Eventlet will patch the "os" library and how it works.
If "oslo_config.cfg" is called after "eventlet":
- "oslo_config.cfg" imports "stevedore"
- "stevedore" imports "importlib_metadata"
- this library will try to use "os.open" library, but patched
- "eventlet" imports "oslo_service"
- "oslo_service" imports "oslo_logging"
- "oslo_logging" imports "oslo_config.cfg", but at this point,
the instance cfg.CONF does not exist yet
If "oslo_config.cfg" is imported before calling eventlet,
"oslo_logging" is not called and there is no circular import.
Reviewed: https:/ /review. opendev. org/741957 /git.openstack. org/cgit/ openstack/ neutron/ commit/ ?id=bc99e565155 37210a35988d3fb dec0669469d0b3
Committed: https:/
Submitter: Zuul
Branch: master
commit bc99e5651553721 0a35988d3fbdec0 669469d0b3
Author: Rodolfo Alonso Hernandez <email address hidden>
Date: Mon Jul 20 14:12:06 2020 +0000
Import "oslo_config.cfg" before "eventlet"
Eventlet will patch the "os" library and how it works.
If "oslo_config.cfg" is called after "eventlet": metadata"
- "oslo_config.cfg" imports "stevedore"
- "stevedore" imports "importlib_
- this library will try to use "os.open" library, but patched
- "eventlet" imports "oslo_service"
- "oslo_service" imports "oslo_logging"
- "oslo_logging" imports "oslo_config.cfg", but at this point,
the instance cfg.CONF does not exist yet
If "oslo_config.cfg" is imported before calling eventlet,
"oslo_logging" is not called and there is no circular import.
Closes-Bug: #1888213
[1] I8b08f289d446f4 775eac1e1a91997 fa96f25f641
Change-Id: Idcc04f46b2a01e 24dfd56cef81216 94439e0339e