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/*
* Licensed to ElasticSearch and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. ElasticSearch 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.
*/
package org.elasticsearch.index.merge.policy;
import org.apache.lucene.index.LogByteSizeMergePolicy;
import org.apache.lucene.index.MergePolicy;
import org.apache.lucene.index.SegmentInfos;
import org.elasticsearch.ElasticSearchException;
import org.elasticsearch.common.Preconditions;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.unit.ByteSizeUnit;
import org.elasticsearch.common.unit.ByteSizeValue;
import org.elasticsearch.index.settings.IndexSettingsService;
import org.elasticsearch.index.store.Store;
import java.io.IOException;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArraySet;
/**
*
*/
public class LogByteSizeMergePolicyProvider extends AbstractMergePolicyProvider {
private final IndexSettingsService indexSettingsService;
private volatile ByteSizeValue minMergeSize;
private volatile ByteSizeValue maxMergeSize;
private volatile int mergeFactor;
private volatile int maxMergeDocs;
private final boolean calibrateSizeByDeletes;
private boolean asyncMerge;
private final Set policies = new CopyOnWriteArraySet();
private final ApplySettings applySettings = new ApplySettings();
@Inject
public LogByteSizeMergePolicyProvider(Store store, IndexSettingsService indexSettingsService) {
super(store);
Preconditions.checkNotNull(store, "Store must be provided to merge policy");
this.indexSettingsService = indexSettingsService;
this.minMergeSize = componentSettings.getAsBytesSize("min_merge_size", new ByteSizeValue((long) (LogByteSizeMergePolicy.DEFAULT_MIN_MERGE_MB * 1024 * 1024), ByteSizeUnit.BYTES));
this.maxMergeSize = componentSettings.getAsBytesSize("max_merge_size", new ByteSizeValue((long) LogByteSizeMergePolicy.DEFAULT_MAX_MERGE_MB, ByteSizeUnit.MB));
this.mergeFactor = componentSettings.getAsInt("merge_factor", LogByteSizeMergePolicy.DEFAULT_MERGE_FACTOR);
this.maxMergeDocs = componentSettings.getAsInt("max_merge_docs", LogByteSizeMergePolicy.DEFAULT_MAX_MERGE_DOCS);
this.calibrateSizeByDeletes = componentSettings.getAsBoolean("calibrate_size_by_deletes", true);
this.asyncMerge = indexSettings.getAsBoolean("index.merge.async", true);
logger.debug("using [log_bytes_size] merge policy with merge_factor[{}], min_merge_size[{}], max_merge_size[{}], max_merge_docs[{}], calibrate_size_by_deletes[{}], async_merge[{}]",
mergeFactor, minMergeSize, maxMergeSize, maxMergeDocs, calibrateSizeByDeletes, asyncMerge);
indexSettingsService.addListener(applySettings);
}
@Override
public LogByteSizeMergePolicy newMergePolicy() {
CustomLogByteSizeMergePolicy mergePolicy;
if (asyncMerge) {
mergePolicy = new EnableMergeLogByteSizeMergePolicy(this);
} else {
mergePolicy = new CustomLogByteSizeMergePolicy(this);
}
mergePolicy.setMinMergeMB(minMergeSize.mbFrac());
mergePolicy.setMaxMergeMB(maxMergeSize.mbFrac());
mergePolicy.setMergeFactor(mergeFactor);
mergePolicy.setMaxMergeDocs(maxMergeDocs);
mergePolicy.setCalibrateSizeByDeletes(calibrateSizeByDeletes);
mergePolicy.setUseCompoundFile(compoundFormat);
mergePolicy.setNoCFSRatio(noCFSRatio);
policies.add(mergePolicy);
return mergePolicy;
}
@Override
public void close() throws ElasticSearchException {
indexSettingsService.removeListener(applySettings);
}
public static final String INDEX_MERGE_POLICY_MIN_MERGE_SIZE = "index.merge.policy.min_merge_size";
public static final String INDEX_MERGE_POLICY_MAX_MERGE_SIZE = "index.merge.policy.max_merge_size";
public static final String INDEX_MERGE_POLICY_MAX_MERGE_DOCS = "index.merge.policy.max_merge_docs";
public static final String INDEX_MERGE_POLICY_MERGE_FACTOR = "index.merge.policy.merge_factor";
class ApplySettings implements IndexSettingsService.Listener {
@Override
public void onRefreshSettings(Settings settings) {
ByteSizeValue minMergeSize = settings.getAsBytesSize(INDEX_MERGE_POLICY_MIN_MERGE_SIZE, LogByteSizeMergePolicyProvider.this.minMergeSize);
if (!minMergeSize.equals(LogByteSizeMergePolicyProvider.this.minMergeSize)) {
logger.info("updating min_merge_size from [{}] to [{}]", LogByteSizeMergePolicyProvider.this.minMergeSize, minMergeSize);
LogByteSizeMergePolicyProvider.this.minMergeSize = minMergeSize;
for (CustomLogByteSizeMergePolicy policy : policies) {
policy.setMinMergeMB(minMergeSize.mbFrac());
}
}
ByteSizeValue maxMergeSize = settings.getAsBytesSize(INDEX_MERGE_POLICY_MAX_MERGE_SIZE, LogByteSizeMergePolicyProvider.this.maxMergeSize);
if (!maxMergeSize.equals(LogByteSizeMergePolicyProvider.this.maxMergeSize)) {
logger.info("updating max_merge_size from [{}] to [{}]", LogByteSizeMergePolicyProvider.this.maxMergeSize, maxMergeSize);
LogByteSizeMergePolicyProvider.this.maxMergeSize = maxMergeSize;
for (CustomLogByteSizeMergePolicy policy : policies) {
policy.setMaxMergeMB(maxMergeSize.mbFrac());
}
}
int maxMergeDocs = settings.getAsInt(INDEX_MERGE_POLICY_MAX_MERGE_DOCS, LogByteSizeMergePolicyProvider.this.maxMergeDocs);
if (maxMergeDocs != LogByteSizeMergePolicyProvider.this.maxMergeDocs) {
logger.info("updating max_merge_docs from [{}] to [{}]", LogByteSizeMergePolicyProvider.this.maxMergeDocs, maxMergeDocs);
LogByteSizeMergePolicyProvider.this.maxMergeDocs = maxMergeDocs;
for (CustomLogByteSizeMergePolicy policy : policies) {
policy.setMaxMergeDocs(maxMergeDocs);
}
}
int mergeFactor = settings.getAsInt(INDEX_MERGE_POLICY_MERGE_FACTOR, LogByteSizeMergePolicyProvider.this.mergeFactor);
if (mergeFactor != LogByteSizeMergePolicyProvider.this.mergeFactor) {
logger.info("updating merge_factor from [{}] to [{}]", LogByteSizeMergePolicyProvider.this.mergeFactor, mergeFactor);
LogByteSizeMergePolicyProvider.this.mergeFactor = mergeFactor;
for (CustomLogByteSizeMergePolicy policy : policies) {
policy.setMergeFactor(mergeFactor);
}
}
final double noCFSRatio = parseNoCFSRatio(settings.get(INDEX_COMPOUND_FORMAT, Double.toString(LogByteSizeMergePolicyProvider.this.noCFSRatio)));
final boolean compoundFormat = noCFSRatio != 0.0;
if (noCFSRatio != LogByteSizeMergePolicyProvider.this.noCFSRatio) {
logger.info("updating index.compound_format from [{}] to [{}]", formatNoCFSRatio(LogByteSizeMergePolicyProvider.this.noCFSRatio), formatNoCFSRatio(noCFSRatio));
LogByteSizeMergePolicyProvider.this.compoundFormat = compoundFormat;
LogByteSizeMergePolicyProvider.this.noCFSRatio = noCFSRatio;
for (CustomLogByteSizeMergePolicy policy : policies) {
policy.setNoCFSRatio(noCFSRatio);
policy.setUseCompoundFile(compoundFormat);
}
}
}
}
public static class CustomLogByteSizeMergePolicy extends LogByteSizeMergePolicy {
private final LogByteSizeMergePolicyProvider provider;
public CustomLogByteSizeMergePolicy(LogByteSizeMergePolicyProvider provider) {
super();
this.provider = provider;
}
@Override
public void close() {
super.close();
provider.policies.remove(this);
}
@Override
public MergePolicy clone() {
// Lucene IW makes a clone internally but since we hold on to this instance
// the clone will just be the identity.
return this;
}
}
public static class EnableMergeLogByteSizeMergePolicy extends CustomLogByteSizeMergePolicy {
public EnableMergeLogByteSizeMergePolicy(LogByteSizeMergePolicyProvider provider) {
super(provider);
}
@Override
public MergeSpecification findMerges(MergeTrigger trigger, SegmentInfos infos) throws IOException {
// we don't enable merges while indexing documents, we do them in the background
if (trigger == MergeTrigger.SEGMENT_FLUSH) {
return null;
}
return super.findMerges(trigger, infos);
}
}
}
