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From "Arthur Naseef (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AMQ-5598) MQTT+NIO+SSL: Concurrent connections lead to 100% CPU usage
Date Wed, 22 Apr 2015 05:33:58 GMT

    [ https://issues.apache.org/jira/browse/AMQ-5598?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14506456#comment-14506456
] 

Arthur Naseef commented on AMQ-5598:
------------------------------------

I see - thank you for the clarification.  MQTT and AMQP are still vague in my mind and hence
I lump them together - I need to find time to learn them.

> 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
>  



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