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From "Brad Willard (JIRA)" <>
Subject [jira] Commented: (AMQ-2745) Deadlock or Performance Bottleneck when reading messages with Correlation
Date Fri, 10 Sep 2010 20:18:40 GMT


Brad Willard commented on AMQ-2745:

I wanted to confirm that this is still an issue in the 5.4 release.  I can do it with the
default properties file it ship with as well.  Increasing the maxPageSize in the policyEntry
seems to help the issue, but eventually the consumer on a separate correlation will lock up.

Any ideas, this is has prevented up from upgrading since 5.3.0.

> Deadlock or Performance Bottleneck when reading messages with Correlation
> -------------------------------------------------------------------------
>                 Key: AMQ-2745
>                 URL:
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: Broker
>    Affects Versions: 5.3.1, 5.3.2, 5.4.0
>         Environment: Java 64-bit, Windows 2008 Server, Centos 5 64bit,  Ubuntu 110 64-bit
>            Reporter: Brad Willard
>             Fix For: NEEDS_REVIEWED
>         Attachments: activemq.xml,,
> 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 or 5.3.2.  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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