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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.translog;
import org.elasticsearch.action.admin.indices.flush.FlushRequest;
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.common.unit.TimeValue;
import org.elasticsearch.common.util.concurrent.FutureUtils;
import org.elasticsearch.index.engine.FlushNotAllowedEngineException;
import org.elasticsearch.index.settings.IndexSettings;
import org.elasticsearch.index.settings.IndexSettingsService;
import org.elasticsearch.index.shard.AbstractIndexShardComponent;
import org.elasticsearch.index.shard.IllegalIndexShardStateException;
import org.elasticsearch.index.shard.IndexShardState;
import org.elasticsearch.index.shard.ShardId;
import org.elasticsearch.index.shard.IndexShard;
import org.elasticsearch.threadpool.ThreadPool;
import java.io.Closeable;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.ThreadLocalRandom;
import static org.elasticsearch.common.unit.TimeValue.timeValueMillis;
/**
*
*/
public class TranslogService extends AbstractIndexShardComponent implements Closeable {
private static final String FLUSH_THRESHOLD_OPS_KEY = "flush_threshold_ops";
private static final String FLUSH_THRESHOLD_SIZE_KEY = "flush_threshold_size";
private static final String FLUSH_THRESHOLD_PERIOD_KEY = "flush_threshold_period";
private static final String FLUSH_THRESHOLD_DISABLE_FLUSH_KEY = "disable_flush";
private static final String FLUSH_THRESHOLD_INTERVAL_KEY = "interval";
public static final String INDEX_TRANSLOG_FLUSH_INTERVAL = "index.translog." + FLUSH_THRESHOLD_INTERVAL_KEY;
public static final String INDEX_TRANSLOG_FLUSH_THRESHOLD_OPS = "index.translog." + FLUSH_THRESHOLD_OPS_KEY;
public static final String INDEX_TRANSLOG_FLUSH_THRESHOLD_SIZE = "index.translog." + FLUSH_THRESHOLD_SIZE_KEY;
public static final String INDEX_TRANSLOG_FLUSH_THRESHOLD_PERIOD = "index.translog." + FLUSH_THRESHOLD_PERIOD_KEY;
public static final String INDEX_TRANSLOG_DISABLE_FLUSH = "index.translog." + FLUSH_THRESHOLD_DISABLE_FLUSH_KEY;
private final ThreadPool threadPool;
private final IndexSettingsService indexSettingsService;
private final IndexShard indexShard;
private final Translog translog;
private volatile TimeValue interval;
private volatile int flushThresholdOperations;
private volatile ByteSizeValue flushThresholdSize;
private volatile TimeValue flushThresholdPeriod;
private volatile boolean disableFlush;
private volatile ScheduledFuture future;
private final ApplySettings applySettings = new ApplySettings();
@Inject
public TranslogService(ShardId shardId, @IndexSettings Settings indexSettings, IndexSettingsService indexSettingsService, ThreadPool threadPool, IndexShard indexShard, Translog translog) {
super(shardId, indexSettings);
this.threadPool = threadPool;
this.indexSettingsService = indexSettingsService;
this.indexShard = indexShard;
this.translog = translog;
this.flushThresholdOperations = componentSettings.getAsInt(FLUSH_THRESHOLD_OPS_KEY, componentSettings.getAsInt("flush_threshold", Integer.MAX_VALUE));
this.flushThresholdSize = componentSettings.getAsBytesSize(FLUSH_THRESHOLD_SIZE_KEY, new ByteSizeValue(512, ByteSizeUnit.MB));
this.flushThresholdPeriod = componentSettings.getAsTime(FLUSH_THRESHOLD_PERIOD_KEY, TimeValue.timeValueMinutes(30));
this.interval = componentSettings.getAsTime(FLUSH_THRESHOLD_INTERVAL_KEY, timeValueMillis(5000));
this.disableFlush = componentSettings.getAsBoolean(FLUSH_THRESHOLD_DISABLE_FLUSH_KEY, false);
logger.debug("interval [{}], flush_threshold_ops [{}], flush_threshold_size [{}], flush_threshold_period [{}]", interval, flushThresholdOperations, flushThresholdSize, flushThresholdPeriod);
this.future = threadPool.schedule(interval, ThreadPool.Names.SAME, new TranslogBasedFlush());
indexSettingsService.addListener(applySettings);
}
public void close() {
indexSettingsService.removeListener(applySettings);
FutureUtils.cancel(this.future);
}
class ApplySettings implements IndexSettingsService.Listener {
@Override
public void onRefreshSettings(Settings settings) {
int flushThresholdOperations = settings.getAsInt(INDEX_TRANSLOG_FLUSH_THRESHOLD_OPS, TranslogService.this.flushThresholdOperations);
if (flushThresholdOperations != TranslogService.this.flushThresholdOperations) {
logger.info("updating flush_threshold_ops from [{}] to [{}]", TranslogService.this.flushThresholdOperations, flushThresholdOperations);
TranslogService.this.flushThresholdOperations = flushThresholdOperations;
}
ByteSizeValue flushThresholdSize = settings.getAsBytesSize(INDEX_TRANSLOG_FLUSH_THRESHOLD_SIZE, TranslogService.this.flushThresholdSize);
if (!flushThresholdSize.equals(TranslogService.this.flushThresholdSize)) {
logger.info("updating flush_threshold_size from [{}] to [{}]", TranslogService.this.flushThresholdSize, flushThresholdSize);
TranslogService.this.flushThresholdSize = flushThresholdSize;
}
TimeValue flushThresholdPeriod = settings.getAsTime(INDEX_TRANSLOG_FLUSH_THRESHOLD_PERIOD, TranslogService.this.flushThresholdPeriod);
if (!flushThresholdPeriod.equals(TranslogService.this.flushThresholdPeriod)) {
logger.info("updating flush_threshold_period from [{}] to [{}]", TranslogService.this.flushThresholdPeriod, flushThresholdPeriod);
TranslogService.this.flushThresholdPeriod = flushThresholdPeriod;
}
TimeValue interval = settings.getAsTime(INDEX_TRANSLOG_FLUSH_INTERVAL, TranslogService.this.interval);
if (!interval.equals(TranslogService.this.interval)) {
logger.info("updating interval from [{}] to [{}]", TranslogService.this.interval, interval);
TranslogService.this.interval = interval;
}
boolean disableFlush = settings.getAsBoolean(INDEX_TRANSLOG_DISABLE_FLUSH, TranslogService.this.disableFlush);
if (disableFlush != TranslogService.this.disableFlush) {
logger.info("updating disable_flush from [{}] to [{}]", TranslogService.this.disableFlush, disableFlush);
TranslogService.this.disableFlush = disableFlush;
}
}
}
private TimeValue computeNextInterval() {
return new TimeValue(interval.millis() + (ThreadLocalRandom.current().nextLong(interval.millis())));
}
private class TranslogBasedFlush implements Runnable {
private volatile long lastFlushTime = System.currentTimeMillis();
@Override
public void run() {
if (indexShard.state() == IndexShardState.CLOSED) {
return;
}
// flush is disabled, but still reschedule
if (disableFlush) {
reschedule();
return;
}
if (indexShard.state() == IndexShardState.CREATED) {
reschedule();
return;
}
int currentNumberOfOperations = translog.estimatedNumberOfOperations();
if (currentNumberOfOperations == 0) {
reschedule();
return;
}
if (flushThresholdOperations > 0) {
if (currentNumberOfOperations > flushThresholdOperations) {
logger.trace("flushing translog, operations [{}], breached [{}]", currentNumberOfOperations, flushThresholdOperations);
asyncFlushAndReschedule();
return;
}
}
if (flushThresholdSize.bytes() > 0) {
long sizeInBytes = translog.translogSizeInBytes();
if (sizeInBytes > flushThresholdSize.bytes()) {
logger.trace("flushing translog, size [{}], breached [{}]", new ByteSizeValue(sizeInBytes), flushThresholdSize);
asyncFlushAndReschedule();
return;
}
}
if (flushThresholdPeriod.millis() > 0) {
if ((threadPool.estimatedTimeInMillis() - lastFlushTime) > flushThresholdPeriod.millis()) {
logger.trace("flushing translog, last_flush_time [{}], breached [{}]", lastFlushTime, flushThresholdPeriod);
asyncFlushAndReschedule();
return;
}
}
reschedule();
}
private void reschedule() {
future = threadPool.schedule(computeNextInterval(), ThreadPool.Names.SAME, this);
}
private void asyncFlushAndReschedule() {
threadPool.executor(ThreadPool.Names.FLUSH).execute(new Runnable() {
@Override
public void run() {
try {
indexShard.flush(new FlushRequest());
} catch (IllegalIndexShardStateException e) {
// we are being closed, or in created state, ignore
} catch (FlushNotAllowedEngineException e) {
// ignore this exception, we are not allowed to perform flush
} catch (Throwable e) {
logger.warn("failed to flush shard on translog threshold", e);
}
lastFlushTime = threadPool.estimatedTimeInMillis();
if (indexShard.state() != IndexShardState.CLOSED) {
future = threadPool.schedule(computeNextInterval(), ThreadPool.Names.SAME, TranslogBasedFlush.this);
}
}
});
}
}
}