Robbie Gemmell created QPID-4557:
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Summary: [Java broker] producer flow control functionality can
retain sessions in the 'blocked' list longer than necessary, potentially
leading to excessive memory use
Key: QPID-4557
URL: https://issues.apache.org/jira/browse/QPID-4557
Project: Qpid
Issue Type: Bug
Components: Java Broker
Affects Versions: 0.20, 0.18, 0.16, 0.14, 0.12, 0.10, 0.8, 0.6
Environment: The producer flow control functionality can retain
sessions in the 'blocked' list longer than necessary, leading to eexcessive use
of memory.
Currently the sessions are only removed from the 'blocked' list they are placed
in when the queue depth exceeds the configrued 'capacity' at the point when the
queue depth goes below the 'flow resume capacity' again. If the queue never
does this, then sessions are never removed from the lsit and get retained. This
can lead to excessive memory uae where a session-per-message pattern is
occurring with the producers.
We should look to ensure that closed sessions can be released from memory
without requiring the queue becomes 'underfull' again, e.g by use of weak
references or some sort of notification.
Reporter: Robbie Gemmell
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