Messages are not sent to all members when using UDP with ip_mcast disabled
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Key: JGRP-29
URL: http://jira.jboss.com/jira/browse/JGRP-29
Project: JGroups
Type: Bug
Versions: 2.2.8
Environment: Sun JDK 1.4.2_05
Reporter: B.S.Navin
Assigned to: Bela Ban
Priority: Critical
Attached the configuration file and the sample program.
The stack is a TCPPING/UDP combination. UDP has ip_mcast diabled. So all
messages will be unicast using UDP messages to each of the members.
2 members are started on ports 7800 and 7801 (7800 becomes the co-ordinator).
When I send a message from 7801, the message does not go to 7800 at all.
On checking the sources, I found that on sending, the UDP.sendUdpMessage() gets
called from UDP.sendMultipleUdpMessages(). This method is called using the same
Message object for each member of the group.
In this case, sendMultipleUdpMessages sets the destination of the Message
object to 7800 and calls sendUdpMessage. Here, the message is added to the
outgoing packet handler queue.
Then sendMultipleUdpMessages sets the destination of the Message object to 7801
and calls sendUdpMessage. But the Message object is the same. So actually the
destination of the Message object in the queue gets changed to 7801 and the
message is never delivered to 7800.
A copy of the message should be added to the outgoing queue.
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