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From "Robert Joseph Evans (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3312) Make MR AM not send a stopContainer w/o corresponding start container
Date Tue, 15 Nov 2011 16:52:55 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3312?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13150603#comment-13150603

Robert Joseph Evans commented on MAPREDUCE-3312:

This is not a critical fix (it is major :)).  This is just a follow up to MAPREDUCE-3274 which
fixed the deadlock problem, but did not fix all of the underlying causes of the issue.  We
can hold off on it until MAPREDUCE-3355 and MAPREDUCE-3402 are finished.

As a side note, the reason why I put the change into TaskAttemptImpl, is because the only
way to ensure that a container is launched/killed in the proper order is to maintain some
state for all containers.  I was not sure if The container Launcher should then be modified
so that it was more like TaskAttemptImpl, where it used the state machine library, or if just
keeping the state in a concurrent hash map.
> Make MR AM not send a stopContainer w/o corresponding start container
> ---------------------------------------------------------------------
>                 Key: MAPREDUCE-3312
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3312
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: 0.23.0, 0.24.0
>            Reporter: Robert Joseph Evans
>            Assignee: Robert Joseph Evans
>             Fix For: 0.23.1
>         Attachments: MR-3312.txt
> This is a follow on to MAPREDUCE-3274.  It is possible, although rare, for the MR AM
to send a stop container before it sends a start container.  This needs to stop that from
happening.  If a stop is found first it should prevent the start from being sent.  It tries
to do this, but only if the stop is currently pending.

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