oslo.messaging/releasenotes/notes/rabbit-no-wait-for-ack-9e5d...

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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.