Junping Du commented on YARN-4087:

Patch LGTM.
bq. +1, if fail-fast hasn't been in any prior release and we are not 
drastically altering the behavior.
I believe fail-fast just involve recently. However, the default behavior when 
RM/NM state store get failed could be different from previous releases: it 
failed NM/RM daemons previously, now we could tolerant it keep running with log 
some error messages. We should definitely note this in our release notes. Also, 
may be we should mark this JIRA as incompatible (for behavior)?

> Set YARN_FAIL_FAST to be false by default
> -----------------------------------------
>                 Key: YARN-4087
>                 URL: https://issues.apache.org/jira/browse/YARN-4087
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Jian He
>            Assignee: Jian He
>         Attachments: YARN-4087.1.patch, YARN-4087.2.patch
> Increasingly, I feel setting this property to be false makes more sense 
> especially in production environment, 

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