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From "Hyunsik Choi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (GIRAPH-12) Investigate communication improvements
Date Wed, 14 Sep 2011 08:12:08 GMT

    [ https://issues.apache.org/jira/browse/GIRAPH-12?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13104340#comment-13104340
] 

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

You mean that we need some benchmark program to test the performance and scalability of message
passing methods. If so, I'll add two benchmarking programs, which are sending messages to
peers in random and skewed distribution respectively. For this, I'll create another issue.

Let me know what 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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