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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 Mon, 09 Nov 2009 09:50:33 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1100?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12774921#action_12774921
] 

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

I would like to point one fine point with the above implementation:
bq. removeOldFilesToControlCumulativeUsage(); // remove very old logs if total usage is alarming
irrespective of retain.hours
With the above, retain.hours is no longer a proper contract for tasks, logs can get cleaned-up
at arbitrary times. So the 4th requirement is broken - 
bq. (4) Clean up of a particular task's user logs should be deterministic - users should have
an idea of how long they can see their logs.
The only way I think of in which this can be addressed is by taking care of the cumulative
disk-usage of TaskTracker while scheduling a new task. Should this be done too?

> 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
>
>
> 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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