[Bug 1838858] Re: backport GC AIO to Luminous

[Launchpad Bug Tracker]

This bug was fixed in the package ceph - 12.2.12-0ubuntu0.18.04.3

---------------
ceph (12.2.12-0ubuntu0.18.04.3) bionic; urgency=medium

  [ James Page ]
  * d/p/ceph-volume-wait-for-lvs.patch: Cherry pick inflight fix to
    ensure that required wal and db devices are present before
    activating OSD's (LP: #1828617).

  [ Jesse Williamson ]
  * d/p/civetweb-755-1.8-somaxconn-configurable*.patch: Backport changes
    to civetweb to allow tuning of SOMAXCONN in Ceph RADOS Gateway
    deployments (LP: #1838109).

  [ James Page ]
  * d/p/rgw-gc-use-aio.patch: Cherry pick fix to switch to using AIO for
    garbage collection of objects in the Ceph RADOS Gateway
    (LP: #1838858).

  [ Eric Desrochers ]
  * Ensure that daemons are not automatically restarted during package
    upgrades (LP: #1840347):
    - d/rules: Use "--no-restart-after-upgrade" and "--no-stop-on-upgrade"
      instead of "--no-restart-on-upgrade".
    - d/rules: Drop exclusion for ceph-[osd,mon,mds] for restarts.

 -- James Page <james.page at ubuntu.com>  Fri, 30 Aug 2019 10:11:09 +0100

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

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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 Released

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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