Hello All

   We are using Jgroups 3.2.7. Here Node means an application with Jgroups in it. I have Node1, Node2 on physcial Machine 1 and Node3 and Nod4 on Physcial Machine 2.

when i start all the nodes together all works great, cluster is formed with Node1, Node2, Node3 and Node4 as its members.

Scenario 1: If I restart one of the nodes let us say Node1.

Node1 sees only Node1, Node2, 5fbbafbf-769a-b553-d89a-eed703019334, ec3af265-f06f-5cff-ce3a-5391a01a0b19

Node2 sees Node1, Node2, Node3 and Node4

Node3 sess only Node2, Node3 and Node4

Node4 sees only Node2, Node3 and Node4

Scenario 2: If I restart two of the nodes let us say Node1 and Node2

Node1 sees only Node1, Node2

Node2 sees Node1, Node2

Node3 sess only Node3 and Node4

Node4 sees only Node3 and Node4

My Jgroups protocol config looks like

    UDP(mcast_addr=239.56.30.2;mcast_port=7500;ip_ttl=32;mcast_send_buf_size=64000;mcast_recv_buf_size=64000;ucast_send_buf_size=64000;ucast_recv_buf_size=64000;loopback=true;enable_diagnostics=false;discard_incompatible_packets=true)

    PING(timeout=2000;num_initial_members=3)

    MERGE2(min_interval=5000;max_interval=10000)

    FD_SOCK

    FD(timeout=5000;max_tries=5;shun=true)

    VERIFY_SUSPECT(timeout=30000)

    pbcast.NAKACK(gc_lag=50;retransmit_timeout=600,1200,2400,4800;log_not_found_msgs=false)

    UNICAST(timeout=600,1200,2400,4800)

    pbcast.STABLE(desired_avg_gossip=20000)

    FRAG(frag_size=32768)

    pbcast.GMS(join_timeout=5000;shun=false;print_local_addr=false)FC(max_credits=200000;down_thread=false)

We are using UDP IP multicast to form our clusters.

Any thing odd in my protocol config, looks like rejoining is not happening as expected.