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From "Karthik Kambatla (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (S4-7) Netty to tolerate network glitches and connection loss
Date Mon, 05 Mar 2012 20:45:58 GMT

    [ https://issues.apache.org/jira/browse/S4-7?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13222598#comment-13222598
] 

Karthik Kambatla commented on S4-7:
-----------------------------------

Thanks Matthieu.

I looked into the two issues - 

1. MultiPartitionDelivery: Due to the high number of messages being sent, sometimes the TCPEmitter
buffer is full and doesn't accept messages. I have modified the tests to ensure the receiver
is aware of this and doesn't continue to wait for an unsent message.

2. NetworkGlitchTest: Intermittently, this test hangs when I call Netty's Channel.close()
method. A clear description of the issue is here - http://stackoverflow.com/questions/9573436/netty-channel-close-doesnt-return
. Please help if you know anything about this.
                
> Netty to tolerate network glitches and connection loss
> ------------------------------------------------------
>
>                 Key: S4-7
>                 URL: https://issues.apache.org/jira/browse/S4-7
>             Project: Apache S4
>          Issue Type: Bug
>            Reporter: Leo Neumeyer
>            Assignee: Karthik Kambatla
>             Fix For: 0.5
>
>         Attachments: S4-7.patch
>
>
> NettyEmitter connects to different partitions and creates channels over which it communicates
to other listeners.
> It suffers from the following issues -- 
> 1. If the underlying topology changes, the channels and the associated connections are
not updated.
> 2. If a connection gets disconnected, it stays disconnected.
> 3. If for any reason, a connection can't be made, send() drops the message to be sent.
> The solution is to - 
> 1. Maintain a bounded messageQueue for each destination partition - if a connection does
not exist, the message should be queued.
> 2. Maintain a map of the channel used for each destination partition - update this map
on changes to topology, or on send() in case of disconnections.
> 3. Every time a (re-)connection is made, send the queued messages first.

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