Jian He commented on YARN-3019:

To clarify: this jira is to flip recovery mode to work-preserving recovery from 
non-work-preserving recovery. The feature itself remains disabled.  i.e. 
"yarn.resourcemanager.recovery.enabled" remains false.  updating the 

Further, I'm also thinking to enable the feature itself by default and use the 
local FS as the default file system. I'm OK to do this only on trunk. That will 
uncover bugs if any. I can open a separate jira for this.

> Enable RM work-preserving restart by default 
> ---------------------------------------------
>                 Key: YARN-3019
>                 URL: https://issues.apache.org/jira/browse/YARN-3019
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>            Reporter: Jian He
>            Assignee: Jian He
> The proposal is to set 
> "yarn.resourcemanager.work-preserving-recovery.enabled" to true by default. 

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