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From "Siddharth Seth (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4982) AM hung with one pending map task
Date Fri, 08 Feb 2013 18:17:13 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4982?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13574682#comment-13574682
] 

Siddharth Seth commented on MAPREDUCE-4982:
-------------------------------------------

bq. I initially thought that as well, but given that the maps field is a LinkedHashMap 
getContainerReqToReplace seems to be removing and re-adding entries into 'maps'. Alternately,
could speculation cause this - was it enabled for this job ?
                
> AM hung with one pending map task
> ---------------------------------
>
>                 Key: MAPREDUCE-4982
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4982
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mr-am
>    Affects Versions: 0.23.6
>            Reporter: Jason Lowe
>
> Saw a job that hung with one pending map task that never ran.  The task was in the SCHEDULED
state with a single attempt that was in the UNASSIGNED state.  The AM looked like it was waiting
for a container from the RM, but the RM was never granting it the one container it needed.
> I suspect the AM botched the container request bookkeeping somehow.  More details to
follow.

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