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https://issues.apache.org/jira/browse/MAPREDUCE-2415?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13014474#comment-13014474
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Ravi Gummadi commented on MAPREDUCE-2415:
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>> to strengthen TaskTracker reliability w.r.t disk failures.
In addition to that, user logs can grow to bigger sizes and can stay alive for
more time by setting mapred.userlog.retain.hours to higher value because of
spreading them on to multiple disks.
> Distribute TaskTracker userlogs onto multiple disks
> ---------------------------------------------------
>
> Key: MAPREDUCE-2415
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2415
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: task-controller, tasktracker
> Affects Versions: 0.20.204.0
> Reporter: Bharath Mundlapudi
> Assignee: Bharath Mundlapudi
> Fix For: 0.20.204.0
>
> Attachments: MAPREDUCE-2415-1.patch, TaskTracker Userlogs Design.pdf
>
>
> Currently, userlogs directory in TaskTracker is placed under hadoop.log.dir
> like <hadoop.log.dir>/userlogs. I am proposing to spread these userlogs onto
> multiple configured mapred.local.dirs to strengthen TaskTracker reliability
> w.r.t disk failures.
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