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From "Timothy Bish (JIRA)" <jira+amq...@apache.org>
Subject [jira] Commented: (AMQNET-241) NMS Failover causes CPU utilization to spike if ActiveMQ is stopped.
Date Mon, 08 Mar 2010 21:57:44 GMT

    [ https://issues.apache.org/activemq/browse/AMQNET-241?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=58100#action_58100
] 

Timothy Bish commented on AMQNET-241:
-------------------------------------

In that case either you should see a send call fail by throwing an Exception or your ExceptionListener
callback should be triggered, what do you do in this case? 

Once the MaxReconnectionAttempts value is triggered the transport is no longer usable and
the Connection then is also unusable so it should be closed down as well.


> NMS Failover causes CPU utilization to spike if ActiveMQ is stopped.
> --------------------------------------------------------------------
>
>                 Key: AMQNET-241
>                 URL: https://issues.apache.org/activemq/browse/AMQNET-241
>             Project: ActiveMQ .Net
>          Issue Type: Bug
>          Components: ActiveMQ
>    Affects Versions: 1.2.0
>         Environment: .NET 3.5
>            Reporter: Ted Carroll
>            Assignee: Timothy Bish
>             Fix For: 1.2.1, 1.3.0
>
>         Attachments: NMS_Failover_CPU_Spike1.patch
>
>
> 1)  Configure a simple program that attempts to connect to ActiveMQ with the url "activemq:failover:(tcp://localhost:61616)"
> 2)  Make sure activemq is not running on the local host
> 3)  Try to connect.
> 4)  Notice that the CPU utilization in the sample program is high.
> 5)  Start ActiveMQ.
> 6)  Notice that the connection is successful but the CPU utilization remains high.
> Expected:
> I expect, potentially, an initial spike in CPU utilization but not sustained high CPU.
> Diagnosis:
> In FailoverTransport.DoConnect() there is the following if statement:
>                 if(ConnectedTransport != null || disposed || connectionFailure != null)

>                 { 
>                     return false; 
>                 } 
>                 else 
> it apears that connectionFailure is set and never reset.  Then the FailoverTask.Iterate()
calls into DoConnect only to return false immediately every time.
> I have attached a patch, but I would be uncomfortable calling it a long term solution
as I've not had the time to fully understand the code in question.  However, it seems to improve
the behavior.

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