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[Sergey Nikitin <snikitin@xxxxxxxxxxxx>]

Public bug reported:

When the 'to_delete' list of instance tags in db method
instance_tag_set() is empty, warnings are printed in the nova logs:

SAWarning: The IN-predicate on "tags.tag" was invoked with an empty
sequence. This results in a contradiction, which nonetheless can be
expensive to evaluate. Consider alternative strategies for improved
performance.

The fix is to not query the DB in that case.

** Affects: nova
     Importance: Undecided
     Assignee: Sergey Nikitin (snikitin)
         Status: New

** Changed in: nova
     Assignee: (unassigned) => Sergey Nikitin (snikitin)

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https://bugs.launchpad.net/bugs/1480226

Title:
  SAWarning: The IN-predicate on tags.tag was invoked with an empty
  sequence

Status in OpenStack Compute (nova):
  New

Bug description:
  When the 'to_delete' list of instance tags in db method
  instance_tag_set() is empty, warnings are printed in the nova logs:

  SAWarning: The IN-predicate on "tags.tag" was invoked with an empty
  sequence. This results in a contradiction, which nonetheless can be
  expensive to evaluate. Consider alternative strategies for improved
  performance.

  The fix is to not query the DB in that case.

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