Feel free to take the following (if its similar to what u are thinking)
https://github.com/openstack/anvil/blob/master/anvil/utils.py#L90
IMHO though if its a decorator, the retrying library can already perform
this:
https://pypi.python.org/pypi/retrying
And a couple of the oslo-cores (jd, me) have contributed to that library
and can explain how to use it...
Overall though, let's see an initial patch and I guess we can see where
this goes and how much something like it may already exist elsewhere...
-Josh
Amrith Kumar wrote:
Boden,
Are you thinking of implementing something which would perform exponentially
backed off calls to some arbitrary function till that method returns with
something other than a timeout?
I think that would be very versatile, and useful in a wide variety of places.
Thanks,
-amrith
-----Original Message-----
From: Davanum Srinivas [mailto:[email protected]]
Sent: Wednesday, April 20, 2016 4:45 PM
To: OpenStack Development Mailing List (not for usage questions)
<[email protected]>
Subject: Re: [openstack-dev] [neutron][nova][oslo] Common backoff&
timeout utils
Sounds good to me Boden.
-- Dims
On Wed, Apr 20, 2016 at 4:10 PM, Boden Russell<[email protected]> wrote:
Today there are a number of places in nova, neutron and perhaps
elsewhere that employ backoff + timeout strategies (see [1] - [4]).
While we are working towards a unified approach in neutron for RPC
[5], it appears such logic could benefit the greater community as a
reusable oslo implementation.
IMHO such an oslo implementation could:
- Enable backoff/timeout irrespective of client/transport. This would
allow the utils to be used with various clients (HTTP, AMQP RPC, etc.).
- Support namespacing as inspired by the existing neutron patch [5].
- In the future, perhaps, allow multiple (pluggable) backoff
strategies to be used (e.g. configurable backoff).
Anyone adverse to me crafting an initial oslo patch to kick-off the
details on this one?
Thanks
[1]
https://github.com/openstack/nova/blob/master/nova/conductor/api.py#L1
62
[2]
https://github.com/openstack/nova/blob/3cdaa30566c17a2add5d9163a0693c9
7dc1d065b/nova/scheduler/utils.py#L356
[3]
https://github.com/openstack/neutron/blob/dd4f1253c951d78a5b497680dfb3
1317ba469a58/neutron/agent/l3/agent.py#L224
[4]
https://github.com/openstack/neutron/blob/42c6f05f2904cd4c01bcd3f79b19
66489f5ad3c1/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_dvr_neu
tron_agent.py#L189 [5] https://review.openstack.org/#/c/280595/
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