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https://issues.apache.org/jira/browse/QPID-8571?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17922449#comment-17922449
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Robert Godfrey commented on QPID-8571:
--------------------------------------
I apologies that there has been no response to this in over 3 years :( Looking
at the code and taking your comment that this occurs {quote}on auto-recovery
using the RabbitMQ Java client{quote} - I do see an issue in the AMQP 0-x code
here, that if the client provides a {{BasicConsume}} with a consumer tag
(rather than relying on a server generated one), then at a later point a new
consumer is created with no tag (i.e. asking the Broker to generate one) then
the broker will likely create a tag that matches the tag that was used by the
client based on a server generate tag in the previous iteration of the
connection. On the off chance that you (or anyone else) is still running into
this issue, I'll make a fix presently
> 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
> Assignee: Robert Godfrey
> Priority: Major
>
> 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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