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[Brian Elliott <bdelliott@xxxxxxxxx>]

Public bug reported:

Cells has a rpc driver for inter-cell communication.  A
oslo.messaging.Transport is created for each inter-cell message.

In previous versions of oslo.messaging, connection pool references were
maintained within the RabbitMQ driver abstraction in oslo.messaging.  As
of oslo.messaging commit f3370da11a867bae287d7f549a671811e8b399ef, the
application must maintain a single reference to Transport or references
to the connection pool will be lost.

The net effect of this is that cells constructs a new broker connection
pool  (and a connection) on every message sent between cells.  This is
leaking references to connections.

** Affects: nova
     Importance: Undecided
     Assignee: Brian Elliott (belliott)
         Status: In Progress

** Changed in: nova
     Assignee: (unassigned) => Brian Elliott (belliott)

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https://bugs.launchpad.net/bugs/1417745

Title:
  Cells connecting pool tracking

Status in OpenStack Compute (Nova):
  In Progress

Bug description:
  Cells has a rpc driver for inter-cell communication.  A
  oslo.messaging.Transport is created for each inter-cell message.

  In previous versions of oslo.messaging, connection pool references
  were maintained within the RabbitMQ driver abstraction in
  oslo.messaging.  As of oslo.messaging commit
  f3370da11a867bae287d7f549a671811e8b399ef, the application must
  maintain a single reference to Transport or references to the
  connection pool will be lost.

  The net effect of this is that cells constructs a new broker
  connection pool  (and a connection) on every message sent between
  cells.  This is leaking references to connections.

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