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From eolivelli <...@git.apache.org>
Subject [GitHub] zookeeper issue #227: ZOOKEEPER-2755 Allow to subclass ClientCnxnSocketNetty...
Date Sat, 08 Jul 2017 06:14:57 GMT
Github user eolivelli commented on the issue:

    https://github.com/apache/zookeeper/pull/227
  
    @ivankelly thanks for taking a look.
    I do not have numbers about local transport vs loopback.
    The first use case is to run unit tests of applications which use zk eithout opening ports.
Using an ephemeral port may work but it makes trickier setting up things. 
    Without opening ports you can run multiple parallel tests easily
    
    The second is to run applications which are made to run both in 'distributed' mode and
in single process mode and use zk and other libs, especially bookkeeper without opening ports.
    
    Opening a port can be seen as a security risk.
    For instance I have several apps which use bk as internal wal but I need to make zk port
open at least on loopback interface.
    
    I see that these points can be managed using SO level configs/tricks or using docker...but
I if cut off the network stack if zk and bk at all it will make packaging of these apps really
easy.
    
    I will update the commit message as well


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