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Date: Thu, 14 Jun 2012 14:04:42 +0000 (UTC)
From: "Thomas Jungblut (JIRA)" <jira@apache.org>
To: hama-dev@incubator.apache.org
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Subject: [jira] [Resolved] (HAMA-588) Add voteToHalt() mechanism in Graph
 API
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     [ https://issues.apache.org/jira/browse/HAMA-588?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Thomas Jungblut resolved HAMA-588.
----------------------------------

    Resolution: Fixed
    
> Add voteToHalt() mechanism in Graph API
> ---------------------------------------
>
>                 Key: HAMA-588
>                 URL: https://issues.apache.org/jira/browse/HAMA-588
>             Project: Hama
>          Issue Type: Improvement
>          Components: graph
>    Affects Versions: 0.5.0
>            Reporter: Apurv Verma
>            Assignee: Edward J. Yoon
>             Fix For: 0.5.0
>
>         Attachments: patch.txt
>
>
> Currently Graph API is such that when a vertex doesn't receive any messages, compute() is not called upon it.
> One way to change it is let the user decide when the algorithm has to stop.
> For this we need to add a voteToHalt() function with each vertex.
> And maintain a state variable with each vertex. A vertex which has votedToHalt() doesn't send messages in the next superstep. However if it receives any message, its voteToHalt() ends and it is again eligible to send messages.
> When all vertices have votedToHalt() algorithm should end.

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