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

[James Page]

Hello Mehdi, or anyone else affected,

Accepted python-oslo.messaging into liberty-proposed. The package will
build now and be available in the Ubuntu Cloud Archive in a few hours,
and then in the -proposed repository.

Please help us by testing this new package. To enable the -proposed
repository:

  sudo add-apt-repository cloud-archive:liberty-proposed
  sudo apt-get update

Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-liberty-needed to verification-liberty-done. If it
does not fix the bug for you, please add a comment stating that, and
change the tag to verification-liberty-failed. In either case, details
of your testing will help us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in
advance!

** Also affects: cloud-archive/liberty
   Importance: Undecided
       Status: New

** Changed in: oslo.messaging (Ubuntu Vivid)
       Status: New => Won't Fix

** Changed in: cloud-archive/liberty
       Status: New => Fix Committed

** Tags added: verification-liberty-needed

-- 
You received this bug notification because you are a member of Ubuntu
Sponsors Team, which is subscribed to the bug report.
https://bugs.launchpad.net/bugs/1521958

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 oslo.messaging package in Ubuntu:
  Invalid
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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/cloud-archive/+bug/1521958/+subscriptions