CPP Broker allows credit window to exceed the request size.
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Key: QPID-3629
URL: https://issues.apache.org/jira/browse/QPID-3629
Project: Qpid
Issue Type: Bug
Components: C++ Broker
Affects Versions: 0.14
Reporter: Keith Wall
Investigation of QPID-2703 revealed that the CPP Broker can be made to extend
the window size beyond that requested by the client's message.flow command.
To reproduce the problem, the client must perform the following steps:
1) Receive messages
2) Perform message stop
3) Perform message flow
4) Complete messages received by step 1)
5) Observe the window is the sum of that requested by step 3 + the recredit of
messages from 1)
The window handling behaviour of the CPP Broker was the reason that QPID-2703
was not apparent against the CPP Broker but was against the Java Broker which
does not expand the window in this way.
The attached Python test demonstrates the issue by receiving more uncompleted
message commands than the window should allow. Obviously it can be argued that
the python test does not have the expected order of commands, but there is
nothing stopping a client from performing such a sequence (e.g. the Qpid Java
Client) so the broker should enforce the requested window size regardless.
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