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From "Thomas Jungblut (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HAMA-409) Add Pregel-like API
Date Fri, 24 Feb 2012 16:22:49 GMT

    [ https://issues.apache.org/jira/browse/HAMA-409?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13215717#comment-13215717
] 

Thomas Jungblut commented on HAMA-409:
--------------------------------------

I believe it is because of the updated condition.

In each task you are going through a part of the graph and check if they send some messages,
if no message is sent, you leave the loop.
I guess this causes a lock in the barrier sync, because not all tasks are reaching it then.

We had similar problems with SSSP and Pagerank in the beginning ;)
We could use counters to check if vertices have been updated globally (HAMA-515). Or we have
to manage this be messaging like in SSSP we had before.
                
> Add Pregel-like API
> -------------------
>
>                 Key: HAMA-409
>                 URL: https://issues.apache.org/jira/browse/HAMA-409
>             Project: Hama
>          Issue Type: New Feature
>          Components: bsp, examples
>    Affects Versions: 0.4.0
>            Reporter: Thomas Jungblut
>            Assignee: Edward J. Yoon
>              Labels: graph
>             Fix For: 0.5.0
>
>         Attachments: HAMA-409_v01.patch, HAMA-409_v02.patch, HAMA-409_v03.patch, HAMA-409_v04.patch,
HAMA-409_v05.patch, InlinkCount.java, hama-graph.zip, pregel_v01.patch, pregel_v02.patch,
pregel_v03.patch, test.txt
>
>
> According to what we've discussed on the mailing list, we should add a Pregel-like API.

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