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From "John Heitmann (JIRA)" <j...@apache.org>
Subject [jira] Created: (AMQ-932) Quickly broken client connections lead to memory leaks
Date Thu, 21 Sep 2006 07:21:23 GMT
Quickly broken client connections lead to memory leaks
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                 Key: AMQ-932
                 URL: https://issues.apache.org/activemq/browse/AMQ-932
             Project: ActiveMQ
          Issue Type: Bug
          Components: Broker
    Affects Versions: 4.0.2
            Reporter: John Heitmann
         Attachments: 73.diff

Connections to the openwire port that are pathologically broken (for example any http request)
or that die in some other way extremely quickly will lead to memory losses of aout 64Kb each
time. This happens because many services are stop()ed directly in the middle of start(), and
then never stopped for real, or stopped again but on an object tree with an inconsistent state.
This is usually also accompanied by the JMX message:

WARN  ManagedTransportConnection     - Failed to unregister mbean: org.apache.activemq:BrokerName=localhost,Type=Connection,ConnectorName=default,Connection=25

But that is a cosmetic symptom and not critical (and this has otherwise nothing to do with
JMX).

My patch is a band-aid that is functional but I'm not very happy with it. The patch changes
some service logic so that if stop is called in the middle of start, the stop is instead queued
and called at the end of start. There will still be multiple stops, and you'll still see the
cosmetic JMX error from the second ineffectual stop, but the first stop cleans up correctly
so there are no leaks.

I think there's probably a better solution, but it was tough to see what. I'd appreciate better
ideas. Possibly something involving moving the dangerous operations (wire format negotiation
etc) out of start?

I am working on a unit test, but I can't promise I will have something to submit. I'm having
to play JVM games to detect the problem in a unit test and that might not fly for general
purpose use.

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