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From "Vinod K V (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1100) User's task-logs filling up local disks on the TaskTrackers
Date Sun, 04 Apr 2010 08:18:27 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1100?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12853237#action_12853237
] 

Vinod K V commented on MAPREDUCE-1100:
--------------------------------------

Looks like the task-logs truncation functionality through "tail -c" is broken since 0.19 itself
when jvm-reuse feature went in via HADOOP-249.

I see this issue as the final way of truncating user logs because of the limitations we have
with "tail -c". So instead of fixing "tail -c", I propose we throw it away as part of this
issue itself in favour of the truncation code being put in here, thoughts?

> User's task-logs filling up local disks on the TaskTrackers
> -----------------------------------------------------------
>
>                 Key: MAPREDUCE-1100
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1100
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: tasktracker
>    Affects Versions: 0.21.0
>            Reporter: Vinod K V
>            Assignee: Vinod K V
>         Attachments: MAPREDUCE-1100-20091102.txt, MAPREDUCE-1100-20091106.txt, MAPREDUCE-1100-20091216.2.txt,
patch-1100-fix-ydist.2.txt
>
>
> Some user's jobs are filling up TT disks by outrageous logging. mapreduce.task.userlog.limit.kb
is not enabled on the cluster. Disks are getting filled up before task-log cleanup via mapred.task.userlog.retain.hours
can kick in.

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