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https://issues.apache.org/jira/browse/YARN-4946?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16566033#comment-16566033
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Chandni Singh commented on YARN-4946:
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[~snemeth] [~rkanter] I have a question about this issue.
{quote} When the RM "forgets" about an older completed Application (e.g. RM
failover, enough time has passed, etc), the tool won't find the Application in
the RM and will just assume that its log aggregation succeeded, even if it
actually failed or is still running.
{quote}
Is the {{log aggregation status}} of an application available only from RM. Is
this not available from application-history-service or
application-timeline-service?
> RM should not consider an application as COMPLETED when log aggregation is
> not in a terminal state
> --------------------------------------------------------------------------------------------------
>
> Key: YARN-4946
> URL: https://issues.apache.org/jira/browse/YARN-4946
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: log-aggregation
> Affects Versions: 2.8.0
> Reporter: Robert Kanter
> Assignee: Szilard Nemeth
> Priority: Major
> Attachments: YARN-4946.001.patch
>
>
> MAPREDUCE-6415 added a tool that combines the aggregated log files for each
> Yarn App into a HAR file. When run, it seeds the list by looking at the
> aggregated logs directory, and then filters out ineligible apps. One of the
> criteria involves checking with the RM that an Application's log aggregation
> status is not still running and has not failed. When the RM "forgets" about
> an older completed Application (e.g. RM failover, enough time has passed,
> etc), the tool won't find the Application in the RM and will just assume that
> its log aggregation succeeded, even if it actually failed or is still running.
> We can solve this problem by doing the following:
> The RM should not consider an app to be fully completed (and thus removed
> from its history) until the aggregation status has reached a terminal state
> (e.g. SUCCEEDED, FAILED, TIME_OUT).
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