On 8/17/2018 12:30 PM, Dan Smith wrote:
The subject of using placement in Cinder has come up, and since then I've had a
few conversations with people in and outside of that team. I really think until
placement is its own project outside of the nova team, there will be resistance
from some to adopt it.
I know politics will be involved in this, but this is a really terrible
reason to do a thing, IMHO. After the most recent meeting we had with
the Cinder people on placement adoption, I'm about as convinced as ever
that Cinder won't (and won't need to) _consume_ placement any time
soon. I hope it will _report_ to placement so Nova can make better
decisions, just like Neutron does now, but I think that's the extent
we're likely to see if we're honest.
Dan,
I don't know of any reason we wouldn't want to report to placement. Just
a matter of getting a person to implement it.
Also, from a consumption standpoint we really only have one or two
people are are opposed at this point. We have time scheduled at the PTG
to discuss this further. The discussions in Vancouver seemed to be
tilting toward the fact that it might solve other technical issues we
have been having from an Active/Active HA configuration standpoint.
Just need to get the right people in the room to talk about it.
Jay
What other projects are _likely_ to _consume_ placement even if they
don't know they'd want to? What projects already want to use it but
refuse to because it has Nova smeared all over it? We talked about this
a lot in the early justification for placement, but the demand for that
hasn't really materialized, IMHO; maybe it's just me.
This reluctance on having it part of Nova may be real or just perceived, but
with it within Nova it will likely be an uphill battle for some time convincing
other projects that it is a nicely separated common service that they can use.
Splitting it out to another repository within the compute umbrella (what
do we call it these days?) satisfies the _technical_ concern of not
being able to use placement without installing the rest of the nova code
and dependency tree. Artificially creating more "perceived" distance
sounds really political to me, so let's be sure we're upfront about the
reasoning for doing that if so :)
--Dan
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