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Posted to mapreduce-issues@hadoop.apache.org by "Vinod K V (JIRA)" <ji...@apache.org> on 2009/10/16 06:53:31 UTC
[jira] Commented: (MAPREDUCE-158) mapred.userlog.retain.hours
killing long running tasks
[ https://issues.apache.org/jira/browse/MAPREDUCE-158?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12766410#action_12766410 ]
Vinod K V commented on MAPREDUCE-158:
-------------------------------------
This issue is circumvented after HADOOP-4374 and so is not visible beyond 0.20.
The reason why logs of running tasks are no longer cleaned up causing failures is that HADOOP-4374 introduced log.tmp for atomicity of changes to log.index which is periodically created and written to by a running task. This results in a periodic change in modification time of attempt-log directory and prevents its cleanup even though _mapred.userlog.retain.hours_ is over.
So what should be done here? Close this issue? Or make the check for running tasks explicit during cleanup?
> mapred.userlog.retain.hours killing long running tasks
> ------------------------------------------------------
>
> Key: MAPREDUCE-158
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-158
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: tasktracker
> Environment: 0.19.2-dev, r753365
> Reporter: Billy Pearson
> Attachments: hadoop-5600.patch
>
>
> One can reproduce the scenario by configuring mapred.userlog.retain.hours to 1hr, and running tasks that take more than an hour.
> More info on closed ticket HADOOP-5591.
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