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From "Avery Ching (Resolved) (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (GIRAPH-88) Message count not updated properly after GIRAPH-11
Date Tue, 15 Nov 2011 23:09:52 GMT

     [ https://issues.apache.org/jira/browse/GIRAPH-88?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Avery Ching resolved GIRAPH-88.
-------------------------------

    Resolution: Fixed

Thanks for the quick review Jakob!  Moving fast...
                
> Message count not updated properly after GIRAPH-11
> --------------------------------------------------
>
>                 Key: GIRAPH-88
>                 URL: https://issues.apache.org/jira/browse/GIRAPH-88
>             Project: Giraph
>          Issue Type: Bug
>            Reporter: Avery Ching
>         Attachments: GIRAPH-88.diff
>
>
> Email from ssc@apache.org
> Hi,
> I updated to the latest trunk (after the GIRAPH-11 commit) and wanted to
> continue to work on GIRAPH-51 where I use a small toy graph to test
> SimpleShortestPathVertex.
> Unfortunately my code did not work anymore and I guess I tracked it down
> to the fact that vertex that voted to halt are not reacted anymore when
> new messages arrive.
> In SimpleShortestPathVertex every vertex always votes to halt and only
> gets reactivated when a shorter path to it has been found. However my
> test run always finished after superstep 0.
> I don't know too much about Giraph's internals yet, but my guess is that
> the number of sent messages is not tracked correctly anymore. Therefore
> giraph finishes the algorithm (as all vertices voted to halt) although
> there should still be messages in the pipeline.
> I think I tracked it down to this behavior:
> GraphMapper declares a variable workerSentMessages = 0 and never
> increases it. This variable is given to
> BspServiceWorker.finishSuperstep() which writes it to zookeeper and uses
> it to compute the GlobalStats afterwards, which are used to decide
> whether a new superstep has to be scheduled. As it has never been
> increased, the algorithm will always stop when all vertices voted to halt.
> It would be great if someone could confirm/disprove this speculation and
> help me to continue work on GIRAPH-51

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