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From "Thomas Jungblut (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HAMA-444) All tasks should be finished at the last iteration
Date Mon, 26 Sep 2011 17:33:26 GMT

    [ https://issues.apache.org/jira/browse/HAMA-444?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13114828#comment-13114828
] 

Thomas Jungblut commented on HAMA-444:
--------------------------------------

{quote}
Simply, one way is that we can compare the size of znodes with the size of (jobConf.getNumBspTask()
- the number of completed tasks).
{quote}

Yes, but then you are not going to compare to a constant expression. Which makes the thing
a lot more difficult, consider a tasks enters the barrier and waits for notification, while
another task finishes.

> All tasks should be finished at the last iteration
> --------------------------------------------------
>
>                 Key: HAMA-444
>                 URL: https://issues.apache.org/jira/browse/HAMA-444
>             Project: Hama
>          Issue Type: Bug
>          Components: bsp
>    Affects Versions: 0.3.0
>            Reporter: Edward J. Yoon
>             Fix For: 0.4.0
>
>
> Each BSP task can be finished differently with their each conditions. In this case, all
tasks should be finished at the last iteration or comparison logic of barrier should be fixed
to avoid hang problem.

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