[jboss-user] [Remoting] - Re: MulticastDetector crashes my network

ron.sigal@jboss.com do-not-reply at jboss.com
Tue Aug 5 00:25:18 EDT 2008

Hi Santiago,

I think I see what is happening.  As I commented in JBREM-991,

anonymous wrote : 
  | It seems that the problem is a combination of
  |  1) the fact that listen() calls heartbeat() upon receiving something other than a Detection, and
  |  2) the fact that when heartbeat() creates a null Detection (due to the fact that there are no servers running in the JVM), it sends an empty packet.
  | So heartbeat() sends a null Detection, listen() receives it and calls heartbeat(), which sends out a Detection, etc. The problem is that, even though the timing of heartbeat() running in the Heartbeat TimerTask is regulated, listen() is not - it responds immediately upon reading something from the multicast socket, and the response can include a call to heartbeat.
  | MulticastDetector.heartbeat() has been changed so that if it creates a null Detection, it just returns instead of sending it. 

If you want to test my fix, it's just the insertion of two lines in org.jboss.remoting.detection.multicast.MulticastDetector.heartbeat()

  |       if(socket != null)
  |       {
  |          Detection msg = createDetection();
  |          if (msg == null)  // <== inserted
  |             return;        // <== inserted
  |          ...


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