[
https://issues.apache.org/jira/browse/AMQ-5598?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14351565#comment-14351565
]
Timothy Bish commented on AMQ-5598:
-----------------------------------
No, the MQTT code does not move through the AMQP code. There are issues with
the legacy AMQP 1.0 JMS client that we use for testing, some of which are fixed
in the upcoming 0.32 release but in general that client is not heavily
maintained or tested. The is a new one in the works that myself and
[~gemmellr] are working on which will be compliant with the JMS over AMQP
mapping spec we are also working on. Once there is an initial release of that
we will probably switch ActiveMQ to using that in its tests to resolve those
problems.
> MQTT+NIO+SSL: Concurrent connections lead to 100% CPU usage
> -----------------------------------------------------------
>
> Key: AMQ-5598
> URL: https://issues.apache.org/jira/browse/AMQ-5598
> Project: ActiveMQ
> Issue Type: Bug
> Components: MQTT
> Affects Versions: 5.10.0, 5.11.0
> Environment: Red Hat Enterprise Linux Server release 6.6 (Santiago),
> Open JDK 64bit 1.7.0.75, 3Gig RAM, 30Gig HDD - 1x ActiveMQ 5.10
> Windows 7 x64, Java 64bit 1.7.0, 8Gig RAM, 1x ActiveMQ 5.10, 1x ActiveMQ 5.11
> Reporter: Josef Awad
> Labels: performance, security
> Attachments: Screen Shot 2015-02-12 at 8.31.58 PM.png
>
>
> Connecting with multiple instances of mqtt clients via ssl at the same time
> causes the borker server to run on 100% CPU usage forever. Only restart of
> ActiveMQ helps. Thread count maximizes during connection attempt.
> Critical: It doesn't matter if the certificate is valid or not, I am able to
> shut down the broker from one client with 500 concurrent connecting
> instances. The payload size is not important. The problem is somewhere at the
> ssl handshake located. Without ssl everything works fine. Single ssl
> connections work.
> Similar issues (with older versions) described are here:
> -
> http://activemq.2283324.n4.nabble.com/SSL-handshake-stalls-broker-with-NIO-td4677916.html
> -
> http://stackoverflow.com/questions/19395769/activemq-mqtt-maxes-cpu-on-first-client-connect
>
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
