Hi, We've ran into some problems since we updated to Activemq 5.12.1. Our most busy queue has stuck messages which also do NOT expire. The queue has around 200 producers (each producer has it's own message group, making sure messages of a producer do not overtake each other) which send non-persistent messages with a timeout of 40 seconds. They produce around 20-30 msgs / second. 5 cached consumers exist.
Our problem is that all 5 consumers are consuming messages but some of those messages are apparently not delivered. They get stuck in the queue and stay there. They do not expire. The only solution to "clear" the queue is to use a QueueBrowser and inspect it. Once I connect with the QueueBrowser, all messages are apparently moved to expiration. After that the processing works for a couple of minutes until the messages start clogging up again. The consumers do not use any form of selector other than the JMS message group. The operation on the server side is very lightweight and the load on the server is low so i do not think that it's the fault of the server for not processing the messages fast enough (and they should at least time out after their expiration deadline is reached). The problem scales apparently with the amount of the producers / produced messages. Systems with ~100 producers have much fewer stuck messages. All our other queues use message groups as well but work as intended. A maybe noticable difference is that the messages that get stuck are non-persistent and have a TTL. We have some high-throughput queues with non-expiring, non-persistent messages, which do not show those symptoms. Good ideas on what could be the issues are very welcome! Thanks in advance! Best regards, Martin
