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From "Claudio Martella (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (GIRAPH-45) Improve the way to keep outgoing messages
Date Thu, 15 Dec 2011 23:11:30 GMT

    [ https://issues.apache.org/jira/browse/GIRAPH-45?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13170563#comment-13170563
] 

Claudio Martella commented on GIRAPH-45:
----------------------------------------

Great, we're converge. The BTree is for indexing destination vertices. you want to have all
the messages sent to the same vertex stored all together. It's just a TreeMap with a sample
of the keyset in the flushed file, something similar to the HBase index. The code is complete,
I'm running after a nasty bug and I'll work on integration then.

The question is: do you know a good way to detect memory pressure? I've tried with Runtime.freeMemory()
but it won't work. I was considering using a monitor softreference. any suggestion?
                
> Improve the way to keep outgoing messages
> -----------------------------------------
>
>                 Key: GIRAPH-45
>                 URL: https://issues.apache.org/jira/browse/GIRAPH-45
>             Project: Giraph
>          Issue Type: Improvement
>          Components: bsp
>            Reporter: Hyunsik Choi
>            Assignee: Hyunsik Choi
>
> As discussed in GIRAPH-12(http://goo.gl/CE32U), I think that there is a potential problem
to cause out of memory when the rate of message generation is higher than the rate of message
flush (or network bandwidth).
> To overcome this problem, we need more eager strategy for message flushing or some approach
to spill messages into disk.
> The below link is Dmitriy's suggestion.
> https://issues.apache.org/jira/browse/GIRAPH-12?focusedCommentId=13116253&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13116253

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