Re: [openstack-dev] Issue with eventlet monkey patching

[Brian Rosmaita]

Thanks Slawek, this indeed looks like the problem we are having with
Glance.  Searchlight, too.


On Thu, Jan 25, 2018 at 10:53 AM, Sławomir Kapłoński
 wrote:
> Hi,
>
> Recently we found in Neutron errors with starting our agents which uses 
> eventlet.monkey_patch() method. Bug is described in [1].
>
> I heard on IRC that it's not related only to Neutron so here is what we found 
> about that.
> It looks that this issue happens on Ubuntu with python2.7 
> 2.7.12-1ubuntu0~16.04.3 with eventlet < 0.22.0 (in OpenStack requirements it 
> is set to 0.20.0).
> There is no this issue with python2.7.12-1ubuntu0~16.04.2 and eventlet 0.20.0
>
> Something similar was already reported for monotonic in [2]. From one of 
> comments there we found that problem can be caused because:
> "ctypes.util.find_library is now using subprocess.Popen, instead of os.popen 
> (python/cpython@eb063011), and eventlet monkey-patches subprocess.Popen but 
> not os.popen."
>
> It looks that eventlet patch [3] fixes/workaround this issue.
> I pushed similar patch to Neutron [4] and it looks that our issue is solved 
> for now.
>
> I hope that maybe this info will be helpful for You :)
>
> [1] https://bugs.launchpad.net/neutron/+bug/1745013
> [2] 
> https://www.bountysource.com/issues/43892421-new-monotonic-broken-on-docker
> [3] 
> https://github.comhttps://review.openstack.org/#/c/537863/1/eventlet/eventlet/commit/b756447bab51046dfc6f1e0e299cc997ab343701
> [4] https://review.openstack.org/#/c/537863
>
> —
> Best regards
> Slawek Kaplonski
> sla...@kaplonski.pl
>
>
>
>
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[openstack-dev] Issue with eventlet monkey patching

[Sławomir Kapłoński]

Hi,

Recently we found in Neutron errors with starting our agents which uses 
eventlet.monkey_patch() method. Bug is described in [1].

I heard on IRC that it's not related only to Neutron so here is what we found 
about that.
It looks that this issue happens on Ubuntu with python2.7 
2.7.12-1ubuntu0~16.04.3 with eventlet < 0.22.0 (in OpenStack requirements it is 
set to 0.20.0).
There is no this issue with python2.7.12-1ubuntu0~16.04.2 and eventlet 0.20.0

Something similar was already reported for monotonic in [2]. From one of 
comments there we found that problem can be caused because: 
"ctypes.util.find_library is now using subprocess.Popen, instead of os.popen 
(python/cpython@eb063011), and eventlet monkey-patches subprocess.Popen but not 
os.popen."

It looks that eventlet patch [3] fixes/workaround this issue.
I pushed similar patch to Neutron [4] and it looks that our issue is solved for 
now.

I hope that maybe this info will be helpful for You :)

[1] https://bugs.launchpad.net/neutron/+bug/1745013
[2] https://www.bountysource.com/issues/43892421-new-monotonic-broken-on-docker
[3] 
https://github.comhttps://review.openstack.org/#/c/537863/1/eventlet/eventlet/commit/b756447bab51046dfc6f1e0e299cc997ab343701
 
[4] https://review.openstack.org/#/c/537863

— 
Best regards
Slawek Kaplonski
sla...@kaplonski.pl




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