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Subject [GitHub] normanmaurer commented on a change in pull request #753: ZOOKEEPER-3204: Reconfig tests are constantly failing on 3.5 after applying Java 11 fix
Date Wed, 06 Feb 2019 13:34:10 GMT
normanmaurer commented on a change in pull request #753: ZOOKEEPER-3204: Reconfig tests are
constantly failing on 3.5 after applying Java 11 fix
URL: https://github.com/apache/zookeeper/pull/753#discussion_r254185337
 
 

 ##########
 File path: zookeeper-server/src/main/java/org/apache/zookeeper/common/NettyUtils.java
 ##########
 @@ -0,0 +1,76 @@
+/**
+ * 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.zookeeper.common;
+
+import io.netty.channel.EventLoopGroup;
+import io.netty.channel.epoll.Epoll;
+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;
+
+/**
+ * Helper methods for netty code.
+ */
+public class NettyUtils {
+    /**
+     * If {@link Epoll#isAvailable()} <code>== true</code>, returns a new
+     * {@link EpollEventLoopGroup}, otherwise returns a new
+     * {@link NioEventLoopGroup}.
+     * @return a new {@link EventLoopGroup}.
+     */
+    public static EventLoopGroup newNioOrEpollEventLoopGroup() {
+        if (Epoll.isAvailable()) {
+            return new EpollEventLoopGroup();
 
 Review comment:
   I wonder if you really want to use the default constructor which will use `2 * cores threads`.
Especially for clients this seems to be wasteful. 

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