Philip Harvey created QPID-3980:
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Summary: Last value queue - entries replaced by conflation are
never deleted, causing memory leak
Key: QPID-3980
URL: https://issues.apache.org/jira/browse/QPID-3980
Project: Qpid
Issue Type: Bug
Components: Java Broker
Affects Versions: 0.16
Reporter: Philip Harvey
This issue was uncovered while investigating QPID-3979.
The conflation behaviour of last value queues appears correct from the
perspective of consumers. However, the message count suggests that conflation
is *not* occurring.
I checked what happens when ConflationQueueList.add(..) is replacing an
existing ConflationQueueEntry. ConflationQueueList calls acquire() on the entry
and then tries to discard it. The discard does nothing because it tries again
to acquire the message. Therefore, the message stays in the list, causing a
memory leak.
Because the message has been acquired, it is not delivered to consumers - that
is why everything appears to work correctly from their point of view.
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