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["Davanum Srinivas \(DIMS\)" <davanum@xxxxxxxxx>]

Is this because of how oslo.messaging is implemented or how nova uses
oslo.messaging?

** Also affects: oslo.messaging
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1437902

Title:
  nova redeclares the `nova` named exchange zillion times without a real
  need

Status in OpenStack Compute (Nova):
  New
Status in Messaging API for OpenStack:
  New

Bug description:
  The AMQP broker preserves the exchanges, they are replaced to all broker even in non HA mode.
  A transient exchange can disappear ONLY when the user explicitly requests it's deletion or when the full rabbit cluster dies.

  More efficient to declare exchanges only when it is really missing.

  Application MUST redeclare the exchange when it was reported as Not Found.
  Note.: The Channel exceptions causes channel termination, but not connection termination.
  Application MAY try to redeclare the exchange on connection breakage, it can assume the messaging cluster  dead.
  Application SHOULD redeclare the exchange at application start up to verify the attributes (Before the first usage).
  Application does not needs to redeclare the exchange in any other cases.

  Now, significant amount of the AMQP request/response-es is
  Exchange.Declare -> Exchange.Declare-Ok. (One per publish?)

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