet.bytesUsed); - assert bytesUsed.get() >= 0; - } - deletes.subList(0, count).clear(); - } - } - - // Delete by Term - private synchronized long applyTermDeletes(Iterable termsIter, SegmentReader reader) throws IOException { - long delCount = 0; - - assert checkDeleteTerm(null); - - final TermDocs docs = reader.termDocs(); - - for (Term term : termsIter) { - - // Since we visit terms sorted, we gain performance - // by re-using the same TermsEnum and seeking only - // forwards - assert checkDeleteTerm(term); - docs.seek(term); - - while (docs.next()) { - final int docID = docs.doc(); - reader.deleteDocument(docID); - // TODO: we could/should change - // reader.deleteDocument to return boolean - // true if it did in fact delete, because here - // we could be deleting an already-deleted doc - // which makes this an upper bound: - delCount++; - } - } - - return delCount; - } - - public static class QueryAndLimit { - public final Query query; - public final int limit; - public QueryAndLimit(Query query, int limit) { - this.query = query; - this.limit = limit; - } - } - - // Delete by query - private synchronized long applyQueryDeletes(Iterable queriesIter, SegmentReader reader) throws IOException { - long delCount = 0; - - for (QueryAndLimit ent : queriesIter) { - Query query = ent.query; - int limit = ent.limit; - final DocIdSet docs = new QueryWrapperFilter(query).getDocIdSet(reader); - if (docs != null) { - final DocIdSetIterator it = docs.iterator(); - if (it != null) { - while(true) { - int doc = it.nextDoc(); - if (doc >= limit) - break; - - reader.deleteDocument(doc); - // TODO: we could/should change - // reader.deleteDocument to return boolean - // true if it did in fact delete, because here - // we could be deleting an already-deleted doc - // which makes this an upper bound: - delCount++; - } - } - } - } - - return delCount; - } - - // used only by assert - private boolean checkDeleteTerm(Term term) { - if (term != null) { - assert lastDeleteTerm == null || term.compareTo(lastDeleteTerm) > 0: "lastTerm=" + lastDeleteTerm + " vs term=" + term; - } - // TODO: we re-use term now in our merged iterable, but we shouldn't clone, instead copy for this assert - lastDeleteTerm = term == null ? null : new Term(term.field(), term.text()); - return true; - } - - // only for assert - private boolean checkDeleteStats() { - int numTerms2 = 0; - long bytesUsed2 = 0; - for(FrozenBufferedDeletes packet : deletes) { - numTerms2 += packet.numTermDeletes; - bytesUsed2 += packet.bytesUsed; - } - assert numTerms2 == numTerms.get(): "numTerms2=" + numTerms2 + " vs " + numTerms.get(); - assert bytesUsed2 == bytesUsed.get(): "bytesUsed2=" + bytesUsed2 + " vs " + bytesUsed; - return true; - } -}