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From "Edward J. Yoon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HAMA-629) Improve RPC Scalability Part 2
Date Mon, 10 Mar 2014 02:08:45 GMT

    [ https://issues.apache.org/jira/browse/HAMA-629?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13925399#comment-13925399
] 

Edward J. Yoon commented on HAMA-629:
-------------------------------------

I've moved this issue to graph component.

> Improve RPC Scalability Part 2
> ------------------------------
>
>                 Key: HAMA-629
>                 URL: https://issues.apache.org/jira/browse/HAMA-629
>             Project: Hama
>          Issue Type: Sub-task
>          Components: graph
>    Affects Versions: 0.5.0
>            Reporter: Thomas Jungblut
>             Fix For: 0.7.0
>
>
> There is a problem when all 1k peers would attempt to send to a single peer (let's say
a master task in a graph algorithm that aggregates). In this case the peer will start 1k-threads
which is using enourmous amount of memory. 
> I think we can coordinate the message sending either with Zookeeper or by using the task
id and do a smarter sending chain.
> By the last, I mean, that each task can start at a different offset in the peer array
to start sending messages to the other peers. But this won't solve the problem DDoS'ing a
single master task.



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