Billie Rinaldi commented on YARN-8060:

Uploaded patch 4 which enhances the documentation to include which 
configuration properties are allowed to be configured in which places. This was 
a useful exercise, because I discovered that the container recovery timeout was 
at the system level when it should have been at the service level, and the 
container retry properties were at the service level when they should have been 
at the component level. I fixed this in the patch. I also realized that the 
readiness check configuration properties were not documented except in the 
javadocs, so I added a section on those.

> Create default readiness check for service components
> -----------------------------------------------------
>                 Key: YARN-8060
>                 URL: https://issues.apache.org/jira/browse/YARN-8060
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: yarn-native-services
>            Reporter: Billie Rinaldi
>            Assignee: Billie Rinaldi
>            Priority: Major
>         Attachments: YARN-8060.1.patch, YARN-8060.2.patch, YARN-8060.3.patch, 
> YARN-8060.4.patch
> It is currently possible for a component instance to have READY status before 
> the AM retrieves an IP for the container. We should make sure the IP has been 
> retrieved before marking the instance as READY.
> This default probe could also have an option to check for a DNS entry for the 
> instance's hostname if a DNS address is provided.

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