[jira] [Commented] (ZOOKEEPER-2755) Allow to subclass ClientCnxnSocketNetty and NettyServerCnxn in order to use Netty Local transport

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-2755?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15996867#comment-15996867 ] 

ASF GitHub Bot commented on ZOOKEEPER-2755:
-------------------------------------------

Github user eolivelli commented on a diff in the pull request:

    https://github.com/apache/zookeeper/pull/227#discussion_r114798834
  
    --- Diff: src/java/test/org/apache/zookeeper/test/NettyLocalSuiteTest.java ---
    @@ -0,0 +1,35 @@
    +/**
    + * 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
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    +package org.apache.zookeeper.test;
    +
    +import org.junit.runners.Suite;
    +
    +/**
    + * Run tests with: Netty Client against Netty server
    + */
    +@Suite.SuiteClasses({
    --- End diff --
    
    @afine  Thank you for your review
    
    is this patch ready for merge ?
    can you push it to the 3.5 branch too ?


> Allow to subclass ClientCnxnSocketNetty and NettyServerCnxn in order to use Netty Local transport
> -------------------------------------------------------------------------------------------------
>
>                 Key: ZOOKEEPER-2755
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2755
>             Project: ZooKeeper
>          Issue Type: New Feature
>          Components: java client, server
>    Affects Versions: 3.5.2
>            Reporter: Enrico Olivelli
>
> ClientCnxnSocketNetty and NettyServerCnxn use explicitly InetSocketAddress class to work with network addresses.
> We can do a little refactoring to use only SocketAddress and make it possible to create subclasses of ClientCnxnSocketNetty and NettyServerCnxn which leverage built-in Netty 'local' channels. 
> Such Netty local channels do not create real sockets and so allow a simple ZooKeeper server + ZooKeeper client to be run on the same JVM without binding to real TCP endpoints.
> Usecases:
> Ability to run concurrently on the same machine tests of projects which use ZooKeeper (usually in unit tests the server and the client run inside the same JVM) without dealing with random ports and in general using less network resources
> Run simplified (standalone, all processes in the same JVM) versions of applications which need a working ZooKeeper ensemble to run.
> Note:
> Embedding ZooKeeper server + client on the same JVM has many risks and in general I think we should encourage users to do so, so I in this patch I will not provide official implementations of ClientCnxnSocketNetty and NettyServerCnxn. There will be implementations only inside the test packages, in order to test that most of the features are working with custom socket factories and in particular with the 'LocalAddress' specific subclass of SocketAddress.
> Note:
> the 'Local' sockets feature will be available on Netty 4 too



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