[Bug 1919289] [NEW] OSDMapMapping does not handle active.size() > pool size

[dongdong tao]

Public bug reported:

If the pool size is reduced, we can end up with pg_temp mappings that are
too big.  This can trigger bad behavior elsewhere (e.g., OSDMapMapping,
which assumes that acting and up are always <= pool size).

** Affects: ceph (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1919289

Title:
  OSDMapMapping does not handle active.size() > pool size

Status in ceph package in Ubuntu:
  New

Bug description:
  If the pool size is reduced, we can end up with pg_temp mappings that are
  too big.  This can trigger bad behavior elsewhere (e.g., OSDMapMapping,
  which assumes that acting and up are always <= pool size).

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