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https://issues.apache.org/jira/browse/YARN-4000?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14737113#comment-14737113
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Varun Saxena commented on YARN-4000:
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Attached a patch with following changes :
# If fail fast is false, app is killed both when queue is removed and when
queue becomes parent on restart.
# If fail fast is true, an exception is thrown in both cases.
# Renamed QueueNotFoundException to QueueException to avoid creating new class
for different cases.
# Added a new RMAppKillEvent class to send kill events to RMAppImpl. This has
been done to capture a specific diagnostic message to indicate why application
has been killed. Because currently when an app is killed the diagnostic message
is always "Application killed by user." which is not quite suitable in this
case.
> RM crashes with NPE if leaf queue becomes parent queue during restart
> ---------------------------------------------------------------------
>
> Key: YARN-4000
> URL: https://issues.apache.org/jira/browse/YARN-4000
> Project: Hadoop YARN
> Issue Type: Bug
> Components: capacityscheduler, resourcemanager
> Affects Versions: 2.6.0
> Reporter: Jason Lowe
> Assignee: Varun Saxena
> Attachments: YARN-4000.01.patch
>
>
> This is a similar situation to YARN-2308. If an application is active in
> queue A and then the RM restarts with a changed capacity scheduler
> configuration where queue A becomes a parent queue to other subqueues then
> the RM will crash with a NullPointerException.
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