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https://issues.apache.org/jira/browse/YARN-4401?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15033040#comment-15033040
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Rohith Sharma K S commented on YARN-4401:
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In an ideal case, app recovery should not fail. If it fails, then fix should 
given to "cause of failure". Do you have in mind any specific scenario which is 
causing recovery failure? I am open to get convinced:-)

> A failed app recovery should not prevent the RM from starting
> -------------------------------------------------------------
>
>                 Key: YARN-4401
>                 URL: https://issues.apache.org/jira/browse/YARN-4401
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: resourcemanager
>    Affects Versions: 2.7.1
>            Reporter: Daniel Templeton
>            Assignee: Daniel Templeton
>            Priority: Critical
>
> There are many different reasons why an app recovery could fail with an 
> exception, causing the RM start to be aborted.  If that happens the RM will 
> fail to start.  Presumably, the reason the RM is trying to do a recovery is 
> that it's the standby trying to fill in for the active.  Failing to come up 
> defeats the purpose of the HA configuration.  Instead of preventing the RM 
> from starting, a failed app recovery should log an error and skip the 
> application.



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