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https://issues.apache.org/jira/browse/PROTON-2956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18123950#comment-18123950
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ASF subversion and git services commented on PROTON-2956:
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Commit 7ef957115006b73c51f0aff0868e8144fb71adad in qpid-protonj2's branch
refs/heads/1.x from Daniil Kirilyuk
[ https://gitbox.apache.org/repos/asf?p=qpid-protonj2.git;h=7ef95711 ]
PROTON-2956 Delivery tag at pool index 256 is not unique
(cherry picked from commit 159bad569405482cf0d80395400f533a1f5f647c)
> [protonj2] Pooled delivery-tag generator emits duplicate tags when more than
> 256 tags are checked out
> -----------------------------------------------------------------------------------------------------
>
> Key: PROTON-2956
> URL: https://issues.apache.org/jira/browse/PROTON-2956
> Project: Qpid Proton
> Issue Type: Bug
> Components: protonj2
> Affects Versions: protonj2-1.3.0
> Reporter: Daniil Kirilyuk
> Assignee: Timothy A. Bish
> Priority: Minor
> Fix For: protonj2-1.4.0
>
>
> {{ProtonPooledTagGenerator}} has a default pool size of 512, but truncates
> each pooled tag ID to a Java {{byte}} when constructing the tag:
> {code:java}
> new ProtonPooledDeliveryTag((byte) nextTagId++).checkOut();{code}
> This produces only 256 distinct AMQP delivery-tag byte values.
> When sending pressure causes more than 256 pooled tags to be checked out
> concurrently, ProtonJ2 can therefore send a new delivery using the same tag
> as an existing unsettled delivery.
> AMQP 1.0 requires a delivery tag to be unique among all deliveries that
> either end of the link could consider unsettled. A conforming peer can
> consequently detach the link with {_}Delivery-tag 'X' is used by another
> unsettled delivery{_}.
> This seems to be the root cause of QPID-8599.
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