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https://issues.apache.org/jira/browse/QPID-8599?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Daniil Kirilyuk resolved QPID-8599.
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Resolution: Not A Bug
Issue fixed by [PROTON-2956|https://issues.apache.org/jira/browse/PROTON-2956]
> [Broker-J] Client receives `Delivery-tag '%s' is used by another unsettled
> delivery.` for already settled tag
> -------------------------------------------------------------------------------------------------------------
>
> Key: QPID-8599
> URL: https://issues.apache.org/jira/browse/QPID-8599
> Project: Qpid
> Issue Type: Bug
> Components: Broker-J
> Affects Versions: qpid-java-broker-8.0.6
> Reporter: Marco Geri
> Assignee: Daniil Kirilyuk
> Priority: Major
>
> Using ProtonJ2 client sender with Delivery Mode AT_LEAST_ONCE, i.e.:
> * Sender Settle Mode: Unsettled
> * Receiver Settle Mode: First
> * Pooled tag generator: when receiving a remote settle, a tag is pooled for
> reuse in a next delivery
> * Auto settle enabled: when receiving a remote settle, it settles the
> delivery
> During some sending peaks, sometimes the client receives the server error:
> _Delivery-tag 'X' is used by another unsettled delivery._
> I don't know in detail how it works (sorry if I'm wrong), but with some
> debugging, it seems to happen something similar to this example:
> * the client sends two delivery messages with tags "10" and "11"
> * the client receives the remote settle and puts tags "10" and "11" to
> reusable pooled tags
> * meanwhile, a new message is ready to be delivered and the client sends in
> this sequence the following messages: settle tag "10", settle tag "11", a new
> delivery message with tag "10" (reusing the "10" tag)
> When the BrokerJ receives this sequence it seems it processes all the
> messages on the on "receive complete" event, with the
> {{processPendingDispositions.}}
> But before doing it, it seems that it checks for an already used tag on a
> single receive, although if there is a "client settle message" for the tag
> "10" in the pending dispositions, it finds the tag "10" in the unsettled set
> collection (ignoring that it will be removed from it in the "process pending
> disposition"), giving the "Delivery `10` tag is used ..." error.
> I'm not an AMQP and BrokerJ expert and I don't know if I'm missing something
> and this is expected behavior and if the problem should be resolved on the
> client side.
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