** Description changed: + [Description] + RabbitMQ supports queue-level TTLs as described here: https://www.rabbitmq.com/ttl.html#queue-ttl This should be used when declaring queues in order to clean up queues that are orphaned for various reasons. This is an important complement to auto_delete queues. Queues marked auto_delete are only deleted if a consumer existed at some point, and then disconnected, resulting in zero consumers. + [Impact] + Consider the following scenario: a client declares a queue (auto_delete) - and binds it to a fanout exchange, but before the client can consume + and binds it to a fan out exchange, but before the client can consume from the queue, it dies. Because there was never (and will never be) a consumer of this queue, the auto_delete logic does not fire. The queue will live forever, and will collect a copy of every message that is sent to the bound fanout exchange. Given enough published messages to the exchange, the queue will eventually consume all available memory on the broker. This is bad and we should avoid it by setting a reasonable TTL. + + [Test Case] + + * Deploy a new cinder service unit + * Create a volume + * Destroy the new cinder service unit. + * List the current active queues: + + rabbitmqctl -p openstack list_queues messages consumers name + + 811 0 q-agent-notifier-security_group update_fanout_c3c4f4d4fc774322938357952ab6d252 + 3352 0 cinder-volume_fanout_49a14d5511dc4c8c935904eb299a06a8 + 3352 0 cinder-volume_fanout_634a3e584c064a788676fb29fbf7db23 + 3352 0 cinder-volume_fanout_ada4f2368cb74d7389998d0adbd15f88 + 3352 0 cinder-volume_fanout_e896e25b029c4cbd97037909c34803db + + Those queues with 0 consumers will grow and remain there forever. + + After applying the patch, those queues are removed from the exchange after + 10 minutes. + + + [Regression Potential] + + * Not identified.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1515278 Title: [SRU] rabbit queues should expire when unused To manage notifications about this bug go to: https://bugs.launchpad.net/oslo.messaging/+bug/1515278/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
