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Share netty event loops between transports (#56553)
Currently Elasticsearch creates independent event loop groups for each transport (http and internal) transport type. This is unnecessary and can lead to contention when different threads access shared resources (ex: allocators). This commit moves to a model where, by default, the event loops are shared between the transports. The previous behavior can be attained by specifically setting the http worker count.
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141 changes: 141 additions & 0 deletions
141
modules/transport-netty4/src/main/java/org/elasticsearch/transport/SharedGroupFactory.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,141 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
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| package org.elasticsearch.transport; | ||
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| import io.netty.channel.EventLoopGroup; | ||
| import io.netty.channel.nio.NioEventLoopGroup; | ||
| import io.netty.util.concurrent.Future; | ||
| import org.apache.logging.log4j.LogManager; | ||
| import org.apache.logging.log4j.Logger; | ||
| import org.elasticsearch.common.settings.Settings; | ||
| import org.elasticsearch.common.util.concurrent.AbstractRefCounted; | ||
| import org.elasticsearch.http.HttpServerTransport; | ||
| import org.elasticsearch.http.netty4.Netty4HttpServerTransport; | ||
| import org.elasticsearch.transport.netty4.Netty4Transport; | ||
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| import java.util.concurrent.TimeUnit; | ||
| import java.util.concurrent.atomic.AtomicBoolean; | ||
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| import static org.elasticsearch.common.util.concurrent.EsExecutors.daemonThreadFactory; | ||
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| /** | ||
| * Creates and returns {@link io.netty.channel.EventLoopGroup} instances. It will return a shared group for | ||
| * both {@link #getHttpGroup()} and {@link #getTransportGroup()} if | ||
| * {@link org.elasticsearch.http.netty4.Netty4HttpServerTransport#SETTING_HTTP_WORKER_COUNT} is configured to be 0. | ||
| * If that setting is not 0, then it will return a different group in the {@link #getHttpGroup()} call. | ||
| */ | ||
| public final class SharedGroupFactory { | ||
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| private static final Logger logger = LogManager.getLogger(SharedGroupFactory.class); | ||
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| private final Settings settings; | ||
| private final int workerCount; | ||
| private final int httpWorkerCount; | ||
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| private RefCountedGroup genericGroup; | ||
| private SharedGroup dedicatedHttpGroup; | ||
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| public SharedGroupFactory(Settings settings) { | ||
| this.settings = settings; | ||
| this.workerCount = Netty4Transport.WORKER_COUNT.get(settings); | ||
| this.httpWorkerCount = Netty4HttpServerTransport.SETTING_HTTP_WORKER_COUNT.get(settings); | ||
| } | ||
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| public Settings getSettings() { | ||
| return settings; | ||
| } | ||
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| public int getTransportWorkerCount() { | ||
| return workerCount; | ||
| } | ||
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| public synchronized SharedGroup getTransportGroup() { | ||
| return getGenericGroup(); | ||
| } | ||
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| public synchronized SharedGroup getHttpGroup() { | ||
| if (httpWorkerCount == 0) { | ||
| return getGenericGroup(); | ||
| } else { | ||
| if (dedicatedHttpGroup == null) { | ||
| NioEventLoopGroup eventLoopGroup = new NioEventLoopGroup(httpWorkerCount, | ||
| daemonThreadFactory(settings, HttpServerTransport.HTTP_SERVER_WORKER_THREAD_NAME_PREFIX)); | ||
| dedicatedHttpGroup = new SharedGroup(new RefCountedGroup(eventLoopGroup)); | ||
| } | ||
| return dedicatedHttpGroup; | ||
| } | ||
| } | ||
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| private SharedGroup getGenericGroup() { | ||
| if (genericGroup == null) { | ||
| EventLoopGroup eventLoopGroup = new NioEventLoopGroup(workerCount, | ||
| daemonThreadFactory(settings, TcpTransport.TRANSPORT_WORKER_THREAD_NAME_PREFIX)); | ||
| this.genericGroup = new RefCountedGroup(eventLoopGroup); | ||
| } else { | ||
| genericGroup.incRef(); | ||
| } | ||
| return new SharedGroup(genericGroup); | ||
| } | ||
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| private static class RefCountedGroup extends AbstractRefCounted { | ||
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| public static final String NAME = "ref-counted-event-loop-group"; | ||
| private final EventLoopGroup eventLoopGroup; | ||
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| private RefCountedGroup(EventLoopGroup eventLoopGroup) { | ||
| super(NAME); | ||
| this.eventLoopGroup = eventLoopGroup; | ||
| } | ||
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| @Override | ||
| protected void closeInternal() { | ||
| Future<?> shutdownFuture = eventLoopGroup.shutdownGracefully(0, 5, TimeUnit.SECONDS); | ||
| shutdownFuture.awaitUninterruptibly(); | ||
| if (shutdownFuture.isSuccess() == false) { | ||
| logger.warn("Error closing netty event loop group", shutdownFuture.cause()); | ||
| } | ||
| } | ||
| } | ||
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| /** | ||
| * Wraps the {@link RefCountedGroup}. Calls {@link RefCountedGroup#decRef()} on close. After close, | ||
| * this wrapped instance can no longer be used. | ||
| */ | ||
| public static class SharedGroup { | ||
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| private final RefCountedGroup refCountedGroup; | ||
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| private final AtomicBoolean isOpen = new AtomicBoolean(true); | ||
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| private SharedGroup(RefCountedGroup refCountedGroup) { | ||
| this.refCountedGroup = refCountedGroup; | ||
| } | ||
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| public EventLoopGroup getLowLevelGroup() { | ||
| return refCountedGroup.eventLoopGroup; | ||
| } | ||
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| public void shutdown() { | ||
| if (isOpen.compareAndSet(true, false)) { | ||
| refCountedGroup.decRef(); | ||
| } | ||
| } | ||
| } | ||
| } |
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