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From "Edward J. Yoon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HAMA-588) Add voteToHalt() mechanism in Graph API
Date Wed, 13 Jun 2012 06:56:42 GMT

    [ https://issues.apache.org/jira/browse/HAMA-588?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13294212#comment-13294212

Edward J. Yoon commented on HAMA-588:

Memo to me:

 - Add voteToHalt() method to VertexInterface.
 - Add protected boolean field 'votedToHalt' to be able to check whether voted to halt.
 - Finally, calls the compute() method for all vertices that have not voted to halt or received
new messages.

> 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
> 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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