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From "Howard Orner (JIRA)" <j...@apache.org>
Subject [jira] Created: (AMQ-1711) IllegalArgumentException-Subscripiton does not exist when client disconnects
Date Tue, 06 May 2008 01:47:43 GMT
IllegalArgumentException-Subscripiton does not exist when client disconnects 
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                 Key: AMQ-1711
                 URL: https://issues.apache.org/activemq/browse/AMQ-1711
             Project: ActiveMQ
          Issue Type: Bug
    Affects Versions: 4.1.1
            Reporter: Howard Orner


When a client disconnects in a Network of Brokers configuration, it is possible for an IllegalArgumentException
to be thrown from org.apache.activemq.broker.region.AbstractRegion.acknowlege() due to a race
condition between message processing and disconnect subscription clean-up.  It is easily reproducable
by putting two brokers in a Network of Brokers configuration (We will call them A and B).
 If you publish message at a high rate to broker A (I found that if I published messages at
the rate of 1 every 10ms this happened consistantly -- better hardware may require a high
rate so I recommend pushing message as fast as possible), put a subscriber on broker B (my
subscriber used selectors but I don't think that makes a difference), and kill the subscriber
process (I don't know if a friendly disconnect behaves better), Broker A will throw an exception
and disconnect broker B perminately from the NOB configuration.  All future connections to
broker B will not received messages published to A.

I found that if I changed AbstractRegion.acknowledge to log the error, but not throw an exception
that it solved the problem with seemly no ill effects.  

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