[Bug 2019293] Re: mgr: relax "pending_service_map.epoch > service_map.epoch" assert

[Andreas Hasenack]

Hello dongdong, or anyone else affected,

Accepted ceph into focal-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/ceph/15.2.17-0ubuntu0.20.04.5 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, what testing has been
performed on the package and change the tag from verification-needed-
focal to verification-done-focal. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-focal. 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 Focal)
       Status: New => Fix Committed

** Tags added: verification-needed verification-needed-focal

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https://bugs.launchpad.net/bugs/2019293

Title:
  mgr: relax "pending_service_map.epoch > service_map.epoch" assert

Status in ceph package in Ubuntu:
  Invalid
Status in ceph source package in Focal:
  Fix Committed

Bug description:
  [Impact]

  This issue has been observed from ubuntu Octopus release. 
  An assert will be triggered during the mgr fail-over process if the new active one unexpectedly received two continuous service map update. 
  The upstream fix has relaxed the assert condition to allow the new active mgr to receive multiple service map update in a fail-over scenario. 

  [Test Case]

  1. Deploy a 15.2.16 ceph cluster

  2. upgrade it to 15.2.17, inject multiple service map to the monitor

  3. stop the active mgr

  4. observe the new active mgr will hit the assert condition

  
  [Potential Regression]
  The new active mgr would be required to process multiple service map, it might slow down a little bit on the fail-over process, but still much better than crash.


  [Other info]

  Upstream bug tracker: https://tracker.ceph.com/issues/51835
  Upstream PR: https://github.com/ceph/ceph/pull/45984
  we need to backport it to octopus

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