error with org.jgroups.protocols.pbcast.NAKACK

[simvtran]

jboss4.2.2GA
jdk1.5.0_14

I was able to cluster two instance by using the all directory and everything works accordingly. However, I have been trying to search online for the following error message:

2008-02-21 09:43:28,600 ERROR [org.jgroups.protocols.pbcast.NAKACK] (requester=<server1ip>:38638, local_addr=<server2ip>:59284) message <server2ip>:59284::141323 not found in sent msgs.
Sent messages: [141220 - 141343] (124)

I found one URL with similar case but the answer was not completely clear. Can someone please let me know what the above message mean or why I am getting the ERROR message. The above message appeared only once out of 5 hours. If more information is need, please let me know. Thank you.

[belaban]

Ignore it. This was a spurious retransmission request for message #141323, which probably crossed the delivery of the message.

I assume your system continued to function correctly right ?

[simvtran]

Yes, no production impact. Do you know whether there will be a fix for it, maybe in JBoss5?

[belaban]

No, I don't think so. I think we do have a JIRA issue, but very low prio. We'd have to remove the retransmission task from the timer rather than just cancelling it, and with the current java.util.concurrent threaded timer, this is expensive, so we'd incure an ovehead.

[simvtran]

Thank you for your reply.