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https://issues.apache.org/jira/browse/MAPREDUCE-5711?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13867397#comment-13867397
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zhaoyunjiong commented on MAPREDUCE-5711:
-----------------------------------------

I agree with you that's duplicate of  MAPREDUCE-1144.
I'll move my patch to  MAPREDUCE-1144.
Thanks for you review.

> When JobTracker writing JobHistory to HDFS, it may hung for long time due to 
> DataNode error
> -------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-5711
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5711
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 1.2.0
>            Reporter: zhaoyunjiong
>            Assignee: zhaoyunjiong
>             Fix For: 1.2.2
>
>         Attachments: MAPREDUCE-5711-branch-1.2.patch
>
>
> When writing JobHistory to HDFS, it may takes very long time due to DataNode 
> error, unfortunately, it also hold JobTracker lock, so it makes JobTracker 
> hung for long time. It happens couple of times on our cluster.



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