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

[dongdong tao]

** Description changed:

-     When we are activating we may receive several service map updates
-     initiated by the previous active mgr. Treat them all as initial map.
+ When we are activating we may receive several service map updates
+ initiated by the previous active mgr. Treat them all as initial map.
+ Unexpected assert will hit when there are more than one service map are received by the new active mgr
  
-     The code also adds "pending_service_map_dirty == 0" assert, which we
-     expect is true when receiving an initial map -- otherwise we can't
-     just initialize pending_service_map with received map.
+ Fixes: https://tracker.ceph.com/issues/51835
  
-     Fixes: 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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https://bugs.launchpad.net/bugs/2019293

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

Status in ceph package in Ubuntu:
  New

Bug description:
  When we are activating we may receive several service map updates
  initiated by the previous active mgr. Treat them all as initial map.
  Unexpected assert will hit when there are more than one service map are received by the new active mgr

  Fixes: 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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