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https://issues.apache.org/jira/browse/HAMA-521?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thomas Jungblut reassigned HAMA-521:
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Assignee: Thomas Jungblut
> Improve message buffering to save memory
> ----------------------------------------
>
> Key: HAMA-521
> URL: https://issues.apache.org/jira/browse/HAMA-521
> Project: Hama
> Issue Type: Sub-task
> Reporter: Thomas Jungblut
> Assignee: Thomas Jungblut
>
> Suraj and I had a bit of discussion about incoming and outgoing message
> buffering and scalability.
> Currently everything lies on the heap, causing huge amounts of GC and waste
> of memory. We can do better.
> Therefore we need to extract an abstract Messenger class which is directly
> under the interface but over the compressor class.
> It should abstract the use of the queues in the back (currently lot of
> duplicated code) and it should be backed by a sequencefile on local disk.
> Once sync() starts it should return a message iterator for combining and then
> gets put into a message bundle which is send over RPC.
> On the other side we get a bundle and looping over it putting everything into
> the heap making it much larger than it needs to be. Here we can also flush on
> disk because we are just using a queue-like method to the user-side.
> Plus points:
> In case we have enough heap (see our new metric system), we can also
> implement a buffering technology that is not flushing everything to disk.
> Open questions:
> I don't know how much slower the whole system gets, but it would save alot of
> memory. Maybe we should first evaluate if it is really needed.
> In any case, the refactoring of the duplicate code in the messengers is
> needed.
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