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From "Karthik Kambatla (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2942) Aggregated Log Files should be combined
Date Fri, 22 May 2015 22:23:20 GMT

    [ https://issues.apache.org/jira/browse/YARN-2942?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14556926#comment-14556926
] 

Karthik Kambatla commented on YARN-2942:
----------------------------------------

Thanks for your persistence through the multiple versions of this design, Robert. I think
we have an actionable plan now, thanks Jason and Vinod for your inputs on the JIRA and offline.


> Aggregated Log Files should be combined
> ---------------------------------------
>
>                 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: CombinedAggregatedLogsProposal_v3.pdf, CombinedAggregatedLogsProposal_v6.pdf,
CombinedAggregatedLogsProposal_v7.pdf, CompactedAggregatedLogsProposal_v1.pdf, CompactedAggregatedLogsProposal_v2.pdf,
ConcatableAggregatedLogsProposal_v4.pdf, ConcatableAggregatedLogsProposal_v5.pdf, ConcatableAggregatedLogsProposal_v8.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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