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From "Robert Kanter (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2942) Aggregated Log Files should be combined
Date Sat, 02 May 2015 00:03:53 GMT

    [ https://issues.apache.org/jira/browse/YARN-2942?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14524338#comment-14524338
] 

Robert Kanter commented on YARN-2942:
-------------------------------------

I've been playing around with the LogAggregationStatus stuff and I think we should be able
to build on top of it.  I'm working on a new design document that I'll hopefully post sometime
early next week.

> 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,
CompactedAggregatedLogsProposal_v1.pdf, CompactedAggregatedLogsProposal_v2.pdf, ConcatableAggregatedLogsProposal_v4.pdf,
ConcatableAggregatedLogsProposal_v5.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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