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Moving this to the ml as requested, would appreciate
comments/thoughts/feedback.

So, I recently proposed a small patch to the oslo rpc code (initially in
oslo-incubator then moved to oslo.messaging) which extends the existing
support for limiting the rpc thread pool so that concurrent requests can
be limited based on type/method. The blueprint and patch are here:

https://blueprints.launchpad.net/oslo.messaging/+spec/rpc-concurrency-control

The basic idea is that if you have server with limited resources you may
want restrict operations that would impact those resources e.g. live
migrations on a specific hypervisor or volume formatting on particular
volume node. This patch allows you, admittedly in a very crude way, to
apply a fixed limit to a set of rpc methods. I would like to know
whether or not people think this is sort of thing would be useful or
whether it alludes to a more fundamental issue that should be dealt with
in a different manner.

Thoughts?

Ed.