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https://issues.apache.org/jira/browse/MAPREDUCE-3905?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13222663#comment-13222663
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Siddharth Seth commented on MAPREDUCE-3905:
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In the initial patch, am planning to only support per job enable/disable 
aggregation. Along with this - an option to keep the logs on the NM for some 
time if the job disables aggregation.
Something like FAILED_ONLY will not work very well rightnow - since container 
exit status is not necessarily an indication of whether a task completes 
successfully or not.
                
> Allow per job log aggregation configuration
> -------------------------------------------
>
>                 Key: MAPREDUCE-3905
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3905
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: mrv2
>    Affects Versions: 0.23.0
>            Reporter: Siddharth Seth
>            Assignee: Siddharth Seth
>
> Currently, if log aggregation is enabled for a cluster - logs for all jobs 
> will be aggregated - leading to a whole bunch of files on hdfs which users 
> may not want.
> Users should be able to control this along with the aggregation policy - 
> failed only, all, etc.

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