Jun Gong commented on YARN-3094:

[~adhoot] Thank you for the comment. It is really very useful. The new patch 
addressed it.

> reset timer for liveness monitors after RM recovery
> ---------------------------------------------------
>                 Key: YARN-3094
>                 URL: https://issues.apache.org/jira/browse/YARN-3094
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>    Affects Versions: 2.6.0
>            Reporter: Jun Gong
>            Assignee: Jun Gong
>         Attachments: YARN-3094.2.patch, YARN-3094.3.patch, YARN-3094.patch
> When RM restarts, it will recover RMAppAttempts and registry them to 
> AMLivenessMonitor if they are not in final state. AM will time out in RM if 
> the recover process takes long time due to some reasons(e.g. too many apps). 
> In our system, we found the recover process took about 3 mins, and all AM 
> time out.

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