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From "Matthieu Morel (Commented) (JIRA)" <>
Subject [jira] [Commented] (S4-7) Netty to tolerate network glitches and connection loss
Date Thu, 19 Jan 2012 18:26:40 GMT


Matthieu Morel commented on S4-7:

Thanks Karthik!

For updating the patch, it will be easier to have only 1 file with all your changes. And I
think you can generate a patch that contains several commits.
> Netty to tolerate network glitches and connection loss
> ------------------------------------------------------
>                 Key: S4-7
>                 URL:
>             Project: Apache S4
>          Issue Type: Bug
>            Reporter: Leo Neumeyer
>            Assignee: Karthik Kambatla
>             Fix For: 0.5
>         Attachments: S4-7-Robust-TCPEmitter-asynchronous-ordered.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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