[Bug 1838858] Re: backport GC AIO to Luminous

[James Page]

This bug was fixed in the package ceph - 12.2.12-0ubuntu0.18.04.3~cloud0
---------------

 ceph (12.2.12-0ubuntu0.18.04.3~cloud0) xenial-queens; urgency=medium
 .
   * New update for the Ubuntu Cloud Archive.
 .
 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.


** Changed in: cloud-archive/queens
       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:
  Fix Released
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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