QQ: fix bug when subscribing using an already existing consumer tag (backport #9158) (backport #9161) #9164
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When subscribing using a consumer tag that is already in the quorum queues state (but perhaps with a cancelled status) and that has pending messages the next_msg_id which is used to initialise the queue type consumer state did not take the in flight message ids into account. This resulted in some messages occasionally not being delivered to the clint and thus would appear stuck as awaiting acknowledgement for the consumer. When a new checkout operation detects there are in-flight messages we set the last_msg_id to `undefined` and just accept the next message that arrives, irrespective of their message id. This isn't 100% fool proof as there may be cases where messages are lost between queue and channel where we'd miss to trigger the fallback query for missing messages. It is however much better than what we have atm. NB: really the ideal solution would be to make checkout operations async so that any inflight messages are delivered before the checkout result. That is a much bigger change for another day. (cherry picked from commit 49108a6) (cherry picked from commit 0390886) # Conflicts: # deps/rabbit/src/rabbit_fifo_client.erl # deps/rabbit/test/rabbit_fifo_SUITE.erl
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This is an automatic backport of pull request #9161 done by Mergify.
Cherry-pick of 0390886 has failed:
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