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From "Alessandro Presta (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (GIRAPH-259) TestBspBasic.testBspPageRank is broken
Date Wed, 01 Aug 2012 15:39:02 GMT

    [ https://issues.apache.org/jira/browse/GIRAPH-259?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13426702#comment-13426702
] 

Alessandro Presta commented on GIRAPH-259:
------------------------------------------

Is there any particular reason why MasterCompute#compute() is executed before anything else?
It seems to me that we would be more loyal to the BSP model if we didn't enforce this: MasterCompute
is just a special vertex, executed during the superstep, whose vote to halt wins over everyone
else's.
You still use it as the logical place where serial, graph-wide computations are done (for
example, checking the global value of an aggregator as a termination condition), but you don't
rely on the contract that it will be run at any specific time relative to normal vertices.

Especially since we are going to offer auto-resetting aggregators, it makes sense for MasterCompute
to be a normal aggregator user, so collecting aggregators and running compute() are two orthogonal
components.

@Avery: regarding those two failures, please see GIRAPH-276
                
> TestBspBasic.testBspPageRank is broken
> --------------------------------------
>
>                 Key: GIRAPH-259
>                 URL: https://issues.apache.org/jira/browse/GIRAPH-259
>             Project: Giraph
>          Issue Type: Bug
>            Reporter: Maja Kabiljo
>            Assignee: Maja Kabiljo
>         Attachments: GIRAPH-259-1.patch, GIRAPH-259-2.patch, GIRAPH-259-3.patch
>
>
> Test crashes on line 152 in class SimplePageRankVertex in distributed mode.

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