Github user tgravescs commented on the pull request:
https://github.com/apache/spark/pull/9095#issuecomment-147769172
yes its really more a YARN problem then a SPARK problem. Ideal the YARN
side wouldn't show cores at all if you aren't using a scheduler that does
cores, but that is kind of hard because you can write your own scheduler that
does anything.
I'm fine with documenting but if you look at the running on yarn page it
already has the below under important notes:
Whether core requests are honored in scheduling decisions depends on which
scheduler is in use and how it is configured.
If you have ideas on making that documentation better I'm fine with it.
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