Hi All,
I really hope somebody can give me an hint on this matter, because it is driving me
crazy :-(
I have to implement a simple distributed cache between multiple JBoss istances not
necessarily clustered.
I though to use JGroups 2.2, which I understand JBoss uses already for clustering.
Therefore, I created a DistributedHashtable in the init() of my servlet as follows:
JChannel c = new JChannel(config.getInitParameter(PARAM_CHANNEL_PROPERTIES));
c.connect("thegroup");
cache = new DistributedHashtable(c, DEFAULT_TIMEOUT);
The channel is configured in this way:
"UDP(mcast_addr=228.1.2.3;mcast_port=45566;;ip_ttl=64;bind_addr=127.0.0.1;" +
"ip_mcast=true;mcast_send_buf_size=150000;mcast_recv_buf_size=80000):"
+
"PING(timeout=2000;num_initial_members=3):" +
"MERGE2(min_interval=5000;max_interval=10000):" +
"FD_SOCK:" +
"VERIFY_SUSPECT(timeout=1500):" +
"pbcast.NAKACK(gc_lag=50;retransmit_timeout=300,600,1200,2400,4800):" +
"UNICAST(timeout=5000):" +
"pbcast.STABLE(desired_avg_gossip=20000):" +
"FRAG(frag_size=4096;down_thread=false;up_thread=false):" +
"pbcast.GMS(join_timeout=5000;join_retry_timeout=2000;" +
"shun=false;print_local_addr=true):" +
"pbcast.STATE_TRANSFER";
Then when I run the servlet I put something in the hashtable. It alone works well.
Then I would like to test it with aother VM. I developed a simple program that
creates its own DistributedHastable on a chennel connected to the same group as the
other one (see the code at the bottom).
In short, I have the following strange situation:
1) both JVMs see each other (I display the channel views)
2) changes made with the second JVMs are propagated to the JBoss DistributedHahtable
3) changes made in the JBoss VM are NOT propagated to the second VM!!!!
I can't really understand why, as I though multicast communications have no a specific
direction....
Any help is very appreciated.
Stefano
-------------------------------------------------------------
2nd VM code:
=========
String
props="UDP(mcast_addr=228.1.2.3;mcast_port=45566;;ip_ttl=64;bind_addr=127.0.0.1;" +
"ip_mcast=true;mcast_send_buf_size=150000;mcast_recv_buf_size=80000):"
+
"PING(timeout=2000;num_initial_members=3):" +
"MERGE2(min_interval=5000;max_interval=10000):" +
"FD_SOCK:" +
"VERIFY_SUSPECT(timeout=1500):" +
"pbcast.NAKACK(gc_lag=50;retransmit_timeout=300,600,1200,2400,4800):" +
"UNICAST(timeout=5000):" +
"pbcast.STABLE(desired_avg_gossip=20000):" +
"FRAG(frag_size=4096;down_thread=false;up_thread=false):" +
"pbcast.GMS(join_timeout=5000;join_retry_timeout=2000;" +
"shun=false;print_local_addr=true):" +
"pbcast.STATE_TRANSFER";
JChannel c = new JChannel(props);
c.connect("thegroup");
DistributedHashtable h = new DistributedHashtable(c, -1);
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http://www.jboss.org/index.html?module=bb&op=viewtopic&p=3823386#3823386
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http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=3823386
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