Thorsten Meinl created QPID-8571:
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Summary: Non-unique consumer tags created for AMPQ 0-9-1
Key: QPID-8571
URL: https://issues.apache.org/jira/browse/QPID-8571
Project: Qpid
Issue Type: Bug
Components: Broker-J
Affects Versions: qpid-java-broker-8.0.2
Reporter: Thorsten Meinl
The AMQP 0-9-1 specification states that the broker creates a unique consumer
tag upon {{consume}} when the client provides an empty consumer tag. The tags
are unique per channel.
However, Qpid creates non-unique tags when consumers target different queues.
In our case two consumers created via the same channel for two different queues
both have the same auto-generated tag {_}sgen_1{_}. This becomes an issue
during auto-recovery using the RabbitMQ Java client. It has an internal map
with consumer tags as keys that is used during auto-recovery. Now, if two
consumers get the same tag from the broker the second consumer will override
the first consumer and thus will not get restored.
Looking at the management console it seems that internally the consumer tags
are unique, e.g. _0|1|sgen_1_ but the reply to {{consume}} sent to the client
only contains {_}sgen_1{_}.
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