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On 21 April 2016 at 16:54, Boden Russell <bodenvmw at gmail.com> wrote:

> On 4/20/16 3:29 PM, Doug Hellmann wrote:
> > Yes, please, let's try to make that work and contribute upstream if we
> > need minor modifications, before we create something new.
>
> We can leverage the 'retrying' module (already in global requirements).
> It lacks a few things we need, but those can be implemented using its
> existing "hooks" today, or, working with the module owner(s) to push a
> few changes that we need (the later probably provides the "greatest good").
>

Retrying (even if mostly a 1-man effort) already has a history of
contribution from different sources, including a few OpenStack contributors
as well.
It hasn't had many commits in the past 12 months, but this does not mean
new PRs won't be accepted.
Starting a new library for something like this really feels like NIH.

As for hooks vs contributions this really depends on what you need to add.
Can you share more details on the "few things we need" that retrying is
lacking?
(and I apologise if you shared them earlier in this thread - I did not read
all of it)


>
> Assuming we'll leverage 'retrying', I was thinking the initial goals
> here are:
> (a) Ensure 'retrying' supports the behaviors we need for our usages in
> neutron + nova (see [1] - [5] on my initial note) today. Implementation
> details TBD.
> (b) Implement a "Backing off RPC client" in oslo, inspired by [1].
>

Do you think oslo_messaging would be a good target? Or do you think it
should go somewhere else?


> (c) Update nova + neutron to use the "common implementation(s)" rather
> than 1-offs.
>
> This sounds fun and I'm happy to take it on. However, I probably won't

make much progress until after the summit for obvious reasons. I'll plan
> to lead with code, if a RFE/spec/other is needed please let me know.


> Additional comments welcomed.
>
>
> Thanks
>
> [1] https://review.openstack.org/#/c/280595
>
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