Daniil Kirilyuk created PROTON-2956:
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Summary: [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: protonj2-2.0.0
Reporter: Daniil Kirilyuk
Assignee: Timothy A. Bish
{{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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