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From "Ted Carroll (JIRA)" <>
Subject [jira] Updated: (AMQNET-241) NMS Failover causes CPU utilization to spike if ActiveMQ is stopped.
Date Tue, 09 Mar 2010 21:31:44 GMT


Ted Carroll updated AMQNET-241:


Added a program that reproduces the issue.

To answer the previous question, what I'd like to be able to do is return the error to the
user and, when the next request comes in, be able to still use the connection.  If ActiveMQ
comes back up in the meantime, I would like the connection to work.

Right now we have two choices.  1) wrap all calls with try catch blocks and tear down associated
producers, consumers, sessions, session pools, and the connection or 2) Remove the max retry
limit and appear to be "hung".


Ted C.

> NMS Failover causes CPU utilization to spike if ActiveMQ is stopped.
> --------------------------------------------------------------------
>                 Key: AMQNET-241
>                 URL:
>             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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