Yarn defaults for local directories

[Hemanth Yamijala]

Hi,

Is there a reason why Yarn's directory paths are not defaulting to be
relative to hadoop.tmp.dir.

For e.g. yarn.nodemanager.local-dirs defaults to /tmp/nm-local-dir.
Could it be ${hadoop.tmp.dir}/nm-local-dir instead ? Similarly for the
log directories, I guess...

Thanks
hemanth