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Date: Mon, 12 Sep 2011 02:39:08 +0000 (UTC)
From: "Avery Ching (JIRA)" <jira@apache.org>
To: giraph-dev@incubator.apache.org
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Subject: [jira] [Commented] (GIRAPH-12) Investigate communication
 improvements
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    [ https://issues.apache.org/jira/browse/GIRAPH-12?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13102410#comment-13102410 ] 

Avery Ching commented on GIRAPH-12:
-----------------------------------

Hyunsik, this sounds good to be able to adjust the number of threads.  The tradeoff would be that perhaps some overhead of starting up and shutting down connections to the RPC servers?  I'll see if I can test this code on Yahoo!'s clusters.  I'll add a messaging benchmark with a configurable number of messages to random vertices and then do some tests.  What do you think?

> 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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