[Bug 1838858] Re: backport GC AIO to Luminous

[Łukasz Zemczak]

Hello Jesse, or anyone else affected,

Accepted ceph into bionic-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/ceph/12.2.12-0ubuntu0.18.04.3 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 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.

** Changed in: ceph (Ubuntu Bionic)
       Status: In Progress => Fix Committed

** Tags added: verification-needed verification-needed-bionic

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https://bugs.launchpad.net/bugs/1838858

Title:
  backport GC AIO to Luminous

Status in Ubuntu Cloud Archive:
  Invalid
Status in Ubuntu Cloud Archive pike series:
  Won't Fix
Status in Ubuntu Cloud Archive queens series:
  In Progress
Status in ceph package in Ubuntu:
  Invalid
Status in ceph source package in Bionic:
  Fix Committed

Bug description:
  [Impact]
  In RGW deployments with large deltas for deleted objects, the garbage collector will easily fall behind on cleanup of deleted objects eventually resulting in OSD devices hitting storage capacity.

  [Test Case]
  Deploy Ceph + RADOS Gateway
  Create millions of objects in an iterative loop
  Start deleting objects in parallel at a high rate
  Storage capacity will gradually reduce over time as RGW garbage collection falls behind.

  [Tricky to reproduce without significant scale of objects + deletion
  but proposed fix has been tested in the field.]

  [Regression Potential]
  Low - fix has been accepted into Ceph Luminous upstream and will form part of the next point release.  Change to use AIO for GC is also in later Ceph releases.

  [Original Bug Report]
  SRU for backport of the GC AIO feature to Ceph Luminous.

  https://github.com/ceph/ceph/pull/28784

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