| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF 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.apache.hadoop.hbase.ipc; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| import org.apache.commons.lang3.StringUtils; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.hbase.util.Pair; |
| import org.apache.yetus.audience.InterfaceAudience; |
| |
| import org.apache.hbase.thirdparty.com.google.common.base.Preconditions; |
| import org.apache.hbase.thirdparty.io.netty.channel.Channel; |
| import org.apache.hbase.thirdparty.io.netty.channel.EventLoopGroup; |
| import org.apache.hbase.thirdparty.io.netty.channel.nio.NioEventLoopGroup; |
| import org.apache.hbase.thirdparty.io.netty.channel.socket.nio.NioSocketChannel; |
| import org.apache.hbase.thirdparty.io.netty.util.concurrent.DefaultThreadFactory; |
| |
| /** |
| * Helper class for passing config to {@link NettyRpcClient}. |
| * <p> |
| * As hadoop Configuration can not pass an Object directly, we need to find a way to pass the |
| * EventLoopGroup to {@code AsyncRpcClient} if we want to use a single {@code EventLoopGroup} for |
| * the whole process. |
| * @since 2.0.0 |
| */ |
| @InterfaceAudience.Public |
| public final class NettyRpcClientConfigHelper { |
| |
| public static final String EVENT_LOOP_CONFIG = "hbase.rpc.client.event-loop.config"; |
| |
| /** |
| * Name of property to change netty rpc client eventloop thread count. Default is 0. |
| * Tests may set this down from unlimited. |
| */ |
| public static final String HBASE_NETTY_EVENTLOOP_RPCCLIENT_THREADCOUNT_KEY = |
| "hbase.netty.eventloop.rpcclient.thread.count"; |
| |
| private static final String CONFIG_NAME = "global-event-loop"; |
| |
| private static final Map<String, Pair<EventLoopGroup, Class<? extends Channel>>> |
| EVENT_LOOP_CONFIG_MAP = new HashMap<>(); |
| |
| /** |
| * Shutdown constructor. |
| */ |
| private NettyRpcClientConfigHelper() {} |
| |
| /** |
| * Set the EventLoopGroup and channel class for {@code AsyncRpcClient}. |
| */ |
| public static void setEventLoopConfig(Configuration conf, EventLoopGroup group, |
| Class<? extends Channel> channelClass) { |
| Preconditions.checkNotNull(group, "group is null"); |
| Preconditions.checkNotNull(channelClass, "channel class is null"); |
| conf.set(EVENT_LOOP_CONFIG, CONFIG_NAME); |
| EVENT_LOOP_CONFIG_MAP.put(CONFIG_NAME, |
| Pair.<EventLoopGroup, Class<? extends Channel>> newPair(group, channelClass)); |
| } |
| |
| /** |
| * The {@link NettyRpcClient} will create its own {@code NioEventLoopGroup}. |
| */ |
| public static void createEventLoopPerClient(Configuration conf) { |
| conf.set(EVENT_LOOP_CONFIG, ""); |
| EVENT_LOOP_CONFIG_MAP.clear(); |
| } |
| |
| private static volatile Pair<EventLoopGroup, Class<? extends Channel>> DEFAULT_EVENT_LOOP; |
| |
| private static Pair<EventLoopGroup, Class<? extends Channel>> |
| getDefaultEventLoopConfig(Configuration conf) { |
| Pair<EventLoopGroup, Class<? extends Channel>> eventLoop = DEFAULT_EVENT_LOOP; |
| if (eventLoop != null) { |
| return eventLoop; |
| } |
| synchronized (NettyRpcClientConfigHelper.class) { |
| eventLoop = DEFAULT_EVENT_LOOP; |
| if (eventLoop != null) { |
| return eventLoop; |
| } |
| int threadCount = conf.getInt(HBASE_NETTY_EVENTLOOP_RPCCLIENT_THREADCOUNT_KEY, 0); |
| eventLoop = new Pair<>( |
| new NioEventLoopGroup(threadCount, |
| new DefaultThreadFactory("RPCClient-NioEventLoopGroup", true, Thread.NORM_PRIORITY)), |
| NioSocketChannel.class); |
| DEFAULT_EVENT_LOOP = eventLoop; |
| } |
| return eventLoop; |
| } |
| |
| static Pair<EventLoopGroup, Class<? extends Channel>> getEventLoopConfig(Configuration conf) { |
| String name = conf.get(EVENT_LOOP_CONFIG); |
| if (name == null) { |
| return getDefaultEventLoopConfig(conf); |
| } |
| if (StringUtils.isBlank(name)) { |
| return null; |
| } |
| return EVENT_LOOP_CONFIG_MAP.get(name); |
| } |
| } |