Github user ArtRand commented on the issue:
https://github.com/apache/spark/pull/19390
Just to reiterate our conversation here.
The `AllocationInfo` tells the scheduler which `role`âs allocation of
resources the `Offer` is coming from, whereas the `ReservationInfo` tells the
scheduler whether or not the `Offer` contains reserved resources. We needed the
latter to effectively user dynamically reserved resources.
From your (old) PR it looks like the `AllocationInfo` is mostly just
âforwardedâ, i.e. there isnât any logic around itâs contents. So your
new PR removes references to `AllocationInfo` to prevent breaking with Mesos
1.3- and remain non-MULTI_ROLE.
The purpose of `AllocationInfo` is (in the future) to be able to have some
logic around which tasks get launched on resources allocated to various roles
that a framework is subscribed as - but we donât have that yet and isn't
addressed in this patch.
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