[openstack-dev] [all] FYI - dropping non RabbitMQ support in devstack

Clint Byrum clint at fewbar.com
Tue Jun 16 16:49:51 UTC 2015

Excerpts from Sean Dague's message of 2015-06-16 06:22:23 -0700:
> FYI,
> One of the things that came out of the summit for Devstack plans going
> forward is to trim it back to something more opinionated and remove a
> bunch of low use optionality in the process.
> One of those branches to be trimmed is all the support for things beyond
> RabbitMQ in the rpc layer. RabbitMQ is what's used by 95%+ of our
> community, that's what the development environment should focus on.
> The patch to remove all of this is here -
> https://review.openstack.org/#/c/192154/. Expect this to merge by the
> end of the month. If people are interested in non RabbitMQ external
> plugins, now is the time to start writing them. The oslo.messaging team
> already moved their functional test installation for alternative
> platforms off of devstack, so this should impact a very small number of
> people.

The recent spec we added to define a policy for oslo.messaging drivers is
intended as a way to encourage that 5% who feels a different messaging
layer is critical to participate upstream by adding devstack-gate jobs
and committing developers to keep them stable. This change basically
slams the door in their face and says "good luck, we don't actually care
about accomodating you." This will drive them more into the shadows,
and push their forks even further away from the core of the project. If
that's your intention, then we need to have a longer conversation where
you explain to me why you feel that's a good thing.

Also, I take issue with the value assigned to dropping it. If that 95%
is calculated as orgs_running_on_rabbit/orgs then it's telling a really
lop-sided story. I'd rather see compute_nodes_on_rabbit/compute_nodes.

I'd like to propose that we leave all of this in tree to match what is
in oslo.messaging. I think devstack should follow oslo.messaging and
deprecate the ones that oslo.messaging deprecates. Otherwise I feel like
we're Vizzini cutting the rope just as The Dread Pirate 0mq is about to
climb the last 10 meters to the top of the cliffs of insanity and battle
RabbitMQ left handed. I know, "inconceivable" right?

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