class TaskExecutor extends RpcEndpoint implements TaskExecutorGateway {

	@Override
	public CompletableFuture<Acknowledge> submitTask(
			TaskDeploymentDescriptor tdd,
			JobMasterId jobMasterId,
			Time timeout) {

		try {
			final JobID jobId = tdd.getJobId();
			final JobManagerConnection jobManagerConnection = jobManagerTable.get(jobId);

			if (jobManagerConnection == null) {
				final String message = "Could not submit task because there is no JobManager " +
					"associated for the job " + jobId + '.';

				log.debug(message);
				throw new TaskSubmissionException(message);
			}

			if (!Objects.equals(jobManagerConnection.getJobMasterId(), jobMasterId)) {
				final String message = "Rejecting the task submission because the job manager leader id " +
					jobMasterId + " does not match the expected job manager leader id " +
					jobManagerConnection.getJobMasterId() + '.';

				log.debug(message);
				throw new TaskSubmissionException(message);
			}

			if (!taskSlotTable.tryMarkSlotActive(jobId, tdd.getAllocationId())) {
				final String message = "No task slot allocated for job ID " + jobId +
					" and allocation ID " + tdd.getAllocationId() + '.';
				log.debug(message);
				throw new TaskSubmissionException(message);
			}

			// re-integrate offloaded data:
			try {
				tdd.loadBigData(blobCacheService.getPermanentBlobService());
			} catch (IOException | ClassNotFoundException e) {
				throw new TaskSubmissionException("Could not re-integrate offloaded TaskDeploymentDescriptor data.", e);
			}

			// deserialize the pre-serialized information
			final JobInformation jobInformation;
			final TaskInformation taskInformation;
			try {
				jobInformation = tdd.getSerializedJobInformation().deserializeValue(getClass().getClassLoader());
				taskInformation = tdd.getSerializedTaskInformation().deserializeValue(getClass().getClassLoader());
			} catch (IOException | ClassNotFoundException e) {
				throw new TaskSubmissionException("Could not deserialize the job or task information.", e);
			}

			if (!jobId.equals(jobInformation.getJobId())) {
				throw new TaskSubmissionException(
					"Inconsistent job ID information inside TaskDeploymentDescriptor (" +
						tdd.getJobId() + " vs. " + jobInformation.getJobId() + ")");
			}

			TaskMetricGroup taskMetricGroup = taskManagerMetricGroup.addTaskForJob(
				jobInformation.getJobId(),
				jobInformation.getJobName(),
				taskInformation.getJobVertexId(),
				tdd.getExecutionAttemptId(),
				taskInformation.getTaskName(),
				tdd.getSubtaskIndex(),
				tdd.getAttemptNumber());

			InputSplitProvider inputSplitProvider = new RpcInputSplitProvider(
				jobManagerConnection.getJobManagerGateway(),
				taskInformation.getJobVertexId(),
				tdd.getExecutionAttemptId(),
				taskManagerConfiguration.getTimeout());

			TaskManagerActions taskManagerActions = jobManagerConnection.getTaskManagerActions();
			CheckpointResponder checkpointResponder = jobManagerConnection.getCheckpointResponder();
			GlobalAggregateManager aggregateManager = jobManagerConnection.getGlobalAggregateManager();

			LibraryCacheManager libraryCache = jobManagerConnection.getLibraryCacheManager();
			ResultPartitionConsumableNotifier resultPartitionConsumableNotifier = jobManagerConnection.getResultPartitionConsumableNotifier();
			PartitionProducerStateChecker partitionStateChecker = jobManagerConnection.getPartitionStateChecker();

			final TaskLocalStateStore localStateStore = localStateStoresManager.localStateStoreForSubtask(
				jobId,
				tdd.getAllocationId(),
				taskInformation.getJobVertexId(),
				tdd.getSubtaskIndex());

			final JobManagerTaskRestore taskRestore = tdd.getTaskRestore();

			final TaskStateManager taskStateManager = new TaskStateManagerImpl(
				jobId,
				tdd.getExecutionAttemptId(),
				localStateStore,
				taskRestore,
				checkpointResponder);

			Task task = new Task(
				jobInformation,
				taskInformation,
				tdd.getExecutionAttemptId(),
				tdd.getAllocationId(),
				tdd.getSubtaskIndex(),
				tdd.getAttemptNumber(),
				tdd.getProducedPartitions(),
				tdd.getInputGates(),
				tdd.getTargetSlotNumber(),
				taskExecutorServices.getMemoryManager(),
				taskExecutorServices.getIOManager(),
				taskExecutorServices.getShuffleEnvironment(),
				taskExecutorServices.getKvStateService(),
				taskExecutorServices.getBroadcastVariableManager(),
				taskExecutorServices.getTaskEventDispatcher(),
				taskStateManager,
				taskManagerActions,
				inputSplitProvider,
				checkpointResponder,
				aggregateManager,
				blobCacheService,
				libraryCache,
				fileCache,
				taskManagerConfiguration,
				taskMetricGroup,
				resultPartitionConsumableNotifier,
				partitionStateChecker,
				getRpcService().getExecutor());

			log.info("Received task {}.", task.getTaskInfo().getTaskNameWithSubtasks());

			boolean taskAdded;

			try {
				taskAdded = taskSlotTable.addTask(task);
			} catch (SlotNotFoundException | SlotNotActiveException e) {
				throw new TaskSubmissionException("Could not submit task.", e);
			}

			if (taskAdded) {
				task.startTaskThread();

				setupResultPartitionBookkeeping(tdd, task.getTerminationFuture());
				return CompletableFuture.completedFuture(Acknowledge.get());
			} else {
				final String message = "TaskManager already contains a task for id " +
					task.getExecutionId() + '.';

				log.debug(message);
				throw new TaskSubmissionException(message);
			}
		} catch (TaskSubmissionException e) {
			return FutureUtils.completedExceptionally(e);
		}
	}

	public  TaskExecutor(
			RpcService rpcService,
			TaskManagerConfiguration taskManagerConfiguration,
			HighAvailabilityServices haServices,
			TaskManagerServices taskExecutorServices,
			HeartbeatServices heartbeatServices,
			TaskManagerMetricGroup taskManagerMetricGroup,
			@Nullable String metricQueryServiceAddress,
			BlobCacheService blobCacheService,
			FatalErrorHandler fatalErrorHandler,
			PartitionTable<JobID> partitionTable);

}