[Bug 1842656] Re: Bitmap allocator returns duplicate entries

[Dan Hill]

issue#40080 has been addressed upstream and the fix will be delivered in
the next point release of luminous (12.2.13).

The bitmap allocator is an experimental feature, that has been reported
unstable by upstream [0]. There isn't an urgent need to drive this fix
ahead of upstream.

Marking this bug as 'won't fix' and will update to 'fix released' when
an SRU for 12.2.13 lands.

[0] https://www.spinics.net/lists/ceph-devel/msg44622.html

** Changed in: ceph (Ubuntu)
       Status: New => Won't Fix

** Changed in: ceph (Ubuntu Bionic)
       Status: New => Won't Fix

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https://bugs.launchpad.net/bugs/1842656

Title:
  Bitmap allocator returns duplicate entries

Status in ceph package in Ubuntu:
  Won't Fix
Status in ceph source package in Bionic:
  Won't Fix

Bug description:
  There is a known issue where ceph commit latency can increase over
  time [0], and the "fix" is to move to the new Nautilus bitmap
  allocator back-ported in 12.2.12 [1].

  It has been brought to my attention that one encountered a bug with
  the nautilus bitmap allocator [2] that brought down their cluster.
  This was due to a double-extent allocation which has been fixed and
  back-ported to Luminous, but is targeted for 12.2.13.

  Would be good to add it into our Ubuntu ceph package(s) where it
  applies to get ahead of the op commit latency problem.

  The bug is reported upstream and being discussed here [3] [4].

  [0] http://tracker.ceph.com/issues/38738 
  [1] https://www.mail-archive.com/ceph-users@lists.ceph.com/msg53793.html 
  [2] http://lists.ceph.com/pipermail/ceph-users-ceph.com/2019-July/035799.html 
  [3] https://tracker.ceph.com/issues/40080 
  [4] https://github.com/ceph/ceph/pull/28644

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