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From "Colin MacNaughton (JIRA)" <j...@apache.org>
Subject [jira] Created: (AMQ-2236) activemq-flow: SharedQueue cursoring/paging enhancements -- updated queue to enforce a memory limit less than the queue's max size
Date Thu, 30 Apr 2009 02:51:41 GMT
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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