Public bug reported:
Hi,
I have a cloud running xenial/mitaka (with 18.02 charms).
Sometimes, an instance will take minutes to delete. I tracked down the
time taken to be file deletion :
Apr 23 07:23:00 hostname nova-compute[54255]: 2018-04-23 07:23:00.920
54255 INFO nova.virt.libvirt.driver [req-
35ccfe64-9280-4de6-ae88-045ca91bf90f bc0ab055427645aca4ed09266e85b1db
1cb457a8302543fea067e5f14b5241e7 - - -] [instance: 97731f51-63be-4056
-869f-084b38580b9a] Deleting instance files
/srv/nova/instances/97731f51-63be-4056-869f-084b38580b9a_del
Apr 23 07:27:33 hostname nova-compute[54255]: 2018-04-23 07:27:33.767
54255 INFO nova.virt.libvirt.driver [req-
35ccfe64-9280-4de6-ae88-045ca91bf90f bc0ab055427645aca4ed09266e85b1db
1cb457a8302543fea067e5f14b5241e7 - - -] [instance: 97731f51-63be-4056
-869f-084b38580b9a] Deletion of /srv/nova/instances/97731f51-63be-4056
-869f-084b38580b9a_del complete
As you can see, 4 minutes and 33 seconds have elapsed between the 2 lines.
nova-compute logs absolutely _nothing_ during this time. Periodic tasks are not
run, etc... Generally, a deletion takes a few seconds top.
The logs above are generally immediately followed by :
Apr 23 07:27:33 hostname nova-compute[54255]: 2018-04-23 07:27:33.771
54255 DEBUG oslo.messaging._drivers.impl_rabbit [req-
35ccfe64-9280-4de6-ae88-045ca91bf90f bc0ab055427645aca4ed09266e85b1db
1cb457a8302543fea067e5f14b5241e7 - - -] Received recoverable error from
kombu: on_error /usr/lib/python2.7/dist-
packages/oslo_messaging/_drivers/impl_rabbit.py:683
(which is error: [Errno 104] Connection reset by peer)
because nova-compute doesn't even maintain the rabbitmq connection (on
the rabbitmq server I can see errors about "Missed heartbeats from
client, timeout: 60s").
So nova-compute appears to be "frozen" during several minutes. This can
cause problems because events can be missed, etc...
We have telegraf on this host, and there's little to no CPU, disk,
network or memory activity at that time. Nothing relevant in kern.log
either. And this is happening on 3 different architectures, so this is
all very puzzling.
Is nova-compute supposed to be totally stuck while deleting instance
files ? Have you ever seen something similar ?
I'm going to try to repro on queens.
Thanks
** Affects: nova (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1766543
Title:
instance deletion takes a while and blocks nova-compute
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