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From "Karthik Kambatla (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2942) Aggregated Log Files should be compacted
Date Wed, 18 Feb 2015 18:36:14 GMT

    [ https://issues.apache.org/jira/browse/YARN-2942?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14326333#comment-14326333
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Karthik Kambatla commented on YARN-2942:
----------------------------------------

I have been involved in the design. I like the currently design mainly because it is an optimization.
In the final document, I didn't quite get what the Cleaner service would do. [~rkanter] -
could you elaborate? 


> Aggregated Log Files should be compacted
> ----------------------------------------
>
>                 Key: YARN-2942
>                 URL: https://issues.apache.org/jira/browse/YARN-2942
>             Project: Hadoop YARN
>          Issue Type: New Feature
>    Affects Versions: 2.6.0
>            Reporter: Robert Kanter
>            Assignee: Robert Kanter
>         Attachments: CompactedAggregatedLogsProposal_v1.pdf, CompactedAggregatedLogsProposal_v2.pdf,
YARN-2942-preliminary.001.patch, YARN-2942-preliminary.002.patch, YARN-2942.001.patch, YARN-2942.002.patch,
YARN-2942.003.patch
>
>
> Turning on log aggregation allows users to easily store container logs in HDFS and subsequently
view them in the YARN web UIs from a central place.  Currently, there is a separate log file
for each Node Manager.  This can be a problem for HDFS if you have a cluster with many nodes
as you’ll slowly start accumulating many (possibly small) files per YARN application.  The
current “solution” for this problem is to configure YARN (actually the JHS) to automatically
delete these files after some amount of time.  
> We should improve this by compacting the per-node aggregated log files into one log file
per application.



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