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https://issues.apache.org/jira/browse/HAMA-629?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13925398#comment-13925398
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Edward J. Yoon commented on HAMA-629:
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I think this hierarchical synchronization style is fit for only master
aggregation scenario e.g., graph aggregators. The performance can be slower
than normal style in other cases.
> 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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