Comment 8 for bug 1551667

I can confirm this problem exists with oslo.messaging 2.5.0 and 3.0.0. In my case there was network problem that prevented ceilometer-collector/oslo.messaging from processing messages for few days till I noticed it was down. After this period I have over one million messages waiting to be processed, but when trying to run collector, it will try to read all messages till OOM kills its process. I could simply purge queue with messages (its only testing environment), but this could be much more serious problem if that happened in production where you don't want to loose samples...

I use ceilometer 5.0.2 with RabbitMQ for messages (liberty). I tried oslo.messaging 2.5.0 (default version for liberty) and 3.0.0, I will also try 4.* versions, but I need to figure out how to deal with dependencies first.