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https://issues.apache.org/jira/browse/YARN-2942?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14326958#comment-14326958
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Vinod Kumar Vavilapalli commented on YARN-2942:
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bq. The problem here is that the aggregated log files are not in an
append-friendly format (TFile). We'd have to change the file format that
they're in (perhaps reusing the similar format I created in this patch), but
this wouldn't be backwards compatible.
Precisely the point, I think we should have an append-friendly format - an
extension of today's TFile. YARN-2548 also needs the same extension. We can try
making this a compatible evolution. Even if we cannot, we can simply just
support both the formats for compat.
> 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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