Forgive the top-post.
Cross-posting to openstack-operators for their feedback as well.
Ed the work seems very promising, and I am interested to see how this
evolves.
With my operator hat on I have one piece of feedback.
By adding in a new Database solution (Cassandra) we are now up to three
different database solutions in use in OpenStack
MySQL (practically everything)
MongoDB (Ceilometer)
Cassandra.
Not to mention two different message queues
Kafka (Monasca)
RabbitMQ (everything else)
Operational overhead has a cost - maintaining 3 different database
tools, backing them up, providing HA, etc. has operational cost.
This is not to say that this cannot be overseen, but it should be taken
into consideration.
And *if* they can be consolidated into an agreed solution across the
whole of OpenStack - that would be highly beneficial (IMHO).
--
Best Regards,
Maish Saidel-Keesing
On 10/08/15 03:24, Ed Leafe wrote:
On Oct 7, 2015, at 2:28 PM, Zane Bitter <zbit...@redhat.com> wrote:
It seems to me (disclaimer: not a Nova dev) that which database to use is
completely irrelevant to your proposal,
Well, not entirely. The difference is that what Cassandra offers that separates it from
other DBs is exactly the feature that we need. The solution to the scheduler isn't to
simply "use a database".
which is really about moving the scheduling from a distributed collection of
Python processes with ad-hoc (or sometimes completely missing) synchronisation
into the database to take advantage of its well-defined semantics. But you've
framed it in such a way as to guarantee that this never gets discussed, because
everyone will be too busy arguing about whether or not Cassandra is better than
Galera.
Understood - all one has to do is review the original thread from back in July
to see this happening. But the reason that I framed it then as an experiment in
which we would come up with measures of success we could all agree on up-front
was so that if someone else thought that Product Foo would be even better, we
could set up a similar test bed and try it out. IOW, instead of bikeshedding,
if you want a different color, you build another shed and we can all have a
look.
-- Ed Leafe
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