Jaroslav Sedlacek created AMQ-5663:
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Summary: Memory leak in message batching
Key: AMQ-5663
URL: https://issues.apache.org/jira/browse/AMQ-5663
Project: ActiveMQ
Issue Type: Bug
Affects Versions: 5.10.0
Reporter: Jaroslav Sedlacek
Memory leak in peristent message batching (Queue.massages.persistent.batchList)
caused by inconsistent "cacheEnabled" flag handling.
When AMQ is started and queue has more messages then
maxPageSize/maxExpirePageSize/maxBrowsePageSize, then cacheEnabled flag stays
"false" and no additional message is stored in batchList.
If queue has less messages than that, cacheEnabled is set to "true" and it is
set to true only when AMQ has no more space (see
AbstractPendingMessageCursor.hasSpace() - by default 70% of heap). It means
batchList can grow significantly in this case.
This behaviour was noticed on DLQ kind of queue with no consumer when a big
bunch of messages was added and it caused OOM.
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