We rolled out a jgroups based cache propogation solution in production. This solution was working in our qa environment. But unfortunately the solution is not working in production. I am using the following configuration string

UDP(ucast_send_buf_size=800000;ucast_recv_buf_size=150000):
PING(timeout=2000;num_initial_members=3;up_thread=true;down_thread=true;):
MERGE2(min_interval=1000000;max_interval=2000000):
FD(shun=true;up_thread=true;down_thread=true;timeout=54000000;max_tries=5):
pbcast.NAKACK(gc_lag=50;retransmit_timeout=300,600,1200,2400,4800;max_xmit_size=8192;up_thread=true;down_thread=true):
pbcast.STABLE(desired_avg_gossip=2000000;up_thread=true;down_thread=true):
UNICAST:FRAG(frag_size=8192;down_thread=true;up_thread=true):
pbcast.GMS:VIEW_ENFORCER:QUEUE


I turned on debug for jgroups I can see the following messages in the log file.


xx.xx.105.65 ,xx.xx.105.67,xx.xx.105.69 and xx.xx.105.71
are the machines


[org.jgroups.protocols.pbcast.STABLE] received digest xx.xx.105.65:33163#5 (5), xx.xx.105.67:33020#0 (0), xx.xx.105.69:33018#2 (2), xx.xx.105.71:32975#3 (3) from xx.xx.105.69:33018

2006-02-01 14:00:34,868 DEBUG [org.jgroups.protocols.UDP] received (mcast) 51 bytes from /xx.xx.105.65:33166 (size=51 bytes)
2006-02-01 14:00:34,868 DEBUG [org.jgroups.protocols.UDP] message is [dst: 228.8.8.8:7600, src: xx.xx.105.65:33165 (2 headers), size = 0 bytes], headers are {UDP=[UDP:channel_name=dictionary], PING=[PING: type=GET_MBRS_REQ, arg=null]}
2006-02-01 14:00:34,868 WARN [org.jgroups.protocols.UDP] discarded message from different group (dictionary). Sender was xx.xx.105.65:33165
2006-02-01 14:00:34,868 DEBUG [org.jgroups.protocols.UDP] received (mcast) 51 bytes from /xx.xx.105.65:33166 (size=51 bytes)
2006-02-01 14:00:34,868 DEBUG [org.jgroups.protocols.UDP] message is [dst: 228.8.8.8:7600, src: xx.xx.105.65:33165 (2 headers), size = 0 bytes], headers are {UDP=[UDP:channel_name=dictionary], PING=[PING: type=GET_MBRS_REQ, arg=null]}
2006-02-01 14:00:34,869 WARN [org.jgroups.protocols.UDP] discarded message from different group (dictionary). Sender was xx.xx.105.65:33165
2006-02-01 14:00:34,869 DEBUG [org.jgroups.protocols.PING] received GET_MBRS_REQ from xx.xx.105.65:33165, sending response [PING: type=GET_MBRS_RSP, arg=[own_addr=xx.xx.105.67:33023, coord_addr=xx.xx.105.65:33165, is_server=true]]
2006-02-01 14:00:34,869 DEBUG [org.jgroups.protocols.UDP] sending msg to xx.xx.105.65:33165 (src=xx.xx.105.67:33023), headers are {PING=[PING: type=GET_MBRS_RSP, arg=[own_addr=xx.xx.105.67:33023, coord_addr=xx.xx.105.65:33165, is_server=true]], UDP=[UDP:channel_name=dictionary]}

My understanding is The above log message means that multicasting is enabled.

But when I publish text from one of the node; The other nodes does'nt revceive the publish text. I will appreciate your help in this.