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Elasticsearch subproject :server
/*
* Licensed to Elastic Search and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Elastic Search 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.translog;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.index.engine.Engine;
import org.elasticsearch.index.engine.EngineClosedException;
import org.elasticsearch.index.engine.FlushNotAllowedEngineException;
import org.elasticsearch.index.settings.IndexSettings;
import org.elasticsearch.index.shard.AbstractIndexShardComponent;
import org.elasticsearch.index.shard.IndexShardState;
import org.elasticsearch.index.shard.ShardId;
import org.elasticsearch.index.shard.service.IndexShard;
import org.elasticsearch.threadpool.ThreadPool;
import java.util.concurrent.ScheduledFuture;
import static org.elasticsearch.common.unit.TimeValue.*;
/**
* @author kimchy (shay.banon)
*/
public class TranslogService extends AbstractIndexShardComponent {
private final ThreadPool threadPool;
private final IndexShard indexShard;
private final Translog translog;
private final int flushThreshold;
private final TimeValue interval;
private ScheduledFuture future;
@Inject public TranslogService(ShardId shardId, @IndexSettings Settings indexSettings, ThreadPool threadPool, IndexShard indexShard, Translog translog) {
super(shardId, indexSettings);
this.threadPool = threadPool;
this.indexShard = indexShard;
this.translog = translog;
this.flushThreshold = componentSettings.getAsInt("flush_threshold", 5000);
this.interval = componentSettings.getAsTime("interval", timeValueMillis(1000));
this.future = threadPool.scheduleWithFixedDelay(new TranslogBasedFlush(), interval);
}
public void close() {
this.future.cancel(true);
}
private class TranslogBasedFlush implements Runnable {
@Override public void run() {
if (indexShard.state() != IndexShardState.STARTED) {
return;
}
int currentSize = translog.size();
if (currentSize > flushThreshold) {
logger.trace("flushing translog, operations [{}], breached [{}]", currentSize, flushThreshold);
try {
indexShard.flush(new Engine.Flush());
} catch (EngineClosedException e) {
// we are being closed, ignore
} catch (FlushNotAllowedEngineException e) {
// ignore this exception, we are not allowed to perform flush
} catch (Exception e) {
logger.warn("failed to flush shard on translog threshold", e);
}
}
}
}
}