On 05/18/2017 06:13 PM, Adrian Turjak wrote:
So, specifically in the realm of Keystone, since we are using sqlalchemy we already have Postgresql support, and since Cockroachdb does talk Postgres it shouldn't be too hard to back Keystone with it. At that stage you have a Keystone DB that could be multi-region, multi-master, consistent, and mostly impervious to disaster. Is that not the holy grail for a service like Keystone? Combine that with fernet tokens and suddenly Keystone becomes a service you can't really kill, and can mostly forget about.
So this is exhibit A for why I think keeping some level of "this might need to work on other databases" within a codebase is always a great idea even if you are not actively supporting other DBs at the moment. Even if Openstack dumped Postgresql completely, I'd not take the rudimental PG-related utilities out of oslo.db nor would I rename all the "mysql_XYZ" facilities to be "XYZ".
Cockroachdb advertises SQLAlchemy compatibility very prominently. While their tutorial at https://www.cockroachlabs.com/docs/build-a-python-app-with-cockroachdb-sqlalchemy.html says it uses psycopg2 as the database driver, they have implemented their own "cockroachdb://" dialect on top of it, which likely smooths out the SQL dialect and connectivity quirks between real Postgresql and CockroachDB.
This is not the first "distributed database" to build on the Postgresql protocol, I did a bunch of work for a database that started out called "Akiban", then got merged to "FoundationDB", and then sadly was sucked into a black hole shaped like a huge Apple and the entire product and staff were gone forever. CockroachDB seems to be filling in that same hole that I was hoping FoundationDB was going to do (until they fell into said hole).
I'm welcome to being called mad, but I am curious if anyone has looked at this. I'm likely to do some tests at some stage regarding this, because I'm hoping this is the solution I've been hoping to find for quite a long time.
I'd have a blast if Keystone wanted to get into this. Distributed / NewSQL is something I have a lot of optimism about. Please keep me looped in.
Further reading: https://www.cockroachlabs.com/ https://github.com/cockroachdb/cockroach https://www.cockroachlabs.com/docs/build-a-python-app-with-cockroachdb-sqlalchemy.html Cheers, - Adrian Turjak __________________________________________________________________________ OpenStack Development Mailing List (not for usage questions) Unsubscribe: openstack-dev-requ...@lists.openstack.org?subject:unsubscribe http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
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