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/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0 and the Server Side Public License, v 1; you may not use this file except
* in compliance with, at your election, the Elastic License 2.0 or the Server
* Side Public License, v 1.
*/
package org.elasticsearch.index;
import org.apache.lucene.index.FilterMergePolicy;
import org.apache.lucene.index.SegmentCommitInfo;
import org.apache.lucene.index.SegmentInfos;
import org.apache.lucene.index.TieredMergePolicy;
import java.io.IOException;
import java.util.Map;
/**
* Wrapper around {@link TieredMergePolicy} which doesn't respect
* {@link TieredMergePolicy#setMaxMergedSegmentMB(double)} on forced merges.
* See https://issues.apache.org/jira/browse/LUCENE-7976.
*/
final class EsTieredMergePolicy extends FilterMergePolicy {
final TieredMergePolicy regularMergePolicy;
final TieredMergePolicy forcedMergePolicy;
EsTieredMergePolicy() {
super(new TieredMergePolicy());
regularMergePolicy = (TieredMergePolicy) in;
forcedMergePolicy = new TieredMergePolicy();
forcedMergePolicy.setMaxMergedSegmentMB(Double.POSITIVE_INFINITY); // unlimited
}
@Override
public MergeSpecification findForcedMerges(
SegmentInfos infos,
int maxSegmentCount,
Map segmentsToMerge,
MergeContext mergeContext
) throws IOException {
return forcedMergePolicy.findForcedMerges(infos, maxSegmentCount, segmentsToMerge, mergeContext);
}
@Override
public MergeSpecification findForcedDeletesMerges(SegmentInfos infos, MergeContext mergeContext) throws IOException {
// we apply the max segment size through the regular merge policy in
// order to avoid giant segments when expunging deletes on a read/write index
return regularMergePolicy.findForcedDeletesMerges(infos, mergeContext);
}
public void setForceMergeDeletesPctAllowed(double forceMergeDeletesPctAllowed) {
regularMergePolicy.setForceMergeDeletesPctAllowed(forceMergeDeletesPctAllowed);
forcedMergePolicy.setForceMergeDeletesPctAllowed(forceMergeDeletesPctAllowed);
}
public double getForceMergeDeletesPctAllowed() {
return forcedMergePolicy.getForceMergeDeletesPctAllowed();
}
public void setFloorSegmentMB(double mbFrac) {
regularMergePolicy.setFloorSegmentMB(mbFrac);
forcedMergePolicy.setFloorSegmentMB(mbFrac);
}
public double getFloorSegmentMB() {
return regularMergePolicy.getFloorSegmentMB();
}
public void setMaxMergeAtOnce(int maxMergeAtOnce) {
regularMergePolicy.setMaxMergeAtOnce(maxMergeAtOnce);
forcedMergePolicy.setMaxMergeAtOnce(maxMergeAtOnce);
}
public int getMaxMergeAtOnce() {
return regularMergePolicy.getMaxMergeAtOnce();
}
public void setMaxMergeAtOnceExplicit(int maxMergeAtOnceExplicit) {
regularMergePolicy.setMaxMergeAtOnceExplicit(maxMergeAtOnceExplicit);
forcedMergePolicy.setMaxMergeAtOnceExplicit(maxMergeAtOnceExplicit);
}
public int getMaxMergeAtOnceExplicit() {
return forcedMergePolicy.getMaxMergeAtOnceExplicit();
}
// only setter that must NOT delegate to the forced merge policy
public void setMaxMergedSegmentMB(double mbFrac) {
regularMergePolicy.setMaxMergedSegmentMB(mbFrac);
}
public double getMaxMergedSegmentMB() {
return regularMergePolicy.getMaxMergedSegmentMB();
}
public void setSegmentsPerTier(double segmentsPerTier) {
regularMergePolicy.setSegmentsPerTier(segmentsPerTier);
forcedMergePolicy.setSegmentsPerTier(segmentsPerTier);
}
public double getSegmentsPerTier() {
return regularMergePolicy.getSegmentsPerTier();
}
public void setDeletesPctAllowed(double deletesPctAllowed) {
regularMergePolicy.setDeletesPctAllowed(deletesPctAllowed);
forcedMergePolicy.setDeletesPctAllowed(deletesPctAllowed);
}
public double getDeletesPctAllowed() {
return regularMergePolicy.getDeletesPctAllowed();
}
}