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https://issues.apache.org/jira/browse/YARN-8435?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16528350#comment-16528350
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Giovanni Matteo Fumarola edited comment on YARN-8435 at 6/29/18 10:59 PM:
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Thanks [~tanujnay] for validating the fix and to find the performance 
regression.
 [~NeoMatrix]  do you mind changing the code in a way that does not create the 
pipeline for every request?


was (Author: giovanni.fumarola):
Thanks [~tanujnay] for validating the fix and to find the performance 
regression.
[~NeoMatrix]  do you mind changing the code in a way that does not create the 
pipeline for every requests?

> 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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