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From "Robert Kanter (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2942) Aggregated Log Files should be combined
Date Thu, 19 Feb 2015 00:46:13 GMT

    [ https://issues.apache.org/jira/browse/YARN-2942?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14326821#comment-14326821
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Robert Kanter commented on YARN-2942:
-------------------------------------

I've created 4 subtasks (one is in HADOOP):
# HADOOP-11612: Workaround for Curator's ChildReaper requiring Guava 15+
# YARN-3218: Implement CombinedAggregatedLogFormat Reader and Writer
# YARN-3219: Use CombinedAggregatedLogFormat Writer to combine aggregated log files
# YARN-3220: JHS should display Combined Aggregated Logs when available

> 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, 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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