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/*
* Licensed to Elasticsearch 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.scheduler;
import org.apache.lucene.index.*;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.logging.ESLogger;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.util.concurrent.EsExecutors;
import org.elasticsearch.index.merge.MergeStats;
import org.elasticsearch.index.merge.OnGoingMerge;
import org.elasticsearch.index.settings.IndexSettings;
import org.elasticsearch.index.shard.ShardId;
import org.elasticsearch.threadpool.ThreadPool;
import com.google.common.collect.ImmutableSet;
import java.io.IOException;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArraySet;
/**
* @deprecated This provider just provides ConcurrentMergeScheduler, and is removed in master.
*/
@Deprecated
public class SerialMergeSchedulerProvider extends MergeSchedulerProvider {
public static final int DEFAULT_MAX_MERGE_AT_ONCE = 5;
private Set schedulers = new CopyOnWriteArraySet<>();
@Inject
public SerialMergeSchedulerProvider(ShardId shardId, @IndexSettings Settings indexSettings, ThreadPool threadPool) {
super(shardId, indexSettings, threadPool);
Integer value = componentSettings.getAsInt("max_merge_at_once", null);
if (value != null) {
logger.warn("ignoring index.merge.scheduler.max_merge_at_once [{}], because we are using ConcurrentMergeScheduler(2, 1)", value);
}
logger.trace("using [concurrent] merge scheduler, max_thread_count=1, max_merge_count=2");
}
@Override
public int getMaxMerges() {
return 1;
}
@Override
public MergeScheduler buildMergeScheduler() {
CustomSerialMergeScheduler scheduler = new CustomSerialMergeScheduler(logger, shardId, this);
scheduler.setMaxMergesAndThreads(2, 1); // we add max merge count = 2 to make sure we stall once a second merge comes in.
schedulers.add(scheduler);
return scheduler;
}
@Override
public MergeStats stats() {
MergeStats mergeStats = new MergeStats();
for (CustomSerialMergeScheduler scheduler : schedulers) {
mergeStats.add(scheduler.totalMerges(), scheduler.totalMergeTime(), scheduler.totalMergeNumDocs(), scheduler.totalMergeSizeInBytes(),
scheduler.currentMerges(), scheduler.currentMergesNumDocs(), scheduler.currentMergesSizeInBytes());
}
return mergeStats;
}
@Override
public Set onGoingMerges() {
for (CustomSerialMergeScheduler scheduler : schedulers) {
return scheduler.onGoingMerges();
}
return ImmutableSet.of();
}
@Override
public void close() {
}
/** NOTE: subclasses TrackingCONCURRENTMergeScheduler, but we set max_merge_count = 2 and max_thread_count = 1, above */
public static class CustomSerialMergeScheduler extends TrackingConcurrentMergeScheduler {
private final ShardId shardId;
private final SerialMergeSchedulerProvider provider;
private CustomSerialMergeScheduler(ESLogger logger, ShardId shardId, SerialMergeSchedulerProvider provider) {
super(logger);
this.shardId = shardId;
this.provider = provider;
}
@Override
protected MergeThread getMergeThread(IndexWriter writer, MergePolicy.OneMerge merge) throws IOException {
MergeThread thread = super.getMergeThread(writer, merge);
thread.setName(EsExecutors.threadName(provider.indexSettings(), "[" + shardId.index().name() + "][" + shardId.id() + "]: " + thread.getName()));
return thread;
}
@Override
protected void handleMergeException(Throwable exc) {
logger.warn("failed to merge", exc);
provider.failedMerge(new MergePolicy.MergeException(exc, dir));
super.handleMergeException(exc);
}
@Override
public void close() {
super.close();
provider.schedulers.remove(this);
}
@Override
protected void beforeMerge(OnGoingMerge merge) {
super.beforeMerge(merge);
provider.beforeMerge(merge);
}
@Override
protected void afterMerge(OnGoingMerge merge) {
super.afterMerge(merge);
provider.afterMerge(merge);
}
}
}