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https://issues.apache.org/jira/browse/YARN-1416?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13829251#comment-13829251
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Jian He commented on YARN-1416:
-------------------------------

The reason for this invalid event transition is that inside testGetClientToken, 
it's manually controlling attempt to move some state such that some logic can 
be performed in one of the attemptTransition, which cause an unexpected event 
sent from attempt.  and the whole TestRMAppTransitions unit tests are just 
bypassing attempt transition logic and just manually sending the app event to 
trigger the app transition,  I think this can be fine ?

I put some comments for describing the test purposes.

bq. Do we know how many tests are reporting such exceptions but passing 
successfully?
This is the only invalid event exception in TestRMAppTransitions, all others 
are fixed.
No invalid event exception found TestRMAppAttemptTransitions.


> InvalidStateTransitions getting reported in multiple test cases even though 
> they pass
> -------------------------------------------------------------------------------------
>
>                 Key: YARN-1416
>                 URL: https://issues.apache.org/jira/browse/YARN-1416
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Omkar Vinit Joshi
>            Assignee: Jian He
>         Attachments: YARN-1416.1.patch, YARN-1416.1.patch, YARN-1416.2.patch
>
>
> It might be worth checking why they are reporting this.
> Testcase : TestRMAppTransitions, TestRM
> there are large number of such errors.
> can't handle RMAppEventType.APP_UPDATE_SAVED at RMAppState.FAILED



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