Examples of Gossip

com.hellblazer.gossip.Gossip

The embodiment of the gossip protocol. This protocol replicates state and forms both a member discovery and failure detection service. Periodically, the protocol chooses a random member from the system view and initiates a round of gossip with it. A round of gossip is push/pull and involves 3 messages. For example, if node A wants to initiate a round of gossip with node B it starts off by sending node B a gossip message containing a digest of the view number state of the local view of the replicated state. Node B on receipt of this message sends node A a reply containing a list of digests representing the updated state required, based on the received digests. In addition, the node also sends along a list of updated state that is more recent, based on the initial list of digests. On receipt of this message node A sends node B the requested state that completes a round of gossip. When messages are received, the protocol updates the endpoint's failure detector with the liveness information. If the endpoint's failure detector predicts that the endpoint has failed, the endpoint is marked dead and its replicated state is abandoned. To ensure liveness, a special heartbeat state is maintained. This special state is not part of the notification regime and is updated periodically by this host. @author Hal Hildebrand

    @Test
    public void testFullConfiguration() throws Exception {
        InputStream is = getClass().getResourceAsStream("/yaml/fullConfig.yml");
        GossipConfiguration config = YamlHelper.fromYaml(is);
        assertNotNull(config);
        Gossip gossip = config.construct();
        assertNotNull(gossip);
    }

    @Test
    public void testMinimalConfiguration() throws Exception {
        InputStream is = getClass().getResourceAsStream("/yaml/minimalConfig.yml");
        GossipConfiguration config = YamlHelper.fromYaml(is);
        assertNotNull(config);
        Gossip gossip = config.construct();
        assertNotNull(gossip);
    }

        Random entropy = new Random();
        UdpCommunications comms = constructUdpComms();
        SystemView view = new SystemView(entropy, comms.getLocalAddress(),
                                         seeds, quarantineDelay,
                                         unreachableDelay);
        return new Gossip(Generators.timeBasedGenerator(), comms, view,
                          getFdFactory(), entropy, gossipInterval, gossipUnit,
                          cleanupCycles, heartbeatCycle, redundancy);
    }

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Examples of Gossip

Examples of com.hellblazer.gossip.Gossip

Examples of com.hellblazer.gossip.Gossip

Examples of com.hellblazer.gossip.Gossip