[Bug 1521958] Re: rabbit: starvation of connections for reply

[Corey Bryant]

Hi Chris and James,

python-oslo.messaging 2.5.0-1ubuntu2 has been verified on wily-proposed
and trusty-liberty-proposed.

Thanks,
Corey

** Tags removed: verification-liberty-needed verification-needed
** Tags added: verification-done verification-liberty-done

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Title:
  rabbit: starvation of connections for reply

Status in Ubuntu Cloud Archive:
  Invalid
Status in Ubuntu Cloud Archive juno series:
  New
Status in Ubuntu Cloud Archive liberty series:
  Fix Committed
Status in oslo.messaging:
  Fix Released
Status in python-oslo.messaging package in Ubuntu:
  Invalid
Status in oslo.messaging source package in Trusty:
  New
Status in oslo.messaging source package in Vivid:
  Won't Fix
Status in python-oslo.messaging source package in Wily:
  Fix Committed

Bug description:
  Hi,

  When a client died/restart/stop but was waiting more replies that the rpc_connection_pool size,
  the server will hold all connections from the pool during the retry logic in case of the client come back with the same reply_queue_id (that occurs only is rabbit is restart, not the client).

  Cheers,

  
  ---------------------------

  [Impact]

  This patch addresses an issue when multiple clients lost
  networks/died/restart/stop, the server will hold all connections from
  the pool(rpc_connection_pool size) during the retry logic in case of
  the client come back with the same reply_queue_id (that occurs only is
  rabbit is restart, not the client), and which cause nova-conductor
  infinitely reconnects to rabbit if large nova-compute hosts are
  deployment until all of the connections of the old reply messages are
  expired, for the quite large scaled cloud, high availability is
  broken.

  [Test Case]

  Note steps are for trusty-icehouse, including latest oslo.messaging
  library (1.3.0-0ubuntu1.2 at the time of this writing).

  Deploy an OpenStack cloud w/ multiple rabbit nodes and multiple nova
  compute hosts then cut off the network between OpenStack services and
  RabbitMQ. Observe that the nova-conductor is infinitely reconnecting
  to rabbit nodes.

  [Regression Potential]

  None.

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