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Posted to yarn-issues@hadoop.apache.org by "rangjiaheng (JIRA)" <ji...@apache.org> on 2018/07/02 13:58:00 UTC
[jira] [Commented] (YARN-8435) NPE when the same client
simultaneously contact for the first time Yarn Router
[ https://issues.apache.org/jira/browse/YARN-8435?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16529943#comment-16529943 ]
rangjiaheng commented on YARN-8435:
-----------------------------------
Thanks [~tanujnay] for testing, it's a very good suggestion, I have fixed it in the new patch.
Thanks [~giovanni.fumarola] for review, a new patch YARN-8435.v6.patch solved that problem. Along with a similar bug fixed:
A client request found _userPipelineMap_ contains a user key, but get nothing out because another client request initialize and expire the first user key.
Of course, one suggestion is to set a large yarn.router.pipeline.cache-max-size value such as 250, to decrease initialize since LRU expiration, for a large hadoop cluster.
> 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, YARN-8435.v6.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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