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https://issues.apache.org/jira/browse/YARN-2942?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Kanter updated YARN-2942:
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Attachment: CombinedAggregatedLogsProposal_v6.pdf
I've uploaded a v6 design (CombinedAggregatedLogsProposal_v6.pdf) based on
offline discussion with Vinod and Karthik. It's mostly the original design
where logs are appended (concat is not used), but we now have a Service that
handles the appending and we're going to store the list of applications that
need to be appended so recovery will work. As long as the NM comes back up,
all logs should eventually be combined now.
[~vinodkv], can you take a look at the document?
> 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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