Examples with LeaderElector io.kubernetes.client.extended.leaderelection.LeaderElector used on opensource projects

Example 6 with LeaderElector

use of io.kubernetes.client.extended.leaderelection.LeaderElector in project java by kubernetes-client.

the class LeaderElectionExample method main.

public static void main(String[] args) throws Exception {
    ApiClient client = Config.defaultClient();
    Configuration.setDefaultApiClient(client);
    // New
    String appNamespace = "default";
    String appName = "leader-election-foobar";
    // Anything unique
    String lockHolderIdentityName = UUID.randomUUID().toString();
    EndpointsLock lock = new EndpointsLock(appNamespace, appName, lockHolderIdentityName);
    LeaderElectionConfig leaderElectionConfig = new LeaderElectionConfig(lock, Duration.ofMillis(10000), Duration.ofMillis(8000), Duration.ofMillis(2000));
    try (LeaderElector leaderElector = new LeaderElector(leaderElectionConfig)) {
        leaderElector.run(() -> {
            System.out.println("Do something when getting leadership.");
        }, () -> {
            System.out.println("Do something when losing leadership.");
        });
    }
}

Example 7 with LeaderElector

use of io.kubernetes.client.extended.leaderelection.LeaderElector in project java by kubernetes-client.

the class ControllerExample method main.

public static void main(String[] args) throws IOException {
    CoreV1Api coreV1Api = new CoreV1Api();
    ApiClient apiClient = coreV1Api.getApiClient();
    OkHttpClient httpClient = apiClient.getHttpClient().newBuilder().readTimeout(0, TimeUnit.SECONDS).build();
    apiClient.setHttpClient(httpClient);
    // instantiating an informer-factory, and there should be only one informer-factory
    // globally.
    SharedInformerFactory informerFactory = new SharedInformerFactory();
    // registering node-informer into the informer-factory.
    SharedIndexInformer<V1Node> nodeInformer = informerFactory.sharedIndexInformerFor((CallGeneratorParams params) -> {
        return coreV1Api.listNodeCall(null, null, null, null, null, null, params.resourceVersion, null, params.timeoutSeconds, params.watch, null);
    }, V1Node.class, V1NodeList.class);
    informerFactory.startAllRegisteredInformers();
    EventBroadcaster eventBroadcaster = new LegacyEventBroadcaster(coreV1Api);
    // nodeReconciler prints node information on events
    NodePrintingReconciler nodeReconciler = new NodePrintingReconciler(nodeInformer, eventBroadcaster.newRecorder(new V1EventSource().host("localhost").component("node-printer")));
    // Use builder library to construct a default controller.
    Controller controller = ControllerBuilder.defaultBuilder(informerFactory).watch((workQueue) -> ControllerBuilder.controllerWatchBuilder(V1Node.class, workQueue).withWorkQueueKeyFunc((V1Node node) -> new Request(node.getMetadata().getName())).withOnAddFilter((V1Node createdNode) -> createdNode.getMetadata().getName().startsWith(// optional, set onAdd filter
    "docker-")).withOnUpdateFilter((V1Node oldNode, V1Node newNode) -> newNode.getMetadata().getName().startsWith(// optional, set onUpdate filter
    "docker-")).withOnDeleteFilter((V1Node deletedNode, Boolean stateUnknown) -> deletedNode.getMetadata().getName().startsWith(// optional, set onDelete filter
    "docker-")).build()).withReconciler(// required, set the actual reconciler
    nodeReconciler).withName(// optional, set name for controller
    "node-printing-controller").withWorkerCount(// optional, set worker thread count
    4).withReadyFunc(// optional, only starts controller when the
    nodeInformer::hasSynced).build();
    // Use builder library to manage one or multiple controllers.
    ControllerManager controllerManager = ControllerBuilder.controllerManagerBuilder(informerFactory).addController(controller).build();
    LeaderElectingController leaderElectingController = new LeaderElectingController(new LeaderElector(new LeaderElectionConfig(new EndpointsLock("kube-system", "leader-election", "foo"), Duration.ofMillis(10000), Duration.ofMillis(8000), Duration.ofMillis(5000))), controllerManager);
    leaderElectingController.run();
}

Example 8 with LeaderElector

use of io.kubernetes.client.extended.leaderelection.LeaderElector in project druid by druid-io.

the class DefaultK8sLeaderElectorFactory method create.

@Override
public K8sLeaderElector create(String candidateId, String namespace, String lockResourceName) {
    Lock lock = createLock(candidateId, namespace, lockResourceName, realK8sClient);
    LeaderElectionConfig leaderElectionConfig = new LeaderElectionConfig(lock, Duration.ofMillis(discoveryConfig.getLeaseDuration().getMillis()), Duration.ofMillis(discoveryConfig.getRenewDeadline().getMillis()), Duration.ofMillis(discoveryConfig.getRetryPeriod().getMillis()));
    LeaderElector leaderElector = new LeaderElector(leaderElectionConfig);
    return new K8sLeaderElector() {

        @Override
        public String getCurrentLeader() {
            try {
                return lock.get().getHolderIdentity();
            } catch (ApiException ex) {
                throw new RE(ex, "Failed  to get current leader for [%s]", lockResourceName);
            }
        }

        @Override
        public void run(Runnable startLeadingHook, Runnable stopLeadingHook) {
            leaderElector.run(startLeadingHook, stopLeadingHook);
        }
    };
}