Jeff Zhang updated YARN-2750:
    Attachment: YARN-2750.patch

Attach a patch for initial review. 

> Allow StateMachine has callback when transition fail
> ----------------------------------------------------
>                 Key: YARN-2750
>                 URL: https://issues.apache.org/jira/browse/YARN-2750
>             Project: Hadoop YARN
>          Issue Type: Improvement
>    Affects Versions: 2.5.1
>            Reporter: Jeff Zhang
>         Attachments: YARN-2750.patch
> We have a situation that sometimes Transition may fail, but we don't want to 
> handle the fail in each Transition, we'd like to handle it in one centralized 
> place, Allow StateMachine has a callback would be good for us.

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