Flavio Baronti created QPID-7720:
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Summary: Java client hangs when publishing to C++ broker queue
with flow control activated
Key: QPID-7720
URL: https://issues.apache.org/jira/browse/QPID-7720
Project: Qpid
Issue Type: Bug
Components: Java Common
Affects Versions: qpid-java-6.1.1
Reporter: Flavio Baronti
This is probably the same as QPID-4073.
When a C++ flow controlled queue is overfull, the broker stops sending
acknowledgements to client commands. This causes the internal command queue of
the client to become full.
In this situation, the client sends a flush request, then waits for the
internal queue to free some space. Unfortunately, the broker will answer to the
flush request with an empty response, and will not send anything else when the
queue becomes underfull again. Thus the client dies with a timeout.
I suggest a patch which sends again the flush command every 500ms, up to the
configured timeout. If the queue becomes underfull within the timeout, the
broker will answer with a non-empty response, and the client will restart
processing.
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