System.RAP reported Warning for property IStatelessServiceInstance.OpenDuration error with azure service fabric project

Question

I am working on an Azure Service Fabric project which reads a message from ActiveMQ using Apache.NMS .NET library and creating durable consumer to read message from specific from ActiveMQ.

I am able to read the message and everything is working fine, but I am getting some warning as following.

'System.RAP' reported Warning for property 'IStatelessServiceInstance.OpenDuration'. The api IStatelessServiceInstance.Open on node _Node_0 is stuck.

This warning results in erroring the service, so I need to remove that warning.

Anybody why it's giving me the warning.

Here is a snapshot of how I am reading the message.

try
{
    ITopic dest = AMQSession.GetTopic(TopicName);

    using (IMessageConsumer consumer = AMQSession.CreateDurableConsumer(dest, SubscriptionName, MessageSelector, false))
    {
        IMessage message;
        while ((message = consumer.Receive()) != null)
        {
            ITextMessage txtMsg = message as ITextMessage;            
        }
    }
}
catch (Exception ex)
{
    Close();
}
finally
{
    Close();
}

Answer 1

This problem is almost certainly caused by the fact that your code here can block forever. Specifically, consumer.Receive() will block forever if no message arrives. As the documentation states:

Waits until a message is available and returns it

Also, even if a message does arrive the while loop ensures that the containing method will never return.

I recommend you specify a timeout when attempting to consume messages. If the timeout elapses then Receive will return null and the loop will be broken and the code will no longer be blocked.