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https://issues.apache.org/jira/browse/GIRAPH-12?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13107189#comment-13107189
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Avery Ching commented on GIRAPH-12:
-----------------------------------
I am assigned? Huh??
> 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: Avery Ching
> 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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