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https://issues.apache.org/jira/browse/YARN-3260?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bibin A Chundatt updated YARN-3260:
-----------------------------------
Attachment: YARN-3260.001.patch
Attaching patch as per the discussion in YARN-6803.
{quote}
As per YARN-1214 if client token is send to client before credentials are saved
is problematic.
So the fix could be to move the client masterkey setting to
AttemptStoredTransition before launch call and for UnmanagedAM in
UnmanagedAMAttemptSavedTransition.
{quote}
> 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
> Attachments: YARN-3260.001.patch
>
>
> 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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