PooledSession - Can cause memory leak in case many consumers is created by the
session
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Key: AMQ-3588
URL: https://issues.apache.org/jira/browse/AMQ-3588
Project: ActiveMQ
Issue Type: Bug
Components: activemq-camel
Reporter: Claus Ibsen
Assignee: Claus Ibsen
Priority: Critical
Fix For: 5.6.0
Attachments: before.png
See (CAMEL-4657
In the activemq-pool we have a memory leak when a PooledSession is used to
create many consumers. As each consumer is added to an internal list, which in
case the session is closed, the list is used to ensure all previously created
consumers gets closed as well.
However if the session is used to create many consumers, then that internal
list just keep growing, and causing OOME. See attached screenshots of a before
vs after with the bug fix.
So to remedy this situation, we should ensure any closed consumer gets removed
from that internal list. As its already closed, and therefore the session do
not need to keep track of it anymore.
This bug have existed ever since AMQ-615.
The impact of this bug can be seen in CAMEL-4657, which essentially makes using
Camel for request/reply over JMS with AMQ and with named replyTo queues (eg not
temporary) will cause this problem. The problem manifests due Spring DMLC,
which uses a MessageSelector to only pickup expected reply messages. And
because the MessageSelector is created once when the consumer is created. We
need to create a new Consumer, every time a new message is doing request/reply,
to ensure the Message Selector gets updated. So in that situation many
consumers get created, which leads to OOME as the list in PooledSession keeps
growing.
It would be great if this bug fix can be backported to the 5.5 branch as well.
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