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From "Tanuj Nayak (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-8435) NPE when the same client simultaneously contact for the first time Yarn Router
Date Fri, 29 Jun 2018 22:54:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-8435?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16528342#comment-16528342

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,
> 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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