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From "Thomas Jungblut (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HAMA-629) Improve RPC Scalability Part 2
Date Thu, 16 Aug 2012 16:57:38 GMT
Thomas Jungblut created HAMA-629:

             Summary: Improve RPC Scalability Part 2
                 Key: HAMA-629
                 URL: https://issues.apache.org/jira/browse/HAMA-629
             Project: Hama
          Issue Type: Sub-task
          Components: bsp core, messaging
    Affects Versions: 0.5.0
            Reporter: Thomas Jungblut

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

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