Steve Loughran commented on YARN-1565:

I think this should be part of the REST API -we just publish some JSON that 
provides this information to local and remote systems

# the values listed above
# all the special expanded variables you can use in command creation
# a select subset of YARN/Hadoop properties:defaultFS, yarn.vmem,  & some other 
props we think are useful for clients and debugging. We shouldn't publish the 
whole aggregate -site.xml values as that can leak private keys to object 

> Add a way for YARN clients to get critical YARN system properties from the RM
> -----------------------------------------------------------------------------
>                 Key: YARN-1565
>                 URL: https://issues.apache.org/jira/browse/YARN-1565
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: resourcemanager
>    Affects Versions: 2.2.0
>            Reporter: Steve Loughran
> If you are trying to build up an AM request, you need to know
> # the limits of memory, core &c for the chosen queue
> # the existing YARN classpath
> # the path separator for the target platform (so your classpath comes out 
> right)
> # cluster OS: in case you need some OS-specific changes
> The classpath can be in yarn-site.xml, but a remote client may not have that. 
> The site-xml file doesn't list Queue resource limits, cluster OS or the path 
> separator.
> A way to query the RM for these values would make it easier for YARN clients 
> to build up AM submissions with less guesswork and client-side config.

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