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From "Hyunsik Choi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (GIRAPH-12) Investigate communication improvements
Date Sat, 17 Sep 2011 04:20:09 GMT

    [ https://issues.apache.org/jira/browse/GIRAPH-12?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13107014#comment-13107014
] 

Hyunsik Choi commented on GIRAPH-12:
------------------------------------

Above all, I'm sorry for delaying this work. 

Jake,
I welcome your plan! We can compare both approaches and advice each other.
As you said, we can choose better one :)


> 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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