On 06/08/2017 12:47 AM, Joshua Harlow wrote:
So just out of curiosity, but do people really even know what etcd is
good for? I am thinking that there should be some guidance from folks in
the community as to where etcd should be used and where it shouldn't
(otherwise we just all end up in a mess).
So far I've seen a proposal of etcd3 as a replacement for memcached in
keystone, and a new dogpile connector was added to oslo.cache to handle
referring to etcd3 as a cache backend. This is a really simplistic /
minimal kind of use case for a key-store.
But, keeping in mind I don't know anything about etcd3 other than "it's
another key-store", it's the only database used by Kubernetes as a
whole, which suggests it's doing a better job than Redis in terms of
"durable". So I wouldn't be surprised if new / existing openstack
applications express some gravitational pull towards using it as their
own datastore as well. I'll be trying to hang onto the etcd3 track as
much as possible so that if/when that happens I still have a job :).
Perhaps a good idea to actually give examples of how it should be used,
how it shouldn't be used, what it offers, what it doesn't... Or at least
provide links for people to read up on this.
Thoughts?
Davanum Srinivas wrote:
One clarification: Since https://pypi.python.org/pypi/etcd3gw just
uses the HTTP API (/v3alpha) it will work under both eventlet and
non-eventlet environments.
Thanks,
Dims
On Wed, Jun 7, 2017 at 6:47 AM, Davanum Srinivas<dava...@gmail.com>
wrote:
Team,
Here's the update to the base services resolution from the TC:
https://governance.openstack.org/tc/reference/base-services.html
First request is to Distros, Packagers, Deployers, anyone who
installs/configures OpenStack:
Please make sure you have latest etcd 3.x available in your
environment for Services to use, Fedora already does, we need help in
making sure all distros and architectures are covered.
Any project who want to use etcd v3 API via grpc, please use:
https://pypi.python.org/pypi/etcd3 (works only for non-eventlet
services)
Those that depend on eventlet, please use the etcd3 v3alpha HTTP API
using:
https://pypi.python.org/pypi/etcd3gw
If you use tooz, there are 2 driver choices for you:
https://github.com/openstack/tooz/blob/master/setup.cfg#L29
https://github.com/openstack/tooz/blob/master/setup.cfg#L30
If you use oslo.cache, there is a driver for you:
https://github.com/openstack/oslo.cache/blob/master/setup.cfg#L33
Devstack installs etcd3 by default and points cinder to it:
http://git.openstack.org/cgit/openstack-dev/devstack/tree/lib/etcd3
http://git.openstack.org/cgit/openstack-dev/devstack/tree/lib/cinder#n356
Review in progress for keystone to use etcd3 for caching:
https://review.openstack.org/#/c/469621/
Doug is working on proposal(s) for oslo.config to store some
configuration in etcd3:
https://review.openstack.org/#/c/454897/
So, feel free to turn on / test with etcd3 and report issues.
Thanks,
Dims
--
Davanum Srinivas :: https://twitter.com/dims
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