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[Balazs Gibizer <balazs.gibizer@xxxxxxxx>]

Based on Chris' comment above[1] I'm closing this issue on Nova. Since
Stein it is not an issue and Rocky is already in extended maintenance.
If somebody want's to fix this in Rocky and older branches the please
set the bug back to New.

[1] https://bugs.launchpad.net/nova/+bug/1829062/comments/19

** Changed in: nova
       Status: New => Won't Fix

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https://bugs.launchpad.net/bugs/1829062

Title:
  nova placement api non-responsive due to eventlet error

Status in OpenStack Compute (nova):
  Won't Fix
Status in StarlingX:
  Fix Released
Status in tripleo:
  Triaged

Bug description:
  In starlingx setup, we're running a nova docker image based on nova stable/stein as of May 6.
  We're seeing nova-compute processes stalling and not creating resource providers with placement.
  openstack hypervisor list
  +----+---------------------+-----------------+-----------------+-------+
  | ID | Hypervisor Hostname | Hypervisor Type | Host IP         | State |
  +----+---------------------+-----------------+-----------------+-------+
  | 5  | worker-1            | QEMU            | 192.168.206.247 | down  |
  | 8  | worker-2            | QEMU            | 192.168.206.211 | down  |
  +----+---------------------+-----------------+-----------------+-------+

  Observe this error in nova-placement-api logs related to eventlet at same time:
  2019-05-14 00:44:03.636229 Traceback (most recent call last):
  2019-05-14 00:44:03.636276 File "/var/lib/openstack/lib/python2.7/site-packages/eventlet/hubs/hub.py", line 460, in fire_timers
  2019-05-14 00:44:03.636536 timer()
  2019-05-14 00:44:03.636560 File "/var/lib/openstack/lib/python2.7/site-packages/eventlet/hubs/timer.py", line 59, in _call_
  2019-05-14 00:44:03.636647 cb(*args, **kw)
  2019-05-14 00:44:03.636661 File "/var/lib/openstack/lib/python2.7/site-packages/eventlet/semaphore.py", line 147, in _do_acquire
  2019-05-14 00:44:03.636774 waiter.switch()
  2019-05-14 00:44:03.636792 error: cannot switch to a different thread

  This is a new behaviour for us in stable/stein and suspect this is due to merge of eventlet related change on May 4:
  https://github.com/openstack/nova/commit/6755034e109079fb5e8bbafcd611a919f0884d14

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