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https://issues.apache.org/jira/browse/YARN-3260?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14336665#comment-14336665
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Naganarasimha G R commented on YARN-3260:
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Hi [~jlowe], I would like to work on this issue but if you are already planning
to fix this please feel free to reassign.
> NPE if AM attempts to register before RM processes launch event
> ---------------------------------------------------------------
>
> Key: YARN-3260
> URL: https://issues.apache.org/jira/browse/YARN-3260
> Project: Hadoop YARN
> Issue Type: Bug
> Components: resourcemanager
> Affects Versions: 2.6.0
> Reporter: Jason Lowe
> Assignee: Naganarasimha G R
>
> The RM on one of our clusters was running behind on processing
> AsyncDispatcher events, and this caused AMs to fail to register due to an
> NPE. The AM was launched and attempting to register before the
> RMAppAttemptImpl had processed the LAUNCHED event, and the client to AM token
> had not been generated yet. The NPE occurred because the
> ApplicationMasterService tried to encode the missing token.
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