聊聊storm nimbus的LeaderElector

    public static void main(String[] args) throws Exception {
        Utils.setupDefaultUncaughtExceptionHandler();
        launch(new StandaloneINimbus());
    }

    public static Nimbus launch(INimbus inimbus) throws Exception {
        Map<String, Object> conf = Utils.merge(ConfigUtils.readStormConfig(),
                                               ConfigUtils.readYamlConfig("storm-cluster-auth.yaml", false));
        boolean fixupAcl = (boolean) conf.get(DaemonConfig.STORM_NIMBUS_ZOOKEEPER_ACLS_FIXUP);
        boolean checkAcl = fixupAcl || (boolean) conf.get(DaemonConfig.STORM_NIMBUS_ZOOKEEPER_ACLS_CHECK);
        if (checkAcl) {
            AclEnforcement.verifyAcls(conf, fixupAcl);
        }
        return launchServer(conf, inimbus);
    }

    private static Nimbus launchServer(Map<String, Object> conf, INimbus inimbus) throws Exception {
        StormCommon.validateDistributedMode(conf);
        validatePortAvailable(conf);
        StormMetricsRegistry metricsRegistry = new StormMetricsRegistry();
        final Nimbus nimbus = new Nimbus(conf, inimbus, metricsRegistry);
        nimbus.launchServer();
        final ThriftServer server = new ThriftServer(conf, new Processor<>(nimbus), ThriftConnectionType.NIMBUS);
        metricsRegistry.startMetricsReporters(conf);
        Utils.addShutdownHookWithDelayedForceKill(() -> {
            metricsRegistry.stopMetricsReporters();
            nimbus.shutdown();
            server.stop();
        }, 10);
        if (ClientAuthUtils.areWorkerTokensEnabledServer(server, conf)) {
            nimbus.initWorkerTokenManager();
        }
        LOG.info("Starting nimbus server for storm version '{}'", STORM_VERSION);
        server.serve();
        return nimbus;
    }

    public Nimbus(Map<String, Object> conf, INimbus inimbus, IStormClusterState stormClusterState, NimbusInfo hostPortInfo,
                  BlobStore blobStore, TopoCache topoCache, ILeaderElector leaderElector, IGroupMappingServiceProvider groupMapper,
                  StormMetricsRegistry metricsRegistry)
        throws Exception {
        //......

        if (blobStore == null) {
            blobStore = ServerUtils.getNimbusBlobStore(conf, this.nimbusHostPortInfo, null);
        }
        this.blobStore = blobStore;

        if (topoCache == null) {
            topoCache = new TopoCache(blobStore, conf);
        }
        if (leaderElector == null) {
            leaderElector = Zookeeper.zkLeaderElector(conf, zkClient, blobStore, topoCache, stormClusterState, getNimbusAcls(conf),
                metricsRegistry);
        }
        this.leaderElector = leaderElector;
        this.blobStore.setLeaderElector(this.leaderElector);

        //......
    }

    public void launchServer() throws Exception {
        try {
            BlobStore store = blobStore;
            IStormClusterState state = stormClusterState;
            NimbusInfo hpi = nimbusHostPortInfo;

            LOG.info("Starting Nimbus with conf {}", ConfigUtils.maskPasswords(conf));
            validator.prepare(conf);

            //add to nimbuses
            state.addNimbusHost(hpi.getHost(),
                                new NimbusSummary(hpi.getHost(), hpi.getPort(), Time.currentTimeSecs(), false, STORM_VERSION));
            leaderElector.addToLeaderLockQueue();
            this.blobStore.startSyncBlobs();

            for (ClusterMetricsConsumerExecutor exec: clusterConsumerExceutors) {
                exec.prepare();
            }

            if (isLeader()) {
                for (String topoId : state.activeStorms()) {
                    transition(topoId, TopologyActions.STARTUP, null);
                }
                clusterMetricSet.setActive(true);
            }

            //......
        } catch (Exception e) {
            if (Utils.exceptionCauseIsInstanceOf(InterruptedException.class, e)) {
                throw e;
            }

            if (Utils.exceptionCauseIsInstanceOf(InterruptedIOException.class, e)) {
                throw e;
            }
            LOG.error("Error on initialization of nimbus", e);
            Utils.exitProcess(13, "Error on initialization of nimbus");
        }
    }

    /**
     * Get master leader elector.
     *
     * @param conf         Config.
     * @param zkClient     ZkClient, the client must have a default Config.STORM_ZOOKEEPER_ROOT as root path.
     * @param blobStore    {@link BlobStore}
     * @param tc           {@link TopoCache}
     * @param clusterState {@link IStormClusterState}
     * @param acls         ACLs
     * @return Instance of {@link ILeaderElector}
     *
     * @throws UnknownHostException
     */
    public static ILeaderElector zkLeaderElector(Map<String, Object> conf, CuratorFramework zkClient, BlobStore blobStore,
                                                 final TopoCache tc, IStormClusterState clusterState, List<ACL> acls,
                                                 StormMetricsRegistry metricsRegistry) throws UnknownHostException {
        return _instance.zkLeaderElectorImpl(conf, zkClient, blobStore, tc, clusterState, acls, metricsRegistry);
    }

    protected ILeaderElector zkLeaderElectorImpl(Map<String, Object> conf, CuratorFramework zk, BlobStore blobStore,
                                                 final TopoCache tc, IStormClusterState clusterState, List<ACL> acls,
                                                 StormMetricsRegistry metricsRegistry) throws
        UnknownHostException {
        List<String> servers = (List<String>) conf.get(Config.STORM_ZOOKEEPER_SERVERS);
        String leaderLockPath = "/leader-lock";
        String id = NimbusInfo.fromConf(conf).toHostPortString();
        AtomicReference<LeaderLatch> leaderLatchAtomicReference = new AtomicReference<>(new LeaderLatch(zk, leaderLockPath, id));
        AtomicReference<LeaderLatchListener> leaderLatchListenerAtomicReference =
            new AtomicReference<>(leaderLatchListenerImpl(
                new LeaderListenerCallback(conf, zk, leaderLatchAtomicReference.get(), blobStore, tc, clusterState, acls, metricsRegistry)));
        return new LeaderElectorImp(conf, servers, zk, leaderLockPath, id, leaderLatchAtomicReference,
                                    leaderLatchListenerAtomicReference, blobStore, tc, clusterState, acls, metricsRegistry);
    }

    // Leader latch listener that will be invoked when we either gain or lose leadership
    public static LeaderLatchListener leaderLatchListenerImpl(final Map conf, final CuratorFramework zk, final BlobStore blobStore, final LeaderLatch leaderLatch) throws UnknownHostException {
        final String hostName = InetAddress.getLocalHost().getCanonicalHostName();
        return new LeaderLatchListener() {
            final String STORM_JAR_SUFFIX = "-stormjar.jar";
            final String STORM_CODE_SUFFIX = "-stormcode.ser";
            final String STORM_CONF_SUFFIX = "-stormconf.ser";

            @Override
            public void isLeader() {
                Set<String> activeTopologyIds = new TreeSet<>(Zookeeper.getChildren(zk, conf.get(Config.STORM_ZOOKEEPER_ROOT) + ClusterUtils.STORMS_SUBTREE, false));

                Set<String> activeTopologyBlobKeys = populateTopologyBlobKeys(activeTopologyIds);
                Set<String> activeTopologyCodeKeys = filterTopologyCodeKeys(activeTopologyBlobKeys);
                Set<String> allLocalBlobKeys = Sets.newHashSet(blobStore.listKeys());
                Set<String> allLocalTopologyBlobKeys = filterTopologyBlobKeys(allLocalBlobKeys);

                // this finds all active topologies blob keys from all local topology blob keys
                Sets.SetView<String> diffTopology = Sets.difference(activeTopologyBlobKeys, allLocalTopologyBlobKeys);
                LOG.info("active-topology-blobs [{}] local-topology-blobs [{}] diff-topology-blobs [{}]",
                        generateJoinedString(activeTopologyIds), generateJoinedString(allLocalTopologyBlobKeys),
                        generateJoinedString(diffTopology));

                if (diffTopology.isEmpty()) {
                    Set<String> activeTopologyDependencies = getTopologyDependencyKeys(activeTopologyCodeKeys);

                    // this finds all dependency blob keys from active topologies from all local blob keys
                    Sets.SetView<String> diffDependencies = Sets.difference(activeTopologyDependencies, allLocalBlobKeys);
                    LOG.info("active-topology-dependencies [{}] local-blobs [{}] diff-topology-dependencies [{}]",
                            generateJoinedString(activeTopologyDependencies), generateJoinedString(allLocalBlobKeys),
                            generateJoinedString(diffDependencies));

                    if (diffDependencies.isEmpty()) {
                        LOG.info("Accepting leadership, all active topologies and corresponding dependencies found locally.");
                    } else {
                        LOG.info("Code for all active topologies is available locally, but some dependencies are not found locally, giving up leadership.");
                        closeLatch();
                    }
                } else {
                    LOG.info("code for all active topologies not available locally, giving up leadership.");
                    closeLatch();
                }
            }

            @Override
            public void notLeader() {
                LOG.info("{} lost leadership.", hostName);
            }

            //......

            private void closeLatch() {
                try {
                    leaderLatch.close();
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
        };
    }

public class LeaderElectorImp implements ILeaderElector {
    private static Logger LOG = LoggerFactory.getLogger(LeaderElectorImp.class);
    private final Map<String, Object> conf;
    private final List<String> servers;
    private final CuratorFramework zk;
    private final String leaderlockPath;
    private final String id;
    private final AtomicReference<LeaderLatch> leaderLatch;
    private final AtomicReference<LeaderLatchListener> leaderLatchListener;
    private final BlobStore blobStore;
    private final TopoCache tc;
    private final IStormClusterState clusterState;
    private final List<ACL> acls;
    private final StormMetricsRegistry metricsRegistry;

    public LeaderElectorImp(Map<String, Object> conf, List<String> servers, CuratorFramework zk, String leaderlockPath, String id,
                            AtomicReference<LeaderLatch> leaderLatch, AtomicReference<LeaderLatchListener> leaderLatchListener,
                            BlobStore blobStore, final TopoCache tc, IStormClusterState clusterState, List<ACL> acls,
                            StormMetricsRegistry metricsRegistry) {
        this.conf = conf;
        this.servers = servers;
        this.zk = zk;
        this.leaderlockPath = leaderlockPath;
        this.id = id;
        this.leaderLatch = leaderLatch;
        this.leaderLatchListener = leaderLatchListener;
        this.blobStore = blobStore;
        this.tc = tc;
        this.clusterState = clusterState;
        this.acls = acls;
        this.metricsRegistry = metricsRegistry;
    }

    @Override
    public void prepare(Map<String, Object> conf) {
        // no-op for zookeeper implementation
    }

    @Override
    public void addToLeaderLockQueue() throws Exception {
        // if this latch is already closed, we need to create new instance.
        if (LeaderLatch.State.CLOSED.equals(leaderLatch.get().getState())) {
            leaderLatch.set(new LeaderLatch(zk, leaderlockPath));
            LeaderListenerCallback callback = new LeaderListenerCallback(conf, zk, leaderLatch.get(), blobStore, tc, clusterState, acls,
                metricsRegistry);
            leaderLatchListener.set(Zookeeper.leaderLatchListenerImpl(callback));
            LOG.info("LeaderLatch was in closed state. Resetted the leaderLatch and listeners.");
        }
        // Only if the latch is not already started we invoke start
        if (LeaderLatch.State.LATENT.equals(leaderLatch.get().getState())) {
            leaderLatch.get().addListener(leaderLatchListener.get());
            leaderLatch.get().start();
            LOG.info("Queued up for leader lock.");
        } else {
            LOG.info("Node already in queue for leader lock.");
        }
    }

    @Override
    // Only started latches can be closed.
    public void removeFromLeaderLockQueue() throws Exception {
        if (LeaderLatch.State.STARTED.equals(leaderLatch.get().getState())) {
            leaderLatch.get().close();
            LOG.info("Removed from leader lock queue.");
        } else {
            LOG.info("leader latch is not started so no removeFromLeaderLockQueue needed.");
        }
    }

    @Override
    public boolean isLeader() throws Exception {
        return leaderLatch.get().hasLeadership();
    }

    @Override
    public NimbusInfo getLeader() {
        try {
            return Zookeeper.toNimbusInfo(leaderLatch.get().getLeader());
        } catch (Exception e) {
            throw Utils.wrapInRuntime(e);
        }
    }

    @Override
    public List<NimbusInfo> getAllNimbuses() throws Exception {
        List<NimbusInfo> nimbusInfos = new ArrayList<>();
        Collection<Participant> participants = leaderLatch.get().getParticipants();
        for (Participant participant : participants) {
            nimbusInfos.add(Zookeeper.toNimbusInfo(participant));
        }
        return nimbusInfos;
    }

    @Override
    public void close() {
        //Do nothing now.
    }
}