[Bug 1704106] Re: Gathering of thin provisioning stats breaks c-vol

[Edward Hope-Morley]

stable/ocata: https://review.openstack.org/#/c/644232/

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https://bugs.launchpad.net/bugs/1704106

Title:
  Gathering of thin provisioning stats breaks c-vol

Status in Cinder:
  Fix Released
Status in Ubuntu Cloud Archive:
  New
Status in Ubuntu Cloud Archive ocata series:
  New
Status in Ubuntu Cloud Archive pike series:
  Fix Released

Bug description:
  The gathering of the thin provisioning stats is done by looping over
  all volumes:

  https://github.com/openstack/cinder/blob/master/cinder/volume/drivers/rbd.py#L369

  For larger deployments, this loop (done at start-up, upon volume
  deletion and as periodic a task) is taking too long and hence breaks
  the c-vol service.

  From what I understand, the overall idea of this stats gathering is to
  bring the current real fill status of the pool to the admin's
  attention in case over-subscription was configured. For this, a fill
  status at the pool level (rather than the volume level) should be good
  enough.

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