[javagroups-users] Problems with concurrent processing in MessageDispatcher

[Hanno W. <hwi...@vo...>]

Hello,

I have a problem with the MessageDispatcher in JGroups 2.2.8 and 2.2.9 =
when sending synchronous messages. If there are two (or more) nodes =
connected to the channel and the send synchronous messages using the =
MessageDispatcher cast method that cross each other the messages get =
stuck, e.g. there are nodes A and B and the communication happens in the =
following way:

Step    Node A                   Node B
  1  send request -----------> receive request
                                     |
  2  receive request <-------- send request
           |
  3  return result ----------> receive result
                                     |
  4  receive result <--------- send result
 =20
Then the communication stops in step 3 when sending back the result and =
B never retrieves this (or it is never really send at A). After the =
timeout specified in the cast method both clients continue without =
having any result. This also happens when I set concurrent processing to =
true in the MessageDispatcher. I have attached a sample program to =
reproduce the problem (after adjusting the ip address in TestLockupBase =
first start TestLockupSender and then TestLockupReceiver and wait for =
the first program to return before the 30 sec. timeout).

Thanks for you help,
Hanno Wiegard