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https://issues.apache.org/jira/browse/MAPREDUCE-1598?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12845110#action_12845110
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Hemanth Yamijala commented on MAPREDUCE-1598:
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Amar, I don't find this key or the newly mapped key - 
mapreduce.job.userhistorylocation - used anywhere in code in trunk. Therefore, 
I think this bug does not exist for trunk at least ? But we might need fixes 
for earlier versions.

> Wrongly configured 'hadoop.job.history.user.location' can cause jobs to be 
> pinned in JobTracker's memory forever
> ----------------------------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-1598
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1598
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: jobtracker
>    Affects Versions: 0.21.0
>            Reporter: Amar Kamat
>            Priority: Blocker
>
> Wrongly configured 'hadoop.job.history.user.location' can disable 
> job-history. Jobs retires when JobHistory notifies the JobTracker after 
> moving the history file to the done folder (i.e 
> mapreduce.jobtracker.jobhistory.completed.location). If the JobHistory gets 
> disabled, JobTracker would not receive any notification and thus jobs will be 
> pinned in JobTracker's memory forever.

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