[rabbitmq-discuss] connection and consumer counts all wrong

[Aaron Westendorf]

We're regularly able to break rabbits tracking of consumer counts on a
queue, such that it says "X consumers" whereas the reality is "X - N
consumers" where N>0. This seems to be triggered by disagreement as to
the state of sockets, likely caused by an unclean disconnect by a
client. This could be caused by any number of things, such as
rebooting on of our client VMs or maybe just a connection drop inside
our providers network (a common and unwelcome event).

We've seen this problem on 2.5.1 + R14B01, and are continuing to see
it on 2.7.1 + R15B.  I can try to provide additional details on
request.

My concerns on consumer counts are two-fold. First, we have no way to
validate that num_procs==num_consumers, an important metric when
validating that our platform is running correctly. Second, we don't
know if rabbit is pushing messages to these ghost consumers, and if
so, what's happening to them.

-Aaron


-- 
Aaron Westendorf
Senior Software Engineer
Agora Games
359 Broadway
Troy, NY 12180
Phone: 518.268.1000
aaron at agoragames.com
www.agoragames.com