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