Examples with LeaderElectionService org.apache.pulsar.broker.loadbalance.LeaderElectionService used on opensource projects

Example 1 with LeaderElectionService

use of org.apache.pulsar.broker.loadbalance.LeaderElectionService in project incubator-pulsar by apache.

the class PulsarService method start.

/**
 * Start the pulsar service instance.
 */
public void start() throws PulsarServerException {
    mutex.lock();
    try {
        if (state != State.Init) {
            throw new PulsarServerException("Cannot start the service once it was stopped");
        }
        // Now we are ready to start services
        localZooKeeperConnectionProvider = new LocalZooKeeperConnectionService(getZooKeeperClientFactory(), config.getZookeeperServers(), config.getZooKeeperSessionTimeoutMillis());
        localZooKeeperConnectionProvider.start(shutdownService);
        // Initialize and start service to access configuration repository.
        this.startZkCacheService();
        this.bkClientFactory = getBookKeeperClientFactory();
        managedLedgerClientFactory = new ManagedLedgerClientFactory(config, getZkClient(), bkClientFactory);
        this.brokerService = new BrokerService(this);
        // Start load management service (even if load balancing is disabled)
        this.loadManager.set(LoadManager.create(this));
        this.startLoadManagementService();
        // needs load management service
        this.startNamespaceService();
        LOG.info("Starting Pulsar Broker service; version: '{}'", (brokerVersion != null ? brokerVersion : "unknown"));
        brokerService.start();
        this.webService = new WebService(this);
        Map<String, Object> attributeMap = Maps.newHashMap();
        attributeMap.put(WebService.ATTRIBUTE_PULSAR_NAME, this);
        Map<String, Object> vipAttributeMap = Maps.newHashMap();
        vipAttributeMap.put(VipStatus.ATTRIBUTE_STATUS_FILE_PATH, this.config.getStatusFilePath());
        this.webService.addRestResources("/", VipStatus.class.getPackage().getName(), false, vipAttributeMap);
        this.webService.addRestResources("/", "org.apache.pulsar.broker.web", false, attributeMap);
        this.webService.addRestResources("/admin", "org.apache.pulsar.broker.admin.v1", true, attributeMap);
        this.webService.addRestResources("/admin/v2", "org.apache.pulsar.broker.admin.v2", true, attributeMap);
        this.webService.addRestResources("/lookup", "org.apache.pulsar.broker.lookup", true, attributeMap);
        this.webService.addServlet("/metrics", new ServletHolder(new PrometheusMetricsServlet(this, config.exposeTopicLevelMetricsInPrometheus())), false, attributeMap);
        if (config.isWebSocketServiceEnabled()) {
            // Use local broker address to avoid different IP address when using a VIP for service discovery
            this.webSocketService = new WebSocketService(new ClusterData(webServiceAddress, webServiceAddressTls, brokerServiceUrl, brokerServiceUrlTls), config);
            this.webSocketService.start();
            final WebSocketServlet producerWebSocketServlet = new WebSocketProducerServlet(webSocketService);
            this.webService.addServlet(WebSocketProducerServlet.SERVLET_PATH, new ServletHolder(producerWebSocketServlet), true, attributeMap);
            this.webService.addServlet(WebSocketProducerServlet.SERVLET_PATH_V2, new ServletHolder(producerWebSocketServlet), true, attributeMap);
            final WebSocketServlet consumerWebSocketServlet = new WebSocketConsumerServlet(webSocketService);
            this.webService.addServlet(WebSocketConsumerServlet.SERVLET_PATH, new ServletHolder(consumerWebSocketServlet), true, attributeMap);
            this.webService.addServlet(WebSocketConsumerServlet.SERVLET_PATH_V2, new ServletHolder(consumerWebSocketServlet), true, attributeMap);
            final WebSocketServlet readerWebSocketServlet = new WebSocketReaderServlet(webSocketService);
            this.webService.addServlet(WebSocketReaderServlet.SERVLET_PATH, new ServletHolder(readerWebSocketServlet), true, attributeMap);
            this.webService.addServlet(WebSocketReaderServlet.SERVLET_PATH_V2, new ServletHolder(readerWebSocketServlet), true, attributeMap);
        }
        if (LOG.isDebugEnabled()) {
            LOG.debug("Attempting to add static directory");
        }
        this.webService.addStaticResources("/static", "/static");
        // Register heartbeat and bootstrap namespaces.
        this.nsservice.registerBootstrapNamespaces();
        // Start the leader election service
        this.leaderElectionService = new LeaderElectionService(this, new LeaderListener() {

            @Override
            public synchronized void brokerIsTheLeaderNow() {
                if (getConfiguration().isLoadBalancerEnabled()) {
                    long loadSheddingInterval = TimeUnit.MINUTES.toMillis(getConfiguration().getLoadBalancerSheddingIntervalMinutes());
                    long resourceQuotaUpdateInterval = TimeUnit.MINUTES.toMillis(getConfiguration().getLoadBalancerResourceQuotaUpdateIntervalMinutes());
                    loadSheddingTask = loadManagerExecutor.scheduleAtFixedRate(new LoadSheddingTask(loadManager), loadSheddingInterval, loadSheddingInterval, TimeUnit.MILLISECONDS);
                    loadResourceQuotaTask = loadManagerExecutor.scheduleAtFixedRate(new LoadResourceQuotaUpdaterTask(loadManager), resourceQuotaUpdateInterval, resourceQuotaUpdateInterval, TimeUnit.MILLISECONDS);
                }
            }

            @Override
            public synchronized void brokerIsAFollowerNow() {
                if (loadSheddingTask != null) {
                    loadSheddingTask.cancel(false);
                    loadSheddingTask = null;
                }
                if (loadResourceQuotaTask != null) {
                    loadResourceQuotaTask.cancel(false);
                    loadResourceQuotaTask = null;
                }
            }
        });
        leaderElectionService.start();
        webService.start();
        this.metricsGenerator = new MetricsGenerator(this);
        schemaRegistryService = SchemaRegistryService.create(this);
        state = State.Started;
        acquireSLANamespace();
        LOG.info("messaging service is ready, bootstrap service on port={}, broker url={}, cluster={}, configs={}", config.getWebServicePort(), brokerServiceUrl, config.getClusterName(), ReflectionToStringBuilder.toString(config));
    } catch (Exception e) {
        LOG.error(e.getMessage(), e);
        throw new PulsarServerException(e);
    } finally {
        mutex.unlock();
    }
}