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https://issues.apache.org/jira/browse/MAPREDUCE-6984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gergo Repas updated MAPREDUCE-6984:
-----------------------------------
Description: When the MR AM restarts, the
{outputDir}/_temporary/{appAttemptNumber} directory remains
on HDFS, even though this directory is not used during the next attempt if the
restart has been done without recovery. So if recovery is not used for the AM
restart, then the deletion of this directory can be done earlier (at the start
of the next attempt). The benefit is that more free HDFS space is available for
the next attempt. (was: When the MR AM restarts, the
{outputDir}/_temporary/{appAttemptNumber} directory remains on HDFS, even
though this directory is not used during the next attempt if the restart has
been done without recovery. So if recovery is not used for the AM restart, then
the deletion of this directory can be done earlier (at the start of the next
attempt). The benefit is that more free HDFS space is available for the next
attempt.)
> MR AM to clean up temporary files from previous attempt
> -------------------------------------------------------
>
> Key: MAPREDUCE-6984
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6984
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: applicationmaster
> Affects Versions: 3.0.0-beta1
> Reporter: Gergo Repas
> Attachments: MAPREDUCE-6984.000.patch
>
>
> When the MR AM restarts, the
> {outputDir}/_temporary/{appAttemptNumber} directory
> remains on HDFS, even though this directory is not used during the next
> attempt if the restart has been done without recovery. So if recovery is not
> used for the AM restart, then the deletion of this directory can be done
> earlier (at the start of the next attempt). The benefit is that more free
> HDFS space is available for the next attempt.
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