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From "Sergei Sokolov (Created) (JIRA)" <jira+amq...@apache.org>
Subject [jira] [Created] (AMQNET-381) ActiveMQ.NMS hangs sometimes due t concurrency problems and static IDictionary
Date Mon, 16 Apr 2012 08:56:20 GMT
ActiveMQ.NMS hangs sometimes due t concurrency problems and static IDictionary
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                 Key: AMQNET-381
                 URL: https://issues.apache.org/jira/browse/AMQNET-381
             Project: ActiveMQ .Net
          Issue Type: Bug
          Components: NMS
    Affects Versions: 1.5.4
         Environment: Windows Server 2008
            Reporter: Sergei Sokolov
            Assignee: Jim Gomes
         Attachments: TransportFactory.cs.patch

I've found that rarely .NET process consumes ~90% CPU. I got the dump file and I found that
the problem is in Dictionary<>.FindEntry method:
{code}
2de9e5a4 71711819 System.Collections.Generic.Dictionary`2[[System.__Canon, mscorlib],[System.__Canon,
mscorlib]].FindEntry(System.__Canon)
2de9e5c4 716937f5 System.Collections.Generic.Dictionary`2[[System.__Canon, mscorlib],[System.__Canon,
mscorlib]].ContainsKey(System.__Canon)
2de9e5c8 2aabdade Apache.NMS.ActiveMQ.Transport.TransportFactory.FindTransportFactory(System.String)
2de9e614 2aabd983 Apache.NMS.ActiveMQ.Transport.TransportFactory.NewInstance(System.String)
2de9e680 2aabd865 Apache.NMS.ActiveMQ.Transport.TransportFactory.CreateTransportFactory(System.Uri)
2de9e6f0 2aabd73b Apache.NMS.ActiveMQ.Transport.TransportFactory.CreateTransport(System.Uri)
2de9e70c 2aabd4f1 Apache.NMS.ActiveMQ.ConnectionFactory.CreateActiveMQConnection(System.String,
System.String)
2de9e7a0 2aabd40a Apache.NMS.ActiveMQ.ConnectionFactory.CreateActiveMQConnection()
2de9e7b8 2aabd3a8 Apache.NMS.ActiveMQ.ConnectionFactory.CreateConnection()
{code}

I've searched for the solution and found a good article of Tess Ferrandez, explaining the
situation - http://blogs.msdn.com/b/tess/archive/2009/12/21/high-cpu-in-net-app-using-a-static-generic-dictionary.aspx

It seems that all access to static Dictionary classes should be synchronized. I've added lock
statements in the TransportFactory class to all appropriate places.

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