On 10/14/2014 09:39 AM, Sandy Walsh wrote:
Sort of.
Openstack RPC-over-AMQP (oslo.messaging) automatically ack()'s all
messages that are received. So, it becomes the responsibility of the
sender to retry. For example, the scheduler in Nova does this. However,
if the client fails before getting the message, AMQP will automatically
requeue it and send it to another client. But that's an unlikely
occurrence as it's queue-per-host so there wouldn't be a second client.
Therefore, queues should be configured to be durable.
Oddly, the default in oslo.messaging is for them to not be durable.
And as Gordon pointed out, queues are auto-deleted leading to this bug:
https://bugs.launchpad.net/oslo.messaging/+bug/1349301
And then there are issues about who should re-create queues on amqp
server failover:
https://bugs.launchpad.net/oslo.messaging/+bug/1338732
Chris
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