Queens Series Release Notes


Known Issues

  • A bug in the amqp python library can cause the connection to the RabbitMQ broker to hang when using SSL/TLS. This results in frequent errors such as this:

    MessagingTimeout: Timed out waiting for a reply to message ID ae039d1695984addbfaaef032ce4fda3

    (see bug 1800957).

    This bug has been fixed in v2.4.1 of amqp.

    It is recommended that deployments using SSL/TLS upgrade the amqp library to v2.4.1 or later.


Other Notes

  • On rabbitmq, in the past, acknownlegement of messages was done within the application callback thread/greenlet. This thread was blocked until the message was ack. In newton, we rewrote the message acknownlegement to ensure we haven’t two threads writting the the socket at the same times. Now all pendings ack are done by the main thread. They are no more reason to block the application callback thread until the message is ack. Other driver already release the application callback threads before the message is acknownleged. This is also the case for rabbitmq, now.


Upgrade Notes

  • Change the default value of RPC dispatcher access_policy to DefaultRPCAccessPolicy.