activemq-flow: SharedQueue cursoring/paging enhancements -- updated queue to
enforce a memory limit less than the queue's max size
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Key: AMQ-2236
URL: https://issues.apache.org/activemq/browse/AMQ-2236
Project: ActiveMQ
Issue Type: Improvement
Components: Broker
Affects Versions: incubation
Environment: N/A
Reporter: Colin MacNaughton
Fix For: incubation
This improvement updates the cursoring logic in shared queue to allow
enforcement of a memory limit that is separate from the queue's size limit. If
the queue is configured to limit memory then each cursor now additionally gets
a memory limiter/controller. When elements are added to the queue open cursors
are checked to see if they can absorb the element in memory -- if not the
element is paged out to disk.
This is still a work in progress -- the implementation is still a bit buggy,
and it needs to be further enhanced to throttle back producers to avoid
constantly paging out/in elements once the queue's cursors have caught up to
the live delivery stream.
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