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From "Jake Mannix (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (GIRAPH-12) Investigate communication improvements
Date Fri, 16 Sep 2011 21:50:09 GMT

    [ https://issues.apache.org/jira/browse/GIRAPH-12?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13106842#comment-13106842
] 

Jake Mannix commented on GIRAPH-12:
-----------------------------------

Hey Hyunsik, if you're going to write a "benchmark" for the RPC stuff, that would be totally
great.  I'd like to start playing around with trying Finagle in here, and we can compare notes
on what kinds of techniques among both approaches work better, unless I'd be stepping on your
toes by doing so...

> Investigate communication improvements
> --------------------------------------
>
>                 Key: GIRAPH-12
>                 URL: https://issues.apache.org/jira/browse/GIRAPH-12
>             Project: Giraph
>          Issue Type: Improvement
>          Components: bsp
>            Reporter: Avery Ching
>            Assignee: Hyunsik Choi
>            Priority: Minor
>         Attachments: GIRAPH-12_1.patch
>
>
> Currently every worker will start up a thread to communicate with every other workers.
 Hadoop RPC is used for communication.  For instance if there are 400 workers, each worker
will create 400 threads.  This ends up using a lot of memory, even with the option  
> -Dmapred.child.java.opts="-Xss64k".  
> It would be good to investigate using frameworks like Netty or custom roll our own to
improve this situation.  By moving away from Hadoop RPC, we would also make compatibility
of different Hadoop versions easier.

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