[Bug 1908375] Please test proposed package

[Łukasz Zemczak]

Hello Dariusz, or anyone else affected,

Accepted ceph into bionic-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/ceph/12.2.13-0ubuntu0.18.04.8 in a
few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
bionic to verification-done-bionic. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-bionic. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

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https://bugs.launchpad.net/bugs/1908375

Title:
  ceph-volume lvm list <device> calls blkid numerous times for
  differrent devices

Status in Ubuntu Cloud Archive:
  New
Status in Ubuntu Cloud Archive queens series:
  New
Status in ceph package in Ubuntu:
  Fix Released
Status in ceph source package in Bionic:
  Fix Committed
Status in ceph source package in Focal:
  Fix Released
Status in ceph source package in Groovy:
  Fix Released

Bug description:
  [Impact]

   * Every ceph-volume list lvm <device> call invokes blkid for numerous PARTUUIDs. For some setups with many slower IO devices this can make this call to run for minutes without any actual justification for that.
  In fact, the upstream ceph approach changed in this matter and post-bionic releases already have ceph-volume that does not invoke blkid at all in this context making the call much faster.

  Please examine the attached ceph-volume.log fragment for a ceph-volume
  call, the accumulated blkid calls take around 1 min 7 s.

  [Test Case]

   * Setup a ceph-osd with numerous block devices with long access time for blkid. Preferably use automation tools like juju (with ceph charm) or ansible to make sure ceph-volume calls work well when automated.
   * Run
  time ceph-volume --log-path ceph-volume.log --log-level debug lvm list <device>
  on one of them and check the log to see if the execution time is not wasted on numerous blkid calls.

  [Where problems could occur]

   * The output format of does not change. The only noticeable change
  will be visible in the (created on request with the --log-level --log-
  path switched) log file. Such log will also be missing the blkid
  calls. I don't see a reason for parsing that log file, but if any
  system (like CI) is doing that it may need a manual intervention to
  update its expected result.

  [Other Info]

   * The fix to this is available for Focal and beyond.
   * Xenial is not affected due to lack of ceph-volume in its ceph release.

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