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https://issues.apache.org/jira/browse/MAPREDUCE-81?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12846755#action_12846755
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Amareshwari Sriramadasu commented on MAPREDUCE-81:
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This issue doesn't exist any more, because MAPREDUCE-927 solves this by
modifying "mapred.userlog.retain.hours" to specify the time(in hours) for which
the user-logs are to be retained after the job completion.
> missing userlogs
> ----------------
>
> Key: MAPREDUCE-81
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-81
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Reporter: Christian Kunz
>
> I noticed that a long-running job taking more than 1 day can have reduce
> tasks with missing stderr and stdout log directories (the syslog files exist).
> I wonder whether it has to do with the default value of 12 hours for
> mapred.userlog.retain.hours, resulting in deletion of the stderr/stdout
> directories for reduce tasks idling till they start to actually reduce.
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