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https://issues.apache.org/jira/browse/QPID-8496?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17263834#comment-17263834
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Alex Rudyy commented on QPID-8496:
----------------------------------

Hi [~hlizza88],
Thanks for reporting this issue.
It looks like "unknown QBB implementation" error can occurs on receiving a 
transfer without a payload.
Could you please clarify why your application need to send transfers without 
payload?

The amqp spec allows no payload only on resuming a transfer. (As per section 
2.7.5 "Transfer", resume flag description). The resume functionality currently 
unsupported by the Broker.

It seems that Broker need to report a better error for a transfer without 
payload (something like amqp:not-implemented) and detach the link with an error.
Another alternative solution could be to actually allow transfers without 
payload, but I am strangling to find a business justification for such 
behaviour. 

Do you send transfers without payload on purpose?

Kind Regards,
Alex



> Randomly hit "unknown QBB implementation" error
> -----------------------------------------------
>
>                 Key: QPID-8496
>                 URL: https://issues.apache.org/jira/browse/QPID-8496
>             Project: Qpid
>          Issue Type: Bug
>          Components: Broker-J
>    Affects Versions: qpid-java-broker-8.0.2
>            Reporter: Lisa Hong
>            Priority: Major
>         Attachments: UnknownQBB_callstack
>
>
> Hi team, 
> I'm running qpid java broker with modelVersion8.0. And the client is 
> qpid-proton with python. Unfortunately, my producer will randomly hit this  
> "unknown QBB implementation" error thus failing with on_connection_error. 
> Could you please help to advice what could be the root cause? The error call 
> stack could be found from attachment.
> I'm suspending some null buffer is provided for this 
> QpidByteBufferFactory.concatenate method. But I have no idea why it could 
> happen. Would you please help to figure out? Thank you so much!
> Regards,
> Lisa



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