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https://issues.apache.org/jira/browse/YARN-2731?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14180837#comment-14180837
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Carlo Curino commented on YARN-2731:
------------------------------------

Simple fix, invoking maybeInitBuilder() in setNMTokensFromPreviousAttempts() 
and moved it in setClientToAMTokenMasterKey... eyeballing the other methods 
they look ok, beside the invocation of maybeInitBuilder() in a getter: 
getClientToAMTokenMasterKey() which seems odd.

> RegisterApplicationMasterResponsePBImpl: not properly initialized builder
> -------------------------------------------------------------------------
>
>                 Key: YARN-2731
>                 URL: https://issues.apache.org/jira/browse/YARN-2731
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Carlo Curino
>            Assignee: Carlo Curino
>         Attachments: YARN-2731.patch
>
>
> If I am not mistaken in RegisterApplicationMasterResponsePBImpl we are 
> missing to initialize the builder in  setNMTokensFromPreviousAttempts(), and 
> we initialize the builder in the wrong place in:  setClientToAMTokenMasterKey



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