[nova][requirements] fasteners===0.16.3 held back by nova

melanie witt melwittt at gmail.com
Thu Jan 6 17:53:06 UTC 2022

On Thu Jan 06 2022 08:41:13 GMT-0800 (Pacific Standard Time), Matthew 
Thode <mthode at mthode.org> wrote:
> Subject:
> Re: [nova][requirements] fasteners===0.16.3 held back by nova
> From:
> Matthew Thode <mthode at mthode.org>
> Date:
> 1/6/22, 08:41
> To:
> Ben Nemec <openstack at nemebean.com>
> CC:
> openstack-discuss at lists.openstack.org
> That seems right, I seem to remember eventlet in there.
> -- Matthew Thode On 22-01-06 10:17:56, Ben Nemec wrote:
>> Is it still this:https://github.com/harlowja/fasteners/issues/36  ?
>> I did some investigation about a year ago with one of the fasteners
>> maintainers, but we never really came up with a definite answer as to what
>> is going on. :-/
>> On 1/5/22 20:33, Matthew Thode wrote:
>>> This one is simple, and iirc is blocked on upstream fixing something
>>> (but cannot find the reference).
>>> fasteners===0.16.3
>>> https://review.opendev.org/823470
>>> and
>>> https://review.opendev.org/804246
>>> both test this change.

I worked on the fasteners thing for Too Long of a Time last October and 
found what is happening. It is indeed the same issue from 2019 [1] and I 
explain the problem (it's long) in a new eventlet issue I opened [2].

I proposed a patch to "fix" the problem in nova [3], it was initially 
nacked because it has to do with eventlet, but it's the simplest, 
smallest change IMHO that will address the issue.

I also went on a wild goose chase trying to change all our spawn_n() 
calls with spawn() in PS2 and PS3 but it ended in a dead end. There are 
comments detailing that attempt in the review if anyone is curious.

So, based on that dead end and seeing this come up on the ML, I have 
reverted [3] to PS1 if anyone can review and give feedback on what 
approach they would prefer if they think the current approach is not 

Note: the reason we pull in fasteners is through oslo.concurrency, the 
lockutils use it.


[1] https://github.com/harlowja/fasteners/issues/36
[2] https://github.com/eventlet/eventlet/issues/731
[3] https://review.opendev.org/c/openstack/nova/+/813114

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