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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 Wed, 14 Oct 2009 10:54:31 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1100?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12765508#action_12765508
] 

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

One point to remember is how we deal with jvm-reuse. In case of jvm reuse, all tasks running
in a jvm will write to single file and so, limit on the size of the file should be increased
n times, where n is the number of tasks running in a single JVM.

To be more fool-proof, we may also remove writable permissions on the log files once the task
finishes(and once the jvm finishes in jvm reuse case).

> 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
>
> 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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