X-Git-Url: https://git.mdrn.pl/pylucene.git/blobdiff_plain/a2e61f0c04805cfcb8706176758d1283c7e3a55c..aaeed5504b982cf3545252ab528713250aa33eed:/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/index/TieredMergePolicy.java?ds=sidebyside
diff --git a/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/index/TieredMergePolicy.java b/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/index/TieredMergePolicy.java
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+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.util.Map;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Comparator;
+import java.util.List;
+import java.util.ArrayList;
+
+/**
+ * Merges segments of approximately equal size, subject to
+ * an allowed number of segments per tier. This is similar
+ * to {@link LogByteSizeMergePolicy}, except this merge
+ * policy is able to merge non-adjacent segment, and
+ * separates how many segments are merged at once ({@link
+ * #setMaxMergeAtOnce}) from how many segments are allowed
+ * per tier ({@link #setSegmentsPerTier}). This merge
+ * policy also does not over-merge (ie, cascade merges).
+ *
+ * For normal merging, this policy first computes a
+ * "budget" of how many segments are allowed by be in the
+ * index. If the index is over-budget, then the policy
+ * sorts segments by decresing size (pro-rating by percent
+ * deletes), and then finds the least-cost merge. Merge
+ * cost is measured by a combination of the "skew" of the
+ * merge (size of largest seg divided by smallest seg),
+ * total merge size and pct deletes reclaimed,
+ * so that merges with lower skew, smaller size
+ * and those reclaiming more deletes, are
+ * favored.
+ *
+ *
If a merge will produce a segment that's larger than
+ * {@link #setMaxMergedSegmentMB}, then the policy will
+ * merge fewer segments (down to 1 at once, if that one has
+ * deletions) to keep the segment size under budget.
+ *
+ * NOTE: this policy freely merges non-adjacent
+ * segments; if this is a problem, use {@link
+ * LogMergePolicy}.
+ *
+ * NOTE: This policy always merges by byte size
+ * of the segments, always pro-rates by percent deletes,
+ * and does not apply any maximum segment size during
+ * forceMerge (unlike {@link LogByteSizeMergePolicy}).
+ *
+ * @lucene.experimental
+ */
+
+// TODO
+// - we could try to take into account whether a large
+// merge is already running (under CMS) and then bias
+// ourselves towards picking smaller merges if so (or,
+// maybe CMS should do so)
+
+public class TieredMergePolicy extends MergePolicy {
+
+ private int maxMergeAtOnce = 10;
+ private long maxMergedSegmentBytes = 5*1024*1024*1024L;
+ private int maxMergeAtOnceExplicit = 30;
+
+ private long floorSegmentBytes = 2*1024*1024L;
+ private double segsPerTier = 10.0;
+ private double forceMergeDeletesPctAllowed = 10.0;
+ private boolean useCompoundFile = true;
+ private double noCFSRatio = 0.1;
+ private double reclaimDeletesWeight = 2.0;
+
+ /** Maximum number of segments to be merged at a time
+ * during "normal" merging. For explicit merging (eg,
+ * forceMerge or forceMergeDeletes was called), see {@link
+ * #setMaxMergeAtOnceExplicit}. Default is 10. */
+ public TieredMergePolicy setMaxMergeAtOnce(int v) {
+ if (v < 2) {
+ throw new IllegalArgumentException("maxMergeAtOnce must be > 1 (got " + v + ")");
+ }
+ maxMergeAtOnce = v;
+ return this;
+ }
+
+ /** @see #setMaxMergeAtOnce */
+ public int getMaxMergeAtOnce() {
+ return maxMergeAtOnce;
+ }
+
+ // TODO: should addIndexes do explicit merging, too? And,
+ // if user calls IW.maybeMerge "explicitly"
+
+ /** Maximum number of segments to be merged at a time,
+ * during forceMerge or forceMergeDeletes. Default is 30. */
+ public TieredMergePolicy setMaxMergeAtOnceExplicit(int v) {
+ if (v < 2) {
+ throw new IllegalArgumentException("maxMergeAtOnceExplicit must be > 1 (got " + v + ")");
+ }
+ maxMergeAtOnceExplicit = v;
+ return this;
+ }
+
+ /** @see #setMaxMergeAtOnceExplicit */
+ public int getMaxMergeAtOnceExplicit() {
+ return maxMergeAtOnceExplicit;
+ }
+
+ /** Maximum sized segment to produce during
+ * normal merging. This setting is approximate: the
+ * estimate of the merged segment size is made by summing
+ * sizes of to-be-merged segments (compensating for
+ * percent deleted docs). Default is 5 GB. */
+ public TieredMergePolicy setMaxMergedSegmentMB(double v) {
+ maxMergedSegmentBytes = (long) (v*1024*1024);
+ return this;
+ }
+
+ /** @see #getMaxMergedSegmentMB */
+ public double getMaxMergedSegmentMB() {
+ return maxMergedSegmentBytes/1024/1024.;
+ }
+
+ /** Controls how aggressively merges that reclaim more
+ * deletions are favored. Higher values favor selecting
+ * merges that reclaim deletions. A value of 0.0 means
+ * deletions don't impact merge selection. */
+ public TieredMergePolicy setReclaimDeletesWeight(double v) {
+ if (v < 0.0) {
+ throw new IllegalArgumentException("reclaimDeletesWeight must be >= 0.0 (got " + v + ")");
+ }
+ reclaimDeletesWeight = v;
+ return this;
+ }
+
+ /** See {@link #setReclaimDeletesWeight}. */
+ public double getReclaimDeletesWeight() {
+ return reclaimDeletesWeight;
+ }
+
+ /** Segments smaller than this are "rounded up" to this
+ * size, ie treated as equal (floor) size for merge
+ * selection. This is to prevent frequent flushing of
+ * tiny segments from allowing a long tail in the index.
+ * Default is 2 MB. */
+ public TieredMergePolicy setFloorSegmentMB(double v) {
+ if (v <= 0.0) {
+ throw new IllegalArgumentException("floorSegmentMB must be >= 0.0 (got " + v + ")");
+ }
+ floorSegmentBytes = (long) (v*1024*1024);
+ return this;
+ }
+
+ /** @see #setFloorSegmentMB */
+ public double getFloorSegmentMB() {
+ return floorSegmentBytes/1024*1024.;
+ }
+
+ /** When forceMergeDeletes is called, we only merge away a
+ * segment if its delete percentage is over this
+ * threshold. Default is 10%. */
+ public TieredMergePolicy setForceMergeDeletesPctAllowed(double v) {
+ if (v < 0.0 || v > 100.0) {
+ throw new IllegalArgumentException("forceMergeDeletesPctAllowed must be between 0.0 and 100.0 inclusive (got " + v + ")");
+ }
+ forceMergeDeletesPctAllowed = v;
+ return this;
+ }
+
+ /** @see #setForceMergeDeletesPctAllowed */
+ public double getForceMergeDeletesPctAllowed() {
+ return forceMergeDeletesPctAllowed;
+ }
+
+ /** Sets the allowed number of segments per tier. Smaller
+ * values mean more merging but fewer segments.
+ *
+ *
NOTE: this value should be >= the {@link
+ * #setMaxMergeAtOnce} otherwise you'll force too much
+ * merging to occur.
+ *
+ * Default is 10.0.
*/
+ public TieredMergePolicy setSegmentsPerTier(double v) {
+ if (v < 2.0) {
+ throw new IllegalArgumentException("segmentsPerTier must be >= 2.0 (got " + v + ")");
+ }
+ segsPerTier = v;
+ return this;
+ }
+
+ /** @see #setSegmentsPerTier */
+ public double getSegmentsPerTier() {
+ return segsPerTier;
+ }
+
+ /** Sets whether compound file format should be used for
+ * newly flushed and newly merged segments. Default
+ * true. */
+ public TieredMergePolicy setUseCompoundFile(boolean useCompoundFile) {
+ this.useCompoundFile = useCompoundFile;
+ return this;
+ }
+
+ /** @see #setUseCompoundFile */
+ public boolean getUseCompoundFile() {
+ return useCompoundFile;
+ }
+
+ /** If a merged segment will be more than this percentage
+ * of the total size of the index, leave the segment as
+ * non-compound file even if compound file is enabled.
+ * Set to 1.0 to always use CFS regardless of merge
+ * size. Default is 0.1. */
+ public TieredMergePolicy setNoCFSRatio(double noCFSRatio) {
+ if (noCFSRatio < 0.0 || noCFSRatio > 1.0) {
+ throw new IllegalArgumentException("noCFSRatio must be 0.0 to 1.0 inclusive; got " + noCFSRatio);
+ }
+ this.noCFSRatio = noCFSRatio;
+ return this;
+ }
+
+ /** @see #setNoCFSRatio */
+ public double getNoCFSRatio() {
+ return noCFSRatio;
+ }
+
+ private class SegmentByteSizeDescending implements Comparator {
+ public int compare(SegmentInfo o1, SegmentInfo o2) {
+ try {
+ final long sz1 = size(o1);
+ final long sz2 = size(o2);
+ if (sz1 > sz2) {
+ return -1;
+ } else if (sz2 > sz1) {
+ return 1;
+ } else {
+ return o1.name.compareTo(o2.name);
+ }
+ } catch (IOException ioe) {
+ throw new RuntimeException(ioe);
+ }
+ }
+ }
+
+ private final Comparator segmentByteSizeDescending = new SegmentByteSizeDescending();
+
+ protected static abstract class MergeScore {
+ abstract double getScore();
+ abstract String getExplanation();
+ }
+
+ @Override
+ public MergeSpecification findMerges(SegmentInfos infos) throws IOException {
+ if (verbose()) {
+ message("findMerges: " + infos.size() + " segments");
+ }
+ if (infos.size() == 0) {
+ return null;
+ }
+ final Collection merging = writer.get().getMergingSegments();
+ final Collection toBeMerged = new HashSet();
+
+ final List infosSorted = new ArrayList(infos.asList());
+ Collections.sort(infosSorted, segmentByteSizeDescending);
+
+ // Compute total index bytes & print details about the index
+ long totIndexBytes = 0;
+ long minSegmentBytes = Long.MAX_VALUE;
+ for(SegmentInfo info : infosSorted) {
+ final long segBytes = size(info);
+ if (verbose()) {
+ String extra = merging.contains(info) ? " [merging]" : "";
+ if (segBytes >= maxMergedSegmentBytes/2.0) {
+ extra += " [skip: too large]";
+ } else if (segBytes < floorSegmentBytes) {
+ extra += " [floored]";
+ }
+ message(" seg=" + writer.get().segString(info) + " size=" + String.format("%.3f", segBytes/1024/1024.) + " MB" + extra);
+ }
+
+ minSegmentBytes = Math.min(segBytes, minSegmentBytes);
+ // Accum total byte size
+ totIndexBytes += segBytes;
+ }
+
+ // If we have too-large segments, grace them out
+ // of the maxSegmentCount:
+ int tooBigCount = 0;
+ while (tooBigCount < infosSorted.size() && size(infosSorted.get(tooBigCount)) >= maxMergedSegmentBytes/2.0) {
+ totIndexBytes -= size(infosSorted.get(tooBigCount));
+ tooBigCount++;
+ }
+
+ minSegmentBytes = floorSize(minSegmentBytes);
+
+ // Compute max allowed segs in the index
+ long levelSize = minSegmentBytes;
+ long bytesLeft = totIndexBytes;
+ double allowedSegCount = 0;
+ while(true) {
+ final double segCountLevel = bytesLeft / (double) levelSize;
+ if (segCountLevel < segsPerTier) {
+ allowedSegCount += Math.ceil(segCountLevel);
+ break;
+ }
+ allowedSegCount += segsPerTier;
+ bytesLeft -= segsPerTier * levelSize;
+ levelSize *= maxMergeAtOnce;
+ }
+ int allowedSegCountInt = (int) allowedSegCount;
+
+ MergeSpecification spec = null;
+
+ // Cycle to possibly select more than one merge:
+ while(true) {
+
+ long mergingBytes = 0;
+
+ // Gather eligible segments for merging, ie segments
+ // not already being merged and not already picked (by
+ // prior iteration of this loop) for merging:
+ final List eligible = new ArrayList();
+ for(int idx = tooBigCount; idx= maxMergedSegmentBytes;
+
+ message(" allowedSegmentCount=" + allowedSegCountInt + " vs count=" + infosSorted.size() + " (eligible count=" + eligible.size() + ") tooBigCount=" + tooBigCount);
+
+ if (eligible.size() == 0) {
+ return spec;
+ }
+
+ if (eligible.size() >= allowedSegCountInt) {
+
+ // OK we are over budget -- find best merge!
+ MergeScore bestScore = null;
+ List best = null;
+ boolean bestTooLarge = false;
+ long bestMergeBytes = 0;
+
+ // Consider all merge starts:
+ for(int startIdx = 0;startIdx <= eligible.size()-maxMergeAtOnce; startIdx++) {
+
+ long totAfterMergeBytes = 0;
+
+ final List candidate = new ArrayList();
+ boolean hitTooLarge = false;
+ for(int idx = startIdx;idx maxMergedSegmentBytes) {
+ hitTooLarge = true;
+ // NOTE: we continue, so that we can try
+ // "packing" smaller segments into this merge
+ // to see if we can get closer to the max
+ // size; this in general is not perfect since
+ // this is really "bin packing" and we'd have
+ // to try different permutations.
+ continue;
+ }
+ candidate.add(info);
+ totAfterMergeBytes += segBytes;
+ }
+
+ final MergeScore score = score(candidate, hitTooLarge, mergingBytes);
+ message(" maybe=" + writer.get().segString(candidate) + " score=" + score.getScore() + " " + score.getExplanation() + " tooLarge=" + hitTooLarge + " size=" + String.format("%.3f MB", totAfterMergeBytes/1024./1024.));
+
+ // If we are already running a max sized merge
+ // (maxMergeIsRunning), don't allow another max
+ // sized merge to kick off:
+ if ((bestScore == null || score.getScore() < bestScore.getScore()) && (!hitTooLarge || !maxMergeIsRunning)) {
+ best = candidate;
+ bestScore = score;
+ bestTooLarge = hitTooLarge;
+ bestMergeBytes = totAfterMergeBytes;
+ }
+ }
+
+ if (best != null) {
+ if (spec == null) {
+ spec = new MergeSpecification();
+ }
+ final OneMerge merge = new OneMerge(best);
+ spec.add(merge);
+ for(SegmentInfo info : merge.segments) {
+ toBeMerged.add(info);
+ }
+
+ if (verbose()) {
+ message(" add merge=" + writer.get().segString(merge.segments) + " size=" + String.format("%.3f MB", bestMergeBytes/1024./1024.) + " score=" + String.format("%.3f", bestScore.getScore()) + " " + bestScore.getExplanation() + (bestTooLarge ? " [max merge]" : ""));
+ }
+ } else {
+ return spec;
+ }
+ } else {
+ return spec;
+ }
+ }
+ }
+
+ /** Expert: scores one merge; subclasses can override. */
+ protected MergeScore score(List candidate, boolean hitTooLarge, long mergingBytes) throws IOException {
+ long totBeforeMergeBytes = 0;
+ long totAfterMergeBytes = 0;
+ long totAfterMergeBytesFloored = 0;
+ for(SegmentInfo info : candidate) {
+ final long segBytes = size(info);
+ totAfterMergeBytes += segBytes;
+ totAfterMergeBytesFloored += floorSize(segBytes);
+ totBeforeMergeBytes += info.sizeInBytes(true);
+ }
+
+ // Measure "skew" of the merge, which can range
+ // from 1.0/numSegsBeingMerged (good) to 1.0
+ // (poor):
+ final double skew;
+ if (hitTooLarge) {
+ // Pretend the merge has perfect skew; skew doesn't
+ // matter in this case because this merge will not
+ // "cascade" and so it cannot lead to N^2 merge cost
+ // over time:
+ skew = 1.0/maxMergeAtOnce;
+ } else {
+ skew = ((double) floorSize(size(candidate.get(0))))/totAfterMergeBytesFloored;
+ }
+
+ // Strongly favor merges with less skew (smaller
+ // mergeScore is better):
+ double mergeScore = skew;
+
+ // Gently favor smaller merges over bigger ones. We
+ // don't want to make this exponent too large else we
+ // can end up doing poor merges of small segments in
+ // order to avoid the large merges:
+ mergeScore *= Math.pow(totAfterMergeBytes, 0.05);
+
+ // Strongly favor merges that reclaim deletes:
+ final double nonDelRatio = ((double) totAfterMergeBytes)/totBeforeMergeBytes;
+ mergeScore *= Math.pow(nonDelRatio, reclaimDeletesWeight);
+
+ final double finalMergeScore = mergeScore;
+
+ return new MergeScore() {
+
+ @Override
+ public double getScore() {
+ return finalMergeScore;
+ }
+
+ @Override
+ public String getExplanation() {
+ return "skew=" + String.format("%.3f", skew) + " nonDelRatio=" + String.format("%.3f", nonDelRatio);
+ }
+ };
+ }
+
+ @Override
+ public MergeSpecification findForcedMerges(SegmentInfos infos, int maxSegmentCount, Map segmentsToMerge) throws IOException {
+ if (verbose()) {
+ message("findForcedMerges maxSegmentCount=" + maxSegmentCount + " infos=" + writer.get().segString(infos) + " segmentsToMerge=" + segmentsToMerge);
+ }
+
+ List eligible = new ArrayList();
+ boolean forceMergeRunning = false;
+ final Collection merging = writer.get().getMergingSegments();
+ boolean segmentIsOriginal = false;
+ for(SegmentInfo info : infos) {
+ final Boolean isOriginal = segmentsToMerge.get(info);
+ if (isOriginal != null) {
+ segmentIsOriginal = isOriginal;
+ if (!merging.contains(info)) {
+ eligible.add(info);
+ } else {
+ forceMergeRunning = true;
+ }
+ }
+ }
+
+ if (eligible.size() == 0) {
+ return null;
+ }
+
+ if ((maxSegmentCount > 1 && eligible.size() <= maxSegmentCount) ||
+ (maxSegmentCount == 1 && eligible.size() == 1 && (!segmentIsOriginal || isMerged(eligible.get(0))))) {
+ if (verbose()) {
+ message("already merged");
+ }
+ return null;
+ }
+
+ Collections.sort(eligible, segmentByteSizeDescending);
+
+ if (verbose()) {
+ message("eligible=" + eligible);
+ message("forceMergeRunning=" + forceMergeRunning);
+ }
+
+ int end = eligible.size();
+
+ MergeSpecification spec = null;
+
+ // Do full merges, first, backwards:
+ while(end >= maxMergeAtOnceExplicit + maxSegmentCount - 1) {
+ if (spec == null) {
+ spec = new MergeSpecification();
+ }
+ final OneMerge merge = new OneMerge(eligible.subList(end-maxMergeAtOnceExplicit, end));
+ if (verbose()) {
+ message("add merge=" + writer.get().segString(merge.segments));
+ }
+ spec.add(merge);
+ end -= maxMergeAtOnceExplicit;
+ }
+
+ if (spec == null && !forceMergeRunning) {
+ // Do final merge
+ final int numToMerge = end - maxSegmentCount + 1;
+ final OneMerge merge = new OneMerge(eligible.subList(end-numToMerge, end));
+ if (verbose()) {
+ message("add final merge=" + merge.segString(writer.get().getDirectory()));
+ }
+ spec = new MergeSpecification();
+ spec.add(merge);
+ }
+
+ return spec;
+ }
+
+ @Override
+ public MergeSpecification findForcedDeletesMerges(SegmentInfos infos)
+ throws CorruptIndexException, IOException {
+ if (verbose()) {
+ message("findForcedDeletesMerges infos=" + writer.get().segString(infos) + " forceMergeDeletesPctAllowed=" + forceMergeDeletesPctAllowed);
+ }
+ final List eligible = new ArrayList();
+ final Collection merging = writer.get().getMergingSegments();
+ for(SegmentInfo info : infos) {
+ double pctDeletes = 100.*((double) writer.get().numDeletedDocs(info))/info.docCount;
+ if (pctDeletes > forceMergeDeletesPctAllowed && !merging.contains(info)) {
+ eligible.add(info);
+ }
+ }
+
+ if (eligible.size() == 0) {
+ return null;
+ }
+
+ Collections.sort(eligible, segmentByteSizeDescending);
+
+ if (verbose()) {
+ message("eligible=" + eligible);
+ }
+
+ int start = 0;
+ MergeSpecification spec = null;
+
+ while(start < eligible.size()) {
+ // Don't enforce max merged size here: app is explicitly
+ // calling forceMergeDeletes, and knows this may take a
+ // long time / produce big segments (like forceMerge):
+ final int end = Math.min(start + maxMergeAtOnceExplicit, eligible.size());
+ if (spec == null) {
+ spec = new MergeSpecification();
+ }
+
+ final OneMerge merge = new OneMerge(eligible.subList(start, end));
+ if (verbose()) {
+ message("add merge=" + writer.get().segString(merge.segments));
+ }
+ spec.add(merge);
+ start = end;
+ }
+
+ return spec;
+ }
+
+ @Override
+ public boolean useCompoundFile(SegmentInfos infos, SegmentInfo mergedInfo) throws IOException {
+ final boolean doCFS;
+
+ if (!useCompoundFile) {
+ doCFS = false;
+ } else if (noCFSRatio == 1.0) {
+ doCFS = true;
+ } else {
+ long totalSize = 0;
+ for (SegmentInfo info : infos)
+ totalSize += size(info);
+
+ doCFS = size(mergedInfo) <= noCFSRatio * totalSize;
+ }
+ return doCFS;
+ }
+
+ @Override
+ public void close() {
+ }
+
+ private boolean isMerged(SegmentInfo info)
+ throws IOException {
+ IndexWriter w = writer.get();
+ assert w != null;
+ boolean hasDeletions = w.numDeletedDocs(info) > 0;
+ return !hasDeletions &&
+ !info.hasSeparateNorms() &&
+ info.dir == w.getDirectory() &&
+ (info.getUseCompoundFile() == useCompoundFile || noCFSRatio < 1.0);
+ }
+
+ // Segment size in bytes, pro-rated by % deleted
+ private long size(SegmentInfo info) throws IOException {
+ final long byteSize = info.sizeInBytes(true);
+ final int delCount = writer.get().numDeletedDocs(info);
+ final double delRatio = (info.docCount <= 0 ? 0.0f : ((double)delCount / (double)info.docCount));
+ assert delRatio <= 1.0;
+ return (long) (byteSize * (1.0-delRatio));
+ }
+
+ private long floorSize(long bytes) {
+ return Math.max(floorSegmentBytes, bytes);
+ }
+
+ private boolean verbose() {
+ IndexWriter w = writer.get();
+ return w != null && w.verbose();
+ }
+
+ private void message(String message) {
+ if (verbose()) {
+ writer.get().message("TMP: " + message);
+ }
+ }
+
+ @Override
+ public String toString() {
+ StringBuilder sb = new StringBuilder("[" + getClass().getSimpleName() + ": ");
+ sb.append("maxMergeAtOnce=").append(maxMergeAtOnce).append(", ");
+ sb.append("maxMergeAtOnceExplicit=").append(maxMergeAtOnceExplicit).append(", ");
+ sb.append("maxMergedSegmentMB=").append(maxMergedSegmentBytes/1024/1024.).append(", ");
+ sb.append("floorSegmentMB=").append(floorSegmentBytes/1024/1024.).append(", ");
+ sb.append("forceMergeDeletesPctAllowed=").append(forceMergeDeletesPctAllowed).append(", ");
+ sb.append("segmentsPerTier=").append(segsPerTier).append(", ");
+ sb.append("useCompoundFile=").append(useCompoundFile).append(", ");
+ sb.append("noCFSRatio=").append(noCFSRatio);
+ return sb.toString();
+ }
+}