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Date: Tue, 16 Oct 2012 17:23:06 +0000 (UTC)
From: "Thomas Jungblut (JIRA)" <jira@apache.org>
To: dev@hama.apache.org
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Subject: [jira] [Commented] (HAMA-642) Make GraphRunner disk based
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    [ https://issues.apache.org/jira/browse/HAMA-642?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13477179#comment-13477179 ] 

Thomas Jungblut commented on HAMA-642:
--------------------------------------

Lol found a hack.

Just add a 

bq.vertices.put(key, vertex);

instead of the buffermap put, and it works correctly again.
I'm going to provide an updated version of the patch, would be cool if someone can test this on a cluster. Thanks!
                
> Make GraphRunner disk based
> ---------------------------
>
>                 Key: HAMA-642
>                 URL: https://issues.apache.org/jira/browse/HAMA-642
>             Project: Hama
>          Issue Type: Improvement
>          Components: graph
>    Affects Versions: 0.5.0
>            Reporter: Thomas Jungblut
>            Assignee: Thomas Jungblut
>         Attachments: HAMA-642_unix_1.patch, HAMA-642_unix_2.patch, HAMA-scale_1.patch, HAMA-scale_2.patch, HAMA-scale_3.patch, HAMA-scale_4.patch
>
>
> To improve scalability we can improve the graph runner to be disk based.
> Which basically means:
> - We have just a single Vertex instance that get's refilled.
> - We directly write vertices to disk after partitioning
> - In every superstep we iterate over the vertices on disk, fill the vertex instance and call the users compute functions
> Problems:
> - State other than vertex value can't be stored easy
> - How do we deal with random access after messages have arrived?
> So I think we should make the graph runner more hybrid, like using the queues we have implemented in the messaging. So the graphrunner can be configured to run completely on disk, in cached mode or in in-memory mode.

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