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From "Gary Tully (JIRA)" <j...@apache.org>
Subject [jira] Created: (AMQ-2610) expiry processing with file pending cursor and no consumers fills memory - causing producerFlowControll to kick in
Date Tue, 16 Feb 2010 13:06:40 GMT
expiry processing with file pending cursor and no consumers fills memory - causing producerFlowControll
to kick in
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                 Key: AMQ-2610
                 URL: https://issues.apache.org/activemq/browse/AMQ-2610
             Project: ActiveMQ
          Issue Type: Bug
          Components: Broker
    Affects Versions: 5.3.0
         Environment: all
            Reporter: Gary Tully
            Assignee: Gary Tully
             Fix For: 5.4.0


The Memory usage limits are shared for a filependingmessagecursor and a queue. To have the
cursor limit kick in first the usage portion needs to be reduced to below 70% as in: policy.setCursorMemoryHighWaterMark(50);
for the destination.
This causes message references to be flushed to disk when the memory utilization reaches 50%
ensuring that the memory usage limit for the queue of 70% is not met.

However, expiry processing with no consumers, needs to go directly to the cursor to examine
messages (as none are paged in for dispatch) and this contract is problematic at the moment
as there is no way to manage the message reference count via the cursor api for this use case.
PageInList is promising but not complete.

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