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From " (JIRA)" <>
Subject [jira] Created: (AMQ-1062) Closing consumer does not free server memory, server heap overflows
Date Sun, 19 Nov 2006 22:33:02 GMT
Closing consumer does not free server memory, server heap overflows

                 Key: AMQ-1062
             Project: ActiveMQ
          Issue Type: Bug
          Components: Broker
    Affects Versions: 4.2.0
         Environment: Windows XP Professional, Java HotSpot(TM) Client VM version 1.5.0_09-b01
            Priority: Critical
             Fix For: 4.2.0

I am using the store durable pending cursor.

Create a producer for a topic and let it run continuously for the remainder of the test.
Create a durable consumer and kill it immediately.  (So now messages are piling up for the
consumer, but memory usage is low thanks to the store cursor.)
Wait a few minutes.
Now, start the same durable consumer again.
Memory usage will increase considerably at this point (I get it around 20%).
Now, stop the consumer.
Memory usage DOES NOT go down.
Now, reconnect the same durable consumer.  It is possible to get a heap overrun that nukes
the server!

This is a problem when there are many consumers, and  the general use case is that many of
them are not active at the same time.  I am classifying this as "critical bug" due to the
heap overflow whenI try to reconnect, but it would be great if the memory usage went down
as soon as disconnect.

I image there may also be problems like this with queues, but did not test.

2006-11-19 17:24:20,015 [/] DEBUG PrefetchSubscription           - Prefetch
2006-11-19 17:24:21,281 [/] DEBUG Service                        - Error occured
while processing sync command: java.lang.OutOfMemoryError: Java heap space
java.lang.OutOfMemoryError: Java heap space

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