Francesco Nigro created ARTEMIS-3444:
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Summary: Paging cache entries are not evicted although eligible
for GC
Key: ARTEMIS-3444
URL: https://issues.apache.org/jira/browse/ARTEMIS-3444
Project: ActiveMQ Artemis
Issue Type: Improvement
Reporter: Francesco Nigro
Assignee: Francesco Nigro
Artemis Paging cache is using SoftValueLongObjectHashMap to collect page cache
entries.
Soft references become eligible to be collected by JVM according to
-XX:SoftRefLRUPolicyMSPerMB configuration and it affects when broker can remove
such entries from the mentioned SoftValueLongObjectHashMap too.
The mechanism that allow broker to remove any pending memory is by processing
the ref queue filled by the JVM, but it's going to happen only if there's any
interaction with the page cache (size/put/remove/get/iteration), and that means
that if there are no interactions, the broker won't remove such entries and the
related reference queue will grow larger and larger, leading to huge GC
reference processing pauses.
The paging cache should be able to remove such entries as soon as the JVM
enqueue them on the map ref queue, instead.
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