I'm experiencing a problem with mirrored queue synchronization, and I'm trying to determine if there's a bug or I'm just not understanding something.
Our setup:
- RabbitMQ 2.71 on 64-bit Ubuntu 10.04.
- Three brokers with all queues mirrored
- Web Management plugin installed
We typically have five queues defined, all mirrored. If I observe them in the "Queues tab" of the Management UI, they all have a green "+2" after the Node name. They're all mastered on the same Node.
None of these queues have any messages, and there are no clients connected, sending or receiving messages.
If I stop one of the brokers, all the "+2"s become "+1", as expected. However, when I restart the broker a couple of seconds later, some subset of the queues (varies from run to run) go back to "+2", while the remaining queues switch to "+1 +1", meaning 1 synched, and 1 unsynched.
Given that there are no messages in the queue, I don't understand why some queues don't synch back up properly.
Also, I've looked at the sync status of the queues in rabbitmqctl, and the results seem consistent with what the HTTP API reports.
Matt
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