[Bug 1978913] Re: [SRU] ceph-osd takes all memory at boot

[nikhil kshirsagar]

Attached octopus backport of https://github.com/ceph/ceph/pull/47046.
This is for merge into 15.2.17 point release.

I have built it into the 15.2.17 upstream branch, and tested and
validated that it fixes the issue in Octopus.

** Patch added: "1978913.patch"
   https://bugs.launchpad.net/ubuntu/+source/ceph/+bug/1978913/+attachment/5620269/+files/1978913.patch

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https://bugs.launchpad.net/bugs/1978913

Title:
  [SRU] ceph-osd takes all memory at boot

Status in Ubuntu Cloud Archive:
  New
Status in Ubuntu Cloud Archive queens series:
  New
Status in Ubuntu Cloud Archive ussuri series:
  New
Status in Ubuntu Cloud Archive wallaby series:
  New
Status in Ubuntu Cloud Archive xena series:
  New
Status in Ubuntu Cloud Archive yoga series:
  New
Status in ceph package in Ubuntu:
  New
Status in ceph source package in Bionic:
  New
Status in ceph source package in Focal:
  New
Status in ceph source package in Jammy:
  New
Status in ceph source package in Kinetic:
  New

Bug description:
  [Impact]
  ceph-osd takes all memory at boot

  [Test Plan]
  https://tracker.ceph.com/issues/53729

  [Where problems could occur]
  Trimming large clusters could be time consuming.

  [Other Info]
  The way this is fixed is that the PGLog needs to trim duplicates by the number of entries rather than the versions. That way, we prevent unbounded duplicate growth. 

  Reported upstream at https://tracker.ceph.com/issues/53729 and fixed
  on master through https://github.com/ceph/ceph/pull/45529 and on
  octopus through https://github.com/ceph/ceph/pull/46253

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