| /* |
| * 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.drill.exec.rpc; |
| |
| import io.netty.channel.EventLoopGroup; |
| import io.netty.channel.epoll.EpollEventLoopGroup; |
| import io.netty.channel.epoll.EpollServerSocketChannel; |
| import io.netty.channel.epoll.EpollSocketChannel; |
| import io.netty.channel.nio.NioEventLoopGroup; |
| import io.netty.channel.socket.ServerSocketChannel; |
| import io.netty.channel.socket.SocketChannel; |
| import io.netty.channel.socket.nio.NioServerSocketChannel; |
| import io.netty.channel.socket.nio.NioSocketChannel; |
| import org.apache.drill.exec.util.SystemPropertyUtil; |
| |
| import java.util.Locale; |
| |
| |
| /** |
| * TransportCheck decides whether or not to use the native EPOLL mechanism for communication. |
| */ |
| public class TransportCheck { |
| static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(TransportCheck.class); |
| |
| private static final String USE_LINUX_EPOLL = "drill.exec.enable-epoll"; |
| |
| public static final boolean SUPPORTS_EPOLL; |
| |
| static{ |
| |
| String name = SystemPropertyUtil.get("os.name").toLowerCase(Locale.US).trim(); |
| |
| // Epoll is disabled by default (see distribution/src/resources/drill-env.sh) due to |
| // https://github.com/netty/netty/issues/3539 |
| if (name.startsWith("linux") && SystemPropertyUtil.getBoolean(USE_LINUX_EPOLL, false)) { |
| SUPPORTS_EPOLL = true; |
| } else { |
| SUPPORTS_EPOLL = false; |
| } |
| } |
| |
| public static Class<? extends ServerSocketChannel> getServerSocketChannel(){ |
| if(SUPPORTS_EPOLL){ |
| return EpollServerSocketChannel.class; |
| }else{ |
| return NioServerSocketChannel.class; |
| } |
| } |
| |
| public static Class<? extends SocketChannel> getClientSocketChannel(){ |
| if(SUPPORTS_EPOLL){ |
| return EpollSocketChannel.class; |
| }else{ |
| return NioSocketChannel.class; |
| } |
| } |
| |
| public static EventLoopGroup createEventLoopGroup(int nThreads, String prefix) { |
| if(SUPPORTS_EPOLL){ |
| return new EpollEventLoopGroup(nThreads, new NamedThreadFactory(prefix)); |
| }else{ |
| return new NioEventLoopGroup(nThreads, new NamedThreadFactory(prefix)); |
| } |
| } |
| } |