Examples of org.jgroups.protocols.FD_SOCK

org.jgroups.protocols.FD_SOCK

Failure detection protocol based on sockets. Failure detection is ring-based. Each member creates a server socket and announces its address together with the server socket's address in a multicast. A pinger thread will be started when the membership goes above 1 and will be stopped when it drops below 2. The pinger thread connects to its neighbor on the right and waits until the socket is closed. When the socket is closed by the monitored peer in an abnormal fashion (IOException), the neighbor will be suspected.

The main feature of this protocol is that no ping messages need to be exchanged between any 2 peers, and failure detection relies entirely on TCP sockets. The advantage is that no activity will take place between 2 peers as long as they are alive (i.e. have their server sockets open). The disadvantage is that hung servers or crashed routers will not cause sockets to be closed, therefore they won't be detected. The FD_SOCK protocol will work for groups where members are on different hosts

The costs involved are 2 additional threads: one that monitors the client side of the socket connection (to monitor a peer) and another one that manages the server socket. However, those threads will be idle as long as both peers are running. @author Bela Ban May 29 2001

    channel.setProtocolStack(stack);
    
    stack.addProtocols(new UDP().setValue("bind_addr", InetAddress.getByName(BIND_ADDR)))
        .addProtocol(new PING())
        .addProtocol(new MERGE2())
        .addProtocol(new FD_SOCK())
        .addProtocol(new FD_ALL().setValue("timeout", 12000).setValue("interval", 3000))
        .addProtocol(new VERIFY_SUSPECT()).addProtocol(new BARRIER())
        .addProtocol(new NAKACK()).addProtocol(new UNICAST2())
        .addProtocol(new STABLE()).addProtocol(new GMS())
        .addProtocol(new UFC()).addProtocol(new MFC())

    channel.setProtocolStack(stack);
    
    stack.addProtocols(new UDP().setValue("bind_addr", InetAddress.getByName("192.168.1.108")))
        .addProtocol(new PING())
        .addProtocol(new MERGE2())
        .addProtocol(new FD_SOCK())
        .addProtocol(new FD_ALL().setValue("timeout", 12000).setValue("interval", 3000))
        .addProtocol(new VERIFY_SUSPECT()).addProtocol(new BARRIER())
        .addProtocol(new NAKACK()).addProtocol(new UNICAST2())
        .addProtocol(new STABLE()).addProtocol(new GMS())
        .addProtocol(new UFC()).addProtocol(new MFC())

               return;
            }         
         }  
         discard.setDiscardAll(true);
         // The FD_SOCK requires special handling because it uses non-standard sockets to interconnect
         FD_SOCK fdSock = (FD_SOCK)channel.getProtocolStack().findProtocol(FD_SOCK.class);
         if (fdSock != null) {
            fdSock.stopServerSocket(false);
         }
      }
      log.debug("Started discarding packets");
   }

Examples of org.jgroups.protocols.FD_SOCK

Related Classes of org.jgroups.protocols.FD_SOCK