[Bug 1850754] Re: ceph-volume lvm list is O(n^2)

[Dariusz Gadomski]

** Also affects: ceph (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Also affects: ceph (Ubuntu Xenial)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1850754

Title:
  ceph-volume lvm list is O(n^2)

Status in Ceph:
  Unknown
Status in ceph package in Ubuntu:
  New
Status in ceph source package in Xenial:
  New
Status in ceph source package in Bionic:
  New

Bug description:
  ceph-volume lvm list calls take very long time due to the fact it has
  been implemented with O(n^2). This leads to unproportionally long
  execution time taking under consideration the fact that no complex
  computation is needed.

  Steps to reproduce:
  1. Create a setup with a large number of disks and logical volumes (e.g. 24)
  2. Call ceph-volume lvm list for one of the disks.
  3. Wait for the call to finish.

  Expected result:
  Call is executed within seconds at most.

  Actual result:
  Call may take even minutes in some circumstances (large number of disks, some OSDs stopped).

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