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From "Brad Willard (JIRA)" <>
Subject [jira] Created: (AMQ-2745) Deadlock or Performance Bottleneck when reading messages with Correlation
Date Fri, 21 May 2010 15:57:51 GMT
Deadlock or Performance Bottleneck when reading messages with Correlation

                 Key: AMQ-2745
             Project: ActiveMQ
          Issue Type: Bug
          Components: Broker
    Affects Versions: 5.3.1
         Environment: Java 64-bit, Windows 2008 Server
            Reporter: Brad Willard
            Priority: Minor

We have a situation where we are posting messages to a queue with two different correlation
ids specifically intended to reach two different clients who subscribe with message selectors
for the appropriate correlation.  The clients are reading with message listeners.  When one
client stops reading the expected behavior, and the behavior we saw on 5.3.0, is that the
messages with the correlation for the stopped client will backup on the queue and will not
effect the performance of the second client who is still reading the messages with the other
correlation.  With our memory config messages can backup into the hundreds of thousands before
noticing any performance impact on the active client.

However this is not the case in 5.3.1.  With 5.3.1 once enough messages backup for the stopped
client, suddenly the active client's performance drops drastically 20 ms reads to 30,000ms
reads.  We will see this within a few hundred messages.  I believe there is some kind of deadlock,
or buffering bottleneck that was introduced on the client side.

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