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From "Timothy Bish (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AMQ-5598) MQTT+NIO+SSL: Concurrent connections lead to 100% CPU usage
Date Fri, 06 Mar 2015 21:29:38 GMT

    [ https://issues.apache.org/jira/browse/AMQ-5598?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14350921#comment-14350921
] 

Timothy Bish commented on AMQ-5598:
-----------------------------------

I attempted to recreate this but could not.  Added a parallel connection test on master everything
seems to work as expected.

> 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
>
> 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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