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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