Nova is being asked to do a thing, which it can't, which is put files in
the guest. This retry is actually kind of important.
The bug really is exposing the fact that *no* working file injection
mechanism exists in these rally jobs, but they are asking guests to do
something.
** Changed in: nova
Status: In Progress => Invalid
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https://bugs.launchpad.net/bugs/1438260
Title:
Expensive Device allocation loop when NBD is absent
Status in OpenStack Compute (Nova):
Invalid
Bug description:
See log stash query:
"Device allocation failed. Will retry in 2 seconds."
Example:
http://logs.openstack.org/10/163910/6/check/gate-rally-dsvm-cinder/46d89ab/logs/screen-n-cpu.txt.gz#_2015-03-30_14_55_56_941
Logs:
2015-03-30 14:55:56.940 ERROR nova.virt.disk.mount.nbd
[req-df13155c-0340-4e10-aec4-2fabea382eef None None] nbd module not loaded
2015-03-30 14:55:56.940 DEBUG oslo_concurrency.lockutils
[req-df13155c-0340-4e10-aec4-2fabea382eef None None] Lock "nbd-allocation-lock"
released by "_inner_get_dev" :: held 0.000s inner
/usr/local/lib/python2.7/dist-packages/oslo_concurrency/lockutils.py:456
2015-03-30 14:55:56.941 INFO nova.virt.disk.mount.api
[req-df13155c-0340-4e10-aec4-2fabea382eef None None] Device allocation failed.
Will retry in 2 seconds.
2015-03-30 14:55:58.941 DEBUG oslo_concurrency.lockutils
[req-df13155c-0340-4e10-aec4-2fabea382eef None None] Lock "nbd-allocation-lock"
acquired by "_inner_get_dev" :: waited 0.000s inner
/usr/local/lib/python2.7/dist-packages/oslo_concurrency/lockutils.py:444
2015-03-30 14:55:58.941 ERROR nova.virt.disk.mount.nbd
[req-df13155c-0340-4e10-aec4-2fabea382eef None None] nbd module not loaded
We should not even enter the loop when /sys/block/nbd0 is clearly
absent.
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