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From "Josef Awad (JIRA)" <>
Subject [jira] [Created] (AMQ-5598) MQTT+NIO+SSL: Concurrent connections lead to 100% CPU usage
Date Thu, 19 Feb 2015 11:39:11 GMT
Josef Awad created AMQ-5598:

             Summary: MQTT+NIO+SSL: Concurrent connections lead to 100% CPU usage
                 Key: AMQ-5598
             Project: ActiveMQ
          Issue Type: Bug
          Components: MQTT
    Affects Versions: 5.11.0, 5.10.0
         Environment: Red Hat Enterprise Linux Server release 6.6 (Santiago), Open JDK 64bit, 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

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:



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