Github user tnachen commented on the pull request:
https://github.com/apache/spark/pull/8872#issuecomment-183898284
We already have some shared logic of using multiple resources from
different roles, it just wasn't plugged in when I wrote the cluster scheduler.
I think now we have a refactored coarse grained scheduler, we can take a
step back and refactor both of these so a scheduler can have pluggable pieces
when it comes to launching tasks and placing resources, etc. For now I think
this PR is still valid that we just want to plug in the existing multiple role
logic into cluster scheduler.
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