[jira] [Commented] (YARN-2510) RM can drop container completion events

["Jason Lowe (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/YARN-2510?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14120544#comment-14120544 ] 

Jason Lowe commented on YARN-2510:
----------------------------------

Saw an example of this today where the RM seemed to drop a container completion event for a MapReduce AM.  The RM log showed it received the container completion event from the NM:

{noformat}
2014-09-02 16:03:30,270 [ResourceManager Event Processor] INFO capacity.CapacityScheduler: Application attempt appattempt_1407992474095_785859_000001 released container container_1407992474095_785859_01_010123 on node: host: xx #containers=x available=x used=x with event: FINISHED
{noformat}

However the MapReduce AM never received the container completion event.  It always logs a "Received completed container " message for every finished container event it receives from the RM, but that log message was missing for this particular container.  That lost container completion event (along with 8 others) caused the MapReduce AM to think it still had map containers left to be released and then failed to preempt reducers when the headroom went to zero.

> RM can drop container completion events
> ---------------------------------------
>
>                 Key: YARN-2510
>                 URL: https://issues.apache.org/jira/browse/YARN-2510
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>    Affects Versions: 2.5.0
>            Reporter: Jason Lowe
>            Priority: Critical
>
> The RM can drop container completion events and fail to report them to the AM.  Details in the first comment.



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