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https://issues.apache.org/jira/browse/YARN-8435?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16528342#comment-16528342
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Tanuj Nayak commented on YARN-8435:
-----------------------------------
Hey, I applied this to a small cluster and this seems to have fixed the issue I
was hitting earlier. However, the patch seems to initialize the pipeline even
when it is already initialized for the given user. Granted that duplicate
pipelines are not put into the map, their creation still seems to flood the
logs upon every application request and also add the potentially expensive
overhead of creating a pipeline every time.
> NPE when the same client simultaneously contact for the first time Yarn Router
> ------------------------------------------------------------------------------
>
> Key: YARN-8435
> URL: https://issues.apache.org/jira/browse/YARN-8435
> Project: Hadoop YARN
> Issue Type: Bug
> Components: router
> Affects Versions: 2.9.0, 3.0.2
> Reporter: rangjiaheng
> Priority: Critical
> Attachments: YARN-8435.v1.patch, YARN-8435.v2.patch,
> YARN-8435.v3.patch, YARN-8435.v4.patch, YARN-8435.v5.patch
>
>
> When Two client process (with the same user name and the same hostname) begin
> to connect to yarn router at the same time, to submit application, kill
> application, ... and so on, then a java.lang.NullPointerException may throws
> from yarn router.
>
>
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