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https://issues.apache.org/jira/browse/HADOOP-4208?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12641387#action_12641387
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Amar Kamat commented on HADOOP-4208:
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Job recovery failure is logged to jobtracker's log along with the reason
(exception). Deleting the files doesn't cause any problem as there is nothing
one can do from those files (job.xml, job.jar and job.split). There is always
the history file to see what the final state was. Hence I think this is not a
bug but an improvement. Should we move this to 0.20? One question to answer is
what all needs to be backed up or preserved and for how long?
> Shouldn't delete the system dir after a JobTracker recovery
> -----------------------------------------------------------
>
> Key: HADOOP-4208
> URL: https://issues.apache.org/jira/browse/HADOOP-4208
> Project: Hadoop Core
> Issue Type: Bug
> Reporter: Owen O'Malley
> Assignee: Amar Kamat
>
> Debugging JobTracker crashes will be easier if the files are preserved rather
> than deleted on recovery, probably in a sub-directory.
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