Examples with DiscoveryDruidNode org.apache.druid.discovery.DiscoveryDruidNode used on opensource projects

Example 16 with DiscoveryDruidNode

use of org.apache.druid.discovery.DiscoveryDruidNode in project druid by druid-io.

the class HttpRemoteTaskRunnerTest method testWorkerDisapperAndReappearBeforeItsCleanup.

@Test(timeout = 60_000L)
public void testWorkerDisapperAndReappearBeforeItsCleanup() throws Exception {
    TestDruidNodeDiscovery druidNodeDiscovery = new TestDruidNodeDiscovery();
    DruidNodeDiscoveryProvider druidNodeDiscoveryProvider = EasyMock.createMock(DruidNodeDiscoveryProvider.class);
    EasyMock.expect(druidNodeDiscoveryProvider.getForService(WorkerNodeService.DISCOVERY_SERVICE_KEY)).andReturn(druidNodeDiscovery);
    EasyMock.replay(druidNodeDiscoveryProvider);
    ConcurrentMap<String, CustomFunction> workerHolders = new ConcurrentHashMap<>();
    HttpRemoteTaskRunner taskRunner = new HttpRemoteTaskRunner(TestHelper.makeJsonMapper(), new HttpRemoteTaskRunnerConfig() {

        @Override
        public int getPendingTasksRunnerNumThreads() {
            return 3;
        }
    }, EasyMock.createNiceMock(HttpClient.class), DSuppliers.of(new AtomicReference<>(DefaultWorkerBehaviorConfig.defaultConfig())), new NoopProvisioningStrategy<>(), druidNodeDiscoveryProvider, EasyMock.createNiceMock(TaskStorage.class), EasyMock.createNiceMock(CuratorFramework.class), new IndexerZkConfig(new ZkPathsConfig(), null, null, null, null)) {

        @Override
        protected WorkerHolder createWorkerHolder(ObjectMapper smileMapper, HttpClient httpClient, HttpRemoteTaskRunnerConfig config, ScheduledExecutorService workersSyncExec, WorkerHolder.Listener listener, Worker worker, List<TaskAnnouncement> knownAnnouncements) {
            if (workerHolders.containsKey(worker.getHost())) {
                return workerHolders.get(worker.getHost()).apply(smileMapper, httpClient, config, workersSyncExec, listener, worker, knownAnnouncements);
            } else {
                throw new ISE("No WorkerHolder for [%s].", worker.getHost());
            }
        }
    };
    taskRunner.start();
    Task task1 = NoopTask.create("task-id-1", 0);
    Task task2 = NoopTask.create("task-id-2", 0);
    DiscoveryDruidNode druidNode = new DiscoveryDruidNode(new DruidNode("service", "host", false, 1234, null, true, false), NodeRole.MIDDLE_MANAGER, ImmutableMap.of(WorkerNodeService.DISCOVERY_SERVICE_KEY, new WorkerNodeService("ip1", 2, "0", WorkerConfig.DEFAULT_CATEGORY)));
    workerHolders.put("host:1234", (mapper, httpClient, config, exec, listener, worker, knownAnnouncements) -> createWorkerHolder(mapper, httpClient, config, exec, listener, worker, knownAnnouncements, ImmutableList.of(), ImmutableMap.of(task1, ImmutableList.of(TaskAnnouncement.create(task1, TaskStatus.running(task1.getId()), TaskLocation.unknown()), TaskAnnouncement.create(task1, TaskStatus.running(task1.getId()), TaskLocation.create("host", 1234, 1235)), TaskAnnouncement.create(task1, TaskStatus.success(task1.getId()), TaskLocation.create("host", 1234, 1235))), task2, ImmutableList.of(TaskAnnouncement.create(task2, TaskStatus.running(task2.getId()), TaskLocation.unknown()), TaskAnnouncement.create(task2, TaskStatus.running(task2.getId()), TaskLocation.create("host", 1234, 1235)))), new AtomicInteger(), ImmutableSet.of()));
    druidNodeDiscovery.getListeners().get(0).nodesAdded(ImmutableList.of(druidNode));
    Future<TaskStatus> future1 = taskRunner.run(task1);
    Future<TaskStatus> future2 = taskRunner.run(task2);
    while (taskRunner.getPendingTasks().size() > 0) {
        Thread.sleep(100);
    }
    druidNodeDiscovery.getListeners().get(0).nodesRemoved(ImmutableList.of(druidNode));
    workerHolders.put("host:1234", (mapper, httpClient, config, exec, listener, worker, knownAnnouncements) -> createWorkerHolder(mapper, httpClient, config, exec, listener, worker, knownAnnouncements, ImmutableList.of(TaskAnnouncement.create(task2, TaskStatus.running(task2.getId()), TaskLocation.create("host", 1234, 1235)), TaskAnnouncement.create(task2, TaskStatus.success(task2.getId()), TaskLocation.create("host", 1234, 1235))), ImmutableMap.of(), new AtomicInteger(), ImmutableSet.of()));
    druidNodeDiscovery.getListeners().get(0).nodesAdded(ImmutableList.of(druidNode));
    Assert.assertTrue(future1.get().isSuccess());
    Assert.assertTrue(future2.get().isSuccess());
}

Example 17 with DiscoveryDruidNode

use of org.apache.druid.discovery.DiscoveryDruidNode in project druid by druid-io.

the class HttpRemoteTaskRunnerTest method testWorkerDisapperAndReappearAfterItsCleanup.

@Test(timeout = 60_000L)
public void testWorkerDisapperAndReappearAfterItsCleanup() throws Exception {
    TestDruidNodeDiscovery druidNodeDiscovery = new TestDruidNodeDiscovery();
    DruidNodeDiscoveryProvider druidNodeDiscoveryProvider = EasyMock.createMock(DruidNodeDiscoveryProvider.class);
    EasyMock.expect(druidNodeDiscoveryProvider.getForService(WorkerNodeService.DISCOVERY_SERVICE_KEY)).andReturn(druidNodeDiscovery);
    EasyMock.replay(druidNodeDiscoveryProvider);
    ConcurrentMap<String, CustomFunction> workerHolders = new ConcurrentHashMap<>();
    HttpRemoteTaskRunner taskRunner = new HttpRemoteTaskRunner(TestHelper.makeJsonMapper(), new HttpRemoteTaskRunnerConfig() {

        @Override
        public Period getTaskCleanupTimeout() {
            return Period.millis(1);
        }
    }, EasyMock.createNiceMock(HttpClient.class), DSuppliers.of(new AtomicReference<>(DefaultWorkerBehaviorConfig.defaultConfig())), new NoopProvisioningStrategy<>(), druidNodeDiscoveryProvider, EasyMock.createNiceMock(TaskStorage.class), EasyMock.createNiceMock(CuratorFramework.class), new IndexerZkConfig(new ZkPathsConfig(), null, null, null, null)) {

        @Override
        protected WorkerHolder createWorkerHolder(ObjectMapper smileMapper, HttpClient httpClient, HttpRemoteTaskRunnerConfig config, ScheduledExecutorService workersSyncExec, WorkerHolder.Listener listener, Worker worker, List<TaskAnnouncement> knownAnnouncements) {
            if (workerHolders.containsKey(worker.getHost())) {
                return workerHolders.get(worker.getHost()).apply(smileMapper, httpClient, config, workersSyncExec, listener, worker, knownAnnouncements);
            } else {
                throw new ISE("No WorkerHolder for [%s].", worker.getHost());
            }
        }
    };
    taskRunner.start();
    Task task1 = NoopTask.create("task-id-1", 0);
    Task task2 = NoopTask.create("task-id-2", 0);
    DiscoveryDruidNode druidNode = new DiscoveryDruidNode(new DruidNode("service", "host", false, 1234, null, true, false), NodeRole.MIDDLE_MANAGER, ImmutableMap.of(WorkerNodeService.DISCOVERY_SERVICE_KEY, new WorkerNodeService("ip1", 2, "0", WorkerConfig.DEFAULT_CATEGORY)));
    workerHolders.put("host:1234", (mapper, httpClient, config, exec, listener, worker, knownAnnouncements) -> createWorkerHolder(mapper, httpClient, config, exec, listener, worker, knownAnnouncements, ImmutableList.of(), ImmutableMap.of(task1, ImmutableList.of(TaskAnnouncement.create(task1, TaskStatus.running(task1.getId()), TaskLocation.unknown()), TaskAnnouncement.create(task1, TaskStatus.running(task1.getId()), TaskLocation.create("host", 1234, 1235))), task2, ImmutableList.of(TaskAnnouncement.create(task2, TaskStatus.running(task2.getId()), TaskLocation.unknown()), TaskAnnouncement.create(task2, TaskStatus.running(task2.getId()), TaskLocation.create("host", 1234, 1235)))), new AtomicInteger(), ImmutableSet.of()));
    druidNodeDiscovery.getListeners().get(0).nodesAdded(ImmutableList.of(druidNode));
    Future<TaskStatus> future1 = taskRunner.run(task1);
    Future<TaskStatus> future2 = taskRunner.run(task2);
    while (taskRunner.getPendingTasks().size() > 0) {
        Thread.sleep(100);
    }
    druidNodeDiscovery.getListeners().get(0).nodesRemoved(ImmutableList.of(druidNode));
    Assert.assertTrue(future1.get().isFailure());
    Assert.assertTrue(future2.get().isFailure());
    Assert.assertNotNull(future1.get().getErrorMsg());
    Assert.assertNotNull(future2.get().getErrorMsg());
    Assert.assertTrue(future1.get().getErrorMsg().startsWith("The worker that this task was assigned disappeared and did not report cleanup within timeout"));
    Assert.assertTrue(future2.get().getErrorMsg().startsWith("The worker that this task was assigned disappeared and did not report cleanup within timeout"));
    AtomicInteger ticks = new AtomicInteger();
    Set<String> actualShutdowns = new ConcurrentHashSet<>();
    workerHolders.put("host:1234", (mapper, httpClient, config, exec, listener, worker, knownAnnouncements) -> createWorkerHolder(mapper, httpClient, config, exec, listener, worker, knownAnnouncements, ImmutableList.of(TaskAnnouncement.create(task1, TaskStatus.success(task1.getId()), TaskLocation.create("host", 1234, 1235)), TaskAnnouncement.create(task2, TaskStatus.running(task2.getId()), TaskLocation.create("host", 1234, 1235))), ImmutableMap.of(), ticks, actualShutdowns));
    druidNodeDiscovery.getListeners().get(0).nodesAdded(ImmutableList.of(druidNode));
    while (ticks.get() < 1) {
        Thread.sleep(100);
    }
    Assert.assertEquals(ImmutableSet.of(task2.getId()), actualShutdowns);
    Assert.assertTrue(taskRunner.run(task1).get().isFailure());
    Assert.assertTrue(taskRunner.run(task2).get().isFailure());
}

Example 18 with DiscoveryDruidNode

use of org.apache.druid.discovery.DiscoveryDruidNode in project druid by druid-io.

the class HttpRemoteTaskRunnerTest method testFreshStartAndStop.

/*
  Simulates startup of Overlord. Overlord is then stopped and is expected to close down certain things.
   */
@Test(timeout = 60_000L)
public void testFreshStartAndStop() {
    TestDruidNodeDiscovery druidNodeDiscovery = new TestDruidNodeDiscovery();
    DruidNodeDiscoveryProvider druidNodeDiscoveryProvider = EasyMock.createMock(DruidNodeDiscoveryProvider.class);
    EasyMock.expect(druidNodeDiscoveryProvider.getForService(WorkerNodeService.DISCOVERY_SERVICE_KEY)).andReturn(druidNodeDiscovery).times(2);
    ProvisioningStrategy provisioningStrategy = EasyMock.createMock(ProvisioningStrategy.class);
    ProvisioningService provisioningService = EasyMock.createNiceMock(ProvisioningService.class);
    EasyMock.expect(provisioningStrategy.makeProvisioningService(isA(HttpRemoteTaskRunner.class))).andReturn(provisioningService);
    provisioningService.close();
    EasyMock.expectLastCall();
    EasyMock.replay(druidNodeDiscoveryProvider, provisioningStrategy, provisioningService);
    DiscoveryDruidNode druidNode1 = new DiscoveryDruidNode(new DruidNode("service", "host1", false, 8080, null, true, false), NodeRole.MIDDLE_MANAGER, ImmutableMap.of(WorkerNodeService.DISCOVERY_SERVICE_KEY, new WorkerNodeService("ip1", 2, "0", WorkerConfig.DEFAULT_CATEGORY)));
    DiscoveryDruidNode druidNode2 = new DiscoveryDruidNode(new DruidNode("service", "host2", false, 8080, null, true, false), NodeRole.MIDDLE_MANAGER, ImmutableMap.of(WorkerNodeService.DISCOVERY_SERVICE_KEY, new WorkerNodeService("ip2", 2, "0", WorkerConfig.DEFAULT_CATEGORY)));
    HttpRemoteTaskRunner taskRunner = newHttpTaskRunnerInstance(druidNodeDiscoveryProvider, provisioningStrategy);
    taskRunner.start();
    druidNodeDiscovery.getListeners().get(0).nodesAdded(ImmutableList.of(druidNode1, druidNode2));
    ConcurrentMap<String, WorkerHolder> workers = taskRunner.getWorkersForTestingReadOnly();
    Assert.assertEquals(2, workers.size());
    Assert.assertTrue(workers.values().stream().noneMatch(w -> w.getUnderlyingSyncer().isExecutorShutdown()));
    workers.values().iterator().next().stop();
    taskRunner.stop();
    Assert.assertTrue(druidNodeDiscovery.getListeners().isEmpty());
    Assert.assertEquals(2, workers.size());
    Assert.assertTrue(workers.values().stream().allMatch(w -> w.getUnderlyingSyncer().isExecutorShutdown()));
    EasyMock.verify(druidNodeDiscoveryProvider, provisioningStrategy, provisioningService);
}

Example 19 with DiscoveryDruidNode

use of org.apache.druid.discovery.DiscoveryDruidNode in project druid by druid-io.

the class HttpRemoteTaskRunnerTest method testMarkWorkersLazy.

@Test(timeout = 60_000L)
public void testMarkWorkersLazy() throws Exception {
    TestDruidNodeDiscovery druidNodeDiscovery = new TestDruidNodeDiscovery();
    DruidNodeDiscoveryProvider druidNodeDiscoveryProvider = EasyMock.createMock(DruidNodeDiscoveryProvider.class);
    EasyMock.expect(druidNodeDiscoveryProvider.getForService(WorkerNodeService.DISCOVERY_SERVICE_KEY)).andReturn(druidNodeDiscovery);
    EasyMock.replay(druidNodeDiscoveryProvider);
    Task task1 = NoopTask.create("task-id-1", 0);
    Task task2 = NoopTask.create("task-id-2", 0);
    String additionalWorkerCategory = "category2";
    ConcurrentMap<String, CustomFunction> workerHolders = new ConcurrentHashMap<>();
    HttpRemoteTaskRunner taskRunner = new HttpRemoteTaskRunner(TestHelper.makeJsonMapper(), new HttpRemoteTaskRunnerConfig() {

        @Override
        public int getPendingTasksRunnerNumThreads() {
            return 3;
        }
    }, EasyMock.createNiceMock(HttpClient.class), DSuppliers.of(new AtomicReference<>(DefaultWorkerBehaviorConfig.defaultConfig())), new NoopProvisioningStrategy<>(), druidNodeDiscoveryProvider, EasyMock.createNiceMock(TaskStorage.class), EasyMock.createNiceMock(CuratorFramework.class), new IndexerZkConfig(new ZkPathsConfig(), null, null, null, null)) {

        @Override
        protected WorkerHolder createWorkerHolder(ObjectMapper smileMapper, HttpClient httpClient, HttpRemoteTaskRunnerConfig config, ScheduledExecutorService workersSyncExec, WorkerHolder.Listener listener, Worker worker, List<TaskAnnouncement> knownAnnouncements) {
            if (workerHolders.containsKey(worker.getHost())) {
                return workerHolders.get(worker.getHost()).apply(smileMapper, httpClient, config, workersSyncExec, listener, worker, knownAnnouncements);
            } else {
                throw new ISE("No WorkerHolder for [%s].", worker.getHost());
            }
        }
    };
    taskRunner.start();
    Assert.assertTrue(taskRunner.getTotalTaskSlotCount().isEmpty());
    Assert.assertTrue(taskRunner.getIdleTaskSlotCount().isEmpty());
    Assert.assertTrue(taskRunner.getUsedTaskSlotCount().isEmpty());
    AtomicInteger ticks = new AtomicInteger();
    DiscoveryDruidNode druidNode1 = new DiscoveryDruidNode(new DruidNode("service", "host1", false, 8080, null, true, false), NodeRole.MIDDLE_MANAGER, ImmutableMap.of(WorkerNodeService.DISCOVERY_SERVICE_KEY, new WorkerNodeService("ip1", 1, "0", WorkerConfig.DEFAULT_CATEGORY)));
    workerHolders.put("host1:8080", (mapper, httpClient, config, exec, listener, worker, knownAnnouncements) -> createWorkerHolder(mapper, httpClient, config, exec, listener, worker, knownAnnouncements, ImmutableList.of(), ImmutableMap.of(task1, ImmutableList.of(TaskAnnouncement.create(task1, TaskStatus.running(task1.getId()), TaskLocation.unknown()), TaskAnnouncement.create(task1, TaskStatus.running(task1.getId()), TaskLocation.create("host1", 8080, -1)))), ticks, ImmutableSet.of()));
    druidNodeDiscovery.getListeners().get(0).nodesAdded(ImmutableList.of(druidNode1));
    Assert.assertEquals(1, taskRunner.getTotalTaskSlotCount().get(WorkerConfig.DEFAULT_CATEGORY).longValue());
    Assert.assertEquals(1, taskRunner.getIdleTaskSlotCount().get(WorkerConfig.DEFAULT_CATEGORY).longValue());
    Assert.assertEquals(0, taskRunner.getUsedTaskSlotCount().get(WorkerConfig.DEFAULT_CATEGORY).longValue());
    taskRunner.run(task1);
    while (ticks.get() < 1) {
        Thread.sleep(100);
    }
    Assert.assertEquals(1, taskRunner.getTotalTaskSlotCount().get(WorkerConfig.DEFAULT_CATEGORY).longValue());
    Assert.assertEquals(0, taskRunner.getIdleTaskSlotCount().get(WorkerConfig.DEFAULT_CATEGORY).longValue());
    Assert.assertEquals(1, taskRunner.getUsedTaskSlotCount().get(WorkerConfig.DEFAULT_CATEGORY).longValue());
    DiscoveryDruidNode druidNode2 = new DiscoveryDruidNode(new DruidNode("service", "host2", false, 8080, null, true, false), NodeRole.MIDDLE_MANAGER, ImmutableMap.of(WorkerNodeService.DISCOVERY_SERVICE_KEY, new WorkerNodeService("ip2", 1, "0", additionalWorkerCategory)));
    workerHolders.put("host2:8080", (mapper, httpClient, config, exec, listener, worker, knownAnnouncements) -> createWorkerHolder(mapper, httpClient, config, exec, listener, worker, knownAnnouncements, ImmutableList.of(), ImmutableMap.of(task2, ImmutableList.of()), ticks, ImmutableSet.of()));
    druidNodeDiscovery.getListeners().get(0).nodesAdded(ImmutableList.of(druidNode2));
    Assert.assertEquals(1, taskRunner.getTotalTaskSlotCount().get(WorkerConfig.DEFAULT_CATEGORY).longValue());
    Assert.assertEquals(1, taskRunner.getTotalTaskSlotCount().get(additionalWorkerCategory).longValue());
    Assert.assertEquals(0, taskRunner.getIdleTaskSlotCount().get(WorkerConfig.DEFAULT_CATEGORY).longValue());
    Assert.assertEquals(1, taskRunner.getIdleTaskSlotCount().get(additionalWorkerCategory).longValue());
    Assert.assertEquals(1, taskRunner.getUsedTaskSlotCount().get(WorkerConfig.DEFAULT_CATEGORY).longValue());
    Assert.assertEquals(0, taskRunner.getUsedTaskSlotCount().get(additionalWorkerCategory).longValue());
    taskRunner.run(task2);
    while (ticks.get() < 2) {
        Thread.sleep(100);
    }
    Assert.assertEquals(1, taskRunner.getTotalTaskSlotCount().get(WorkerConfig.DEFAULT_CATEGORY).longValue());
    Assert.assertEquals(1, taskRunner.getTotalTaskSlotCount().get(additionalWorkerCategory).longValue());
    Assert.assertEquals(0, taskRunner.getIdleTaskSlotCount().get(WorkerConfig.DEFAULT_CATEGORY).longValue());
    Assert.assertFalse(taskRunner.getIdleTaskSlotCount().containsKey(additionalWorkerCategory));
    Assert.assertEquals(1, taskRunner.getUsedTaskSlotCount().get(WorkerConfig.DEFAULT_CATEGORY).longValue());
    Assert.assertEquals(0, taskRunner.getUsedTaskSlotCount().get(additionalWorkerCategory).longValue());
    DiscoveryDruidNode druidNode3 = new DiscoveryDruidNode(new DruidNode("service", "host3", false, 8080, null, true, false), NodeRole.MIDDLE_MANAGER, ImmutableMap.of(WorkerNodeService.DISCOVERY_SERVICE_KEY, new WorkerNodeService("ip2", 1, "0", WorkerConfig.DEFAULT_CATEGORY)));
    workerHolders.put("host3:8080", (mapper, httpClient, config, exec, listener, worker, knownAnnouncements) -> createWorkerHolder(mapper, httpClient, config, exec, listener, worker, knownAnnouncements, ImmutableList.of(), ImmutableMap.of(), new AtomicInteger(), ImmutableSet.of()));
    druidNodeDiscovery.getListeners().get(0).nodesAdded(ImmutableList.of(druidNode3));
    Assert.assertEquals(2, taskRunner.getTotalTaskSlotCount().get(WorkerConfig.DEFAULT_CATEGORY).longValue());
    Assert.assertEquals(1, taskRunner.getTotalTaskSlotCount().get(additionalWorkerCategory).longValue());
    Assert.assertEquals(1, taskRunner.getIdleTaskSlotCount().get(WorkerConfig.DEFAULT_CATEGORY).longValue());
    Assert.assertFalse(taskRunner.getIdleTaskSlotCount().containsKey(additionalWorkerCategory));
    Assert.assertEquals(1, taskRunner.getUsedTaskSlotCount().get(WorkerConfig.DEFAULT_CATEGORY).longValue());
    Assert.assertEquals(0, taskRunner.getUsedTaskSlotCount().get(additionalWorkerCategory).longValue());
    Assert.assertFalse(taskRunner.getLazyTaskSlotCount().containsKey(WorkerConfig.DEFAULT_CATEGORY));
    Assert.assertFalse(taskRunner.getLazyTaskSlotCount().containsKey(additionalWorkerCategory));
    Assert.assertEquals(task1.getId(), Iterables.getOnlyElement(taskRunner.getRunningTasks()).getTaskId());
    Assert.assertEquals(task2.getId(), Iterables.getOnlyElement(taskRunner.getPendingTasks()).getTaskId());
    Assert.assertEquals("host3:8080", Iterables.getOnlyElement(taskRunner.markWorkersLazy(Predicates.alwaysTrue(), Integer.MAX_VALUE)).getHost());
    Assert.assertEquals(2, taskRunner.getTotalTaskSlotCount().get(WorkerConfig.DEFAULT_CATEGORY).longValue());
    Assert.assertEquals(1, taskRunner.getTotalTaskSlotCount().get(additionalWorkerCategory).longValue());
    Assert.assertEquals(0, taskRunner.getIdleTaskSlotCount().get(WorkerConfig.DEFAULT_CATEGORY).longValue());
    Assert.assertFalse(taskRunner.getIdleTaskSlotCount().containsKey(additionalWorkerCategory));
    Assert.assertEquals(1, taskRunner.getUsedTaskSlotCount().get(WorkerConfig.DEFAULT_CATEGORY).longValue());
    Assert.assertEquals(0, taskRunner.getUsedTaskSlotCount().get(additionalWorkerCategory).longValue());
    Assert.assertEquals(1, taskRunner.getLazyTaskSlotCount().get(WorkerConfig.DEFAULT_CATEGORY).longValue());
    Assert.assertFalse(taskRunner.getLazyTaskSlotCount().containsKey(additionalWorkerCategory));
}

Example 20 with DiscoveryDruidNode

use of org.apache.druid.discovery.DiscoveryDruidNode in project druid by druid-io.

the class CommonCacheNotifier method sendUpdate.

private List<ListenableFuture<StatusResponseHolder>> sendUpdate(String updatedAuthenticatorPrefix, byte[] serializedEntity) {
    List<ListenableFuture<StatusResponseHolder>> futures = new ArrayList<>();
    for (NodeRole nodeRole : NODE_TYPES) {
        DruidNodeDiscovery nodeDiscovery = discoveryProvider.getForNodeRole(nodeRole);
        Collection<DiscoveryDruidNode> nodes = nodeDiscovery.getAllNodes();
        for (DiscoveryDruidNode node : nodes) {
            URL listenerURL = getListenerURL(node.getDruidNode(), StringUtils.format(baseUrl, StringUtils.urlEncode(updatedAuthenticatorPrefix)));
            // best effort, if this fails, remote node will poll and pick up the update eventually
            Request req = new Request(HttpMethod.POST, listenerURL);
            req.setContent(MediaType.APPLICATION_JSON, serializedEntity);
            BasicAuthDBConfig itemConfig = itemConfigMap.get(updatedAuthenticatorPrefix);
            ListenableFuture<StatusResponseHolder> future = httpClient.go(req, new ResponseHandler(), Duration.millis(itemConfig.getCacheNotificationTimeout()));
            futures.add(future);
        }
    }
    return futures;
}