【Flink】Flink 1.12.2 源码浅析 : TaskExecutor

柔情只为你懂 2022-09-03 12:21 395阅读 0赞

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# 1.概述 #

转载：[Flink 1.12.2 源码浅析 : TaskExecutor][Flink 1.12.2 _ _ TaskExecutor]

TaskExecutor 是TaskManger的具体实现.

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# 二 .TaskExecutorGateway #

TaskExecutor 是TaskManager的具体实现, 首先看网关都实现了什么逻辑. 清单如下

## 2.1. 类图 ##

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## 2.2. 接口清单 ##

<table> 
 <thead> 
  <tr> 
   <th>名称</th> 
   <th align="left">描述</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>CompletableFuture requestSlot( <br> SlotID slotId,<br> JobID jobId,<br> AllocationID allocationId,<br> ResourceProfile resourceProfile,<br> String targetAddress,<br> ResourceManagerId resourceManagerId,<br> @RpcTimeout Time timeout)</td> 
   <td align="left">从TaskManager请求slot</td> 
  </tr> 
  <tr> 
   <td>requestTaskBackPressure</td> 
   <td align="left">获取任务背压相关信息</td> 
  </tr> 
  <tr> 
   <td>submitTask( TaskDeploymentDescriptor tdd, <br> JobMasterId jobMasterId,<br> @RpcTimeout Time timeout)</td> 
   <td align="left">[核心]<strong>提交任务</strong></td> 
  </tr> 
  <tr> 
   <td>updatePartitions</td> 
   <td align="left"><strong>更改任务的 分区</strong></td> 
  </tr> 
  <tr> 
   <td>releaseOrPromotePartitions</td> 
   <td align="left">批量发布/升级中间结果分区。</td> 
  </tr> 
  <tr> 
   <td>releaseClusterPartitions</td> 
   <td align="left">释放属于任何给定数据集的所有群集分区</td> 
  </tr> 
  <tr> 
   <td>triggerCheckpoint</td> 
   <td align="left">**触发给定任务的checkpoint。**checkpoint由checkpointID和checkpoint时间戳标识。</td> 
  </tr> 
  <tr> 
   <td>confirmCheckpoint</td> 
   <td align="left">确认给定任务的checkpoint。<br>checkpoint由checkpointID和checkpoint时间戳标识。</td> 
  </tr> 
  <tr> 
   <td>abortCheckpoint</td> 
   <td align="left">终止Checkpoint</td> 
  </tr> 
  <tr> 
   <td>cancelTask</td> 
   <td align="left">取消任务</td> 
  </tr> 
  <tr> 
   <td>heartbeatFromJobManager</td> 
   <td align="left">JobManager心跳请求</td> 
  </tr> 
  <tr> 
   <td>heartbeatFromResourceManager</td> 
   <td align="left">ResourceManager心跳请求</td> 
  </tr> 
  <tr> 
   <td>disconnectJobManager</td> 
   <td align="left">断开给定JobManager与TaskManager的连接。</td> 
  </tr> 
  <tr> 
   <td>disconnectResourceManager</td> 
   <td align="left">建立给定ResourceManager与TaskManager的连接。</td> 
  </tr> 
  <tr> 
   <td>freeSlot</td> 
   <td align="left">释放slot</td> 
  </tr> 
  <tr> 
   <td>requestFileUploadByType</td> 
   <td align="left">请求将指定类型的文件上载到集群的{@link BlobServer}。</td> 
  </tr> 
  <tr> 
   <td>requestFileUploadByName</td> 
   <td align="left">请求将指定名称的文件上载到集群的{@link BlobServer}。</td> 
  </tr> 
  <tr> 
   <td>requestMetricQueryServiceAddress</td> 
   <td align="left">返回TaskManager上度量查询服务的网关。</td> 
  </tr> 
  <tr> 
   <td>canBeReleased</td> 
   <td align="left">检查是否可以释放任务执行器。如果有未使用的结果分区，则不能释放它。</td> 
  </tr> 
  <tr> 
   <td>requestLogList</td> 
   <td align="left">请求TaskManager上的历史日志文件名。</td> 
  </tr> 
  <tr> 
   <td>sendOperatorEventToTask</td> 
   <td align="left">向Task发送Operator Event</td> 
  </tr> 
  <tr> 
   <td>requestThreadDump</td> 
   <td align="left">请求TaskManager 的thread dump 信息</td> 
  </tr> 
 </tbody> 
</table>

# 三 .代码浅析 #

## 3.1. 属性 ##

### 3.1.1. 服务相关 ###

// HA
        /** The access to the leader election and retrieval services. */
        private final HighAvailabilityServices haServices;
    
        // TaskExecutor 相关的服务比如: MemoryManager , IOManager ,ShuffleEnvironment 等等
        private final TaskManagerServices taskExecutorServices;
    
        /** * The task manager configuration. * */
        private final TaskManagerConfiguration taskManagerConfiguration;
    
        /** The fatal error handler to use in case of a fatal error. */
        private final FatalErrorHandler fatalErrorHandler;
    
        // BLOB缓存提供对永久和临时BLOB的BLOB服务的访问。
        private final BlobCacheService blobCacheService;
    
        private final LibraryCacheManager libraryCacheManager;
    
        /** The address to metric query service on this Task Manager. */
        @Nullable private final String metricQueryServiceAddress;

### 3.1.2. TaskManager相关服务 ###

/** * 此任务管理器的连接信息。 * The connection information of this task manager. */
        private final UnresolvedTaskManagerLocation unresolvedTaskManagerLocation;
    
        private final TaskManagerMetricGroup taskManagerMetricGroup;
    
        /** * 此任务的状态管理器，为每个插槽提供状态管理器。 * The state manager for this task, providing state managers per slot. */
        private final TaskExecutorLocalStateStoresManager localStateStoresManager;
    
        /** Information provider for external resources. */
        private final ExternalResourceInfoProvider externalResourceInfoProvider;
    
        /** The network component in the task manager. */
        private final ShuffleEnvironment<?, ?> shuffleEnvironment;
    
        /** The kvState registration service in the task manager. */
        private final KvStateService kvStateService;
    
        private final Executor ioExecutor;

### 3.1.3. 任务slot分配表 ###

private final TaskSlotTable<Task> taskSlotTable;
    
        private final JobTable jobTable;
    
        private final JobLeaderService jobLeaderService;
    
        private final LeaderRetrievalService resourceManagerLeaderRetriever;

### 3.1.4. resource manager 相关 ###

// resource manager 相关
        @Nullable private ResourceManagerAddress resourceManagerAddress;
    
        @Nullable private EstablishedResourceManagerConnection establishedResourceManagerConnection;
    
        @Nullable private TaskExecutorToResourceManagerConnection resourceManagerConnection;
    
        @Nullable private UUID currentRegistrationTimeoutId;
    
        private Map<JobID, Collection<CompletableFuture<ExecutionState>>>
                taskResultPartitionCleanupFuturesPerJob = new HashMap<>(8);

### 3.1.5. 其他 ###

// 硬件描述信息
        private final HardwareDescription hardwareDescription;
    
        // 内存配置信息
        private final TaskExecutorMemoryConfiguration memoryConfiguration;
    
        // 文件缓存
        private FileCache fileCache;
    
        // jobManager 心跳相关
        /** The heartbeat manager for job manager in the task manager. */
        private final HeartbeatManager<AllocatedSlotReport, TaskExecutorToJobManagerHeartbeatPayload>
                jobManagerHeartbeatManager;
    
        // resource manager 心跳相关
        /** The heartbeat manager for resource manager in the task manager. */
        private final HeartbeatManager<Void, TaskExecutorHeartbeatPayload>
                resourceManagerHeartbeatManager;
    
        // 分区相关
        private final TaskExecutorPartitionTracker partitionTracker;
    
        // 背压相关
        private final BackPressureSampleService backPressureSampleService;

## 3.2. 核心方法 ##

### 3.2.1. requestSlot ###

ResourceManager中的SlotManager的调用requestSlot接口向TaskExecutor请求slot .

org.apache.flink.runtime.taskexecutor.TaskExecutor\#requestSlot

@Override
        public CompletableFuture<Acknowledge> requestSlot(
                final SlotID slotId,
                final JobID jobId,
                final AllocationID allocationId,
                final ResourceProfile resourceProfile,
                final String targetAddress,
                final ResourceManagerId resourceManagerId,
                final Time timeout) { 
            // TODO: Filter invalid requests from the resource manager by using the
            // instance/registration Id
    
    
    
            // 输出日志信息
            // Receive slot request
            // 3755cb8f9962a9a7738db04f2a02084c
            // for job
            // 694474d11da6100e82744c9e47e2f511
            // from resource manager with leader id
            // 00000000000000000000000000000000.
    
            log.info(
                    "Receive slot request {} for job {} from resource manager with leader id {}.",
                    allocationId,
                    jobId,
                    resourceManagerId);
    
    
            // 是否连接到 ResourceManager
            if (!isConnectedToResourceManager(resourceManagerId)) { 
                final String message =
                        String.format(
                                "TaskManager is not connected to the resource manager %s.",
                                resourceManagerId);
                log.debug(message);
                return FutureUtils.completedExceptionally(new TaskManagerException(message));
            }
    
            try { 
    
                //[重点] 分配 slot
                allocateSlot(slotId, jobId, allocationId, resourceProfile);
            } catch (SlotAllocationException sae) { 
                return FutureUtils.completedExceptionally(sae);
            }
    
            final JobTable.Job job;
    
            try { 
    
                // 获取/构建 JobTable.Job
    
    
                job =jobTable.getOrCreateJob(jobId, () -> registerNewJobAndCreateServices(jobId, targetAddress));
    
    
    
            } catch (Exception e) { 
                // free the allocated slot
                try { 
                    taskSlotTable.freeSlot(allocationId);
                } catch (SlotNotFoundException slotNotFoundException) { 
                    // slot no longer existent, this should actually never happen, because we've
                    // just allocated the slot. So let's fail hard in this case!
                    onFatalError(slotNotFoundException);
                }
    
                // release local state under the allocation id.
                localStateStoresManager.releaseLocalStateForAllocationId(allocationId);
    
                // sanity check
                if (!taskSlotTable.isSlotFree(slotId.getSlotNumber())) { 
                    onFatalError(new Exception("Could not free slot " + slotId));
                }
    
                return FutureUtils.completedExceptionally(
                        new SlotAllocationException("Could not create new job.", e));
            }
    
            if (job.isConnected()) { 
    
                //[重要] 向JobManager提供Slot
                offerSlotsToJobManager(jobId);
            }
    
            return CompletableFuture.completedFuture(Acknowledge.get());
        }

org.apache.flink.runtime.taskexecutor.TaskExecutor\#allocateSlot(slotId, jobId, allocationId, resourceProfile);

private void allocateSlot(
                SlotID slotId, JobID jobId, AllocationID allocationId, ResourceProfile resourceProfile)
                throws SlotAllocationException { 
    
            // slotId = {SlotID@6055} "container_1619273419318_0032_01_000002_0"
            // resourceId = {ResourceID@6114} "container_1619273419318_0032_01_000002"
            // slotNumber = 0
            // jobId = {JobID@6056} "05fdf1bc744b274be1525c918c1ad378"
            // allocationId = {AllocationID@6057} "a9ce7abc6f1d6f264dbdce5564efcb76"
            // resourceProfile = {ResourceProfile@6058} "ResourceProfile{UNKNOWN}"
            // cpuCores = null
            // taskHeapMemory = null
            // taskOffHeapMemory = null
            // managedMemory = null
            // networkMemory = null
            // extendedResources = {HashMap@6116} size = 0
    
    
    
            // taskSlotTable = {TaskSlotTableImpl@6077}
            // numberSlots = 4
            // defaultSlotResourceProfile = {ResourceProfile@6124} "ResourceProfile{cpuCores=1.0000000000000000, taskHeapMemory=96.000mb (100663293 bytes), taskOffHeapMemory=0 bytes, managedMemory=128.000mb (134217730 bytes), networkMemory=32.000mb (33554432 bytes)}"
            // cpuCores = {CPUResource@6139} "Resource(CPU: 1.0000000000000000)"
            // taskHeapMemory = {MemorySize@6140} "100663293 bytes"
            // taskOffHeapMemory = {MemorySize@6141} "0 bytes"
            // managedMemory = {MemorySize@6142} "134217730 bytes"
            // networkMemory = {MemorySize@6143} "32 mb"
            // extendedResources = {HashMap@6144} size = 0
            // memoryPageSize = 32768
            // timerService = {TimerService@6125}
            // taskSlots = {HashMap@6126} size = 0
            // allocatedSlots = {HashMap@6127} size = 0
            // taskSlotMappings = {HashMap@6128} size = 0
            // slotsPerJob = {HashMap@6129} size = 0
            // slotActions = {TaskExecutor$SlotActionsImpl@6130}
            // state = {TaskSlotTableImpl$State@6131} "RUNNING"
            // budgetManager = {ResourceBudgetManager@6132}
            // closingFuture = {CompletableFuture@6133} "java.util.concurrent.CompletableFuture@9a6e076[Not completed]"
            // mainThreadExecutor = {RpcEndpoint$MainThreadExecutor@6096}
            // memoryVerificationExecutor = {ThreadPoolExecutor@6076} "java.util.concurrent.ThreadPoolExecutor@da5c1a9[Running, pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 0]"
            // if (taskSlotTable.isSlotFree(slotId.getSlotNumber())) { 
    
    
            if (taskSlotTable.isSlotFree(slotId.getSlotNumber())) { 
    
    
                // 进行分配操作..
                // TaskSlotTableImpl # allocateSlot
                if (taskSlotTable.allocateSlot(
                        slotId.getSlotNumber(),
                        jobId,
                        allocationId,
                        resourceProfile,
                        taskManagerConfiguration.getTimeout())) { 
    
    
                    // Allocated slot for 3755cb8f9962a9a7738db04f2a02084c.
                    log.info("Allocated slot for {}.", allocationId);
                } else { 
                    log.info("Could not allocate slot for {}.", allocationId);
                    throw new SlotAllocationException("Could not allocate slot.");
                }
            } else if (!taskSlotTable.isAllocated(slotId.getSlotNumber(), jobId, allocationId)) { 
                final String message =
                        "The slot " + slotId + " has already been allocated for a different job.";
    
                log.info(message);
    
                final AllocationID allocationID =
                        taskSlotTable.getCurrentAllocation(slotId.getSlotNumber());
                throw new SlotOccupiedException(
                        message, allocationID, taskSlotTable.getOwningJob(allocationID));
            }
        }

org.apache.flink.runtime.taskexecutor.TaskExecutor\#offerSlotsToJobManager(jobId);

// ------------------------------------------------------------------------
        // Internal job manager connection methods
        // ------------------------------------------------------------------------
    
        private void offerSlotsToJobManager(final JobID jobId) { 
            // 向JobManager提供Slot : internalOfferSlotsToJobManager
            jobTable.getConnection(jobId).ifPresent(this::internalOfferSlotsToJobManager);
        }
    
    
        private void internalOfferSlotsToJobManager(JobTable.Connection jobManagerConnection) { 
            // 获取JobID
            final JobID jobId = jobManagerConnection.getJobId();
    
            // JobID是否已经分配
            if (taskSlotTable.hasAllocatedSlots(jobId)) { 
    
                // Offer reserved slots to the leader of job 694474d11da6100e82744c9e47e2f511.
                log.info("Offer reserved slots to the leader of job {}.", jobId);
    
                // 获取JobMaster 的 Gateway
                final JobMasterGateway jobMasterGateway = jobManagerConnection.getJobManagerGateway();
    
                // 获取 分配给jobId 的所有 TaskSlot
                final Iterator<TaskSlot<Task>> reservedSlotsIterator =  taskSlotTable.getAllocatedSlots(jobId);
    
                // 获取 JobMasterId
                final JobMasterId jobMasterId = jobManagerConnection.getJobMasterId();
    
                // 保留的Slot
                final Collection<SlotOffer> reservedSlots = new HashSet<>(2);
    
                while (reservedSlotsIterator.hasNext()) { 
                    SlotOffer offer = reservedSlotsIterator.next().generateSlotOffer();
                    reservedSlots.add(offer);
                }
    
                // offerSlots
                // Offers the given slots to the job manager.
                // The response contains the set of accepted slots.
    
                // JobMaster#offerSlots
                CompletableFuture<Collection<SlotOffer>> acceptedSlotsFuture =
                        jobMasterGateway.offerSlots(
                                getResourceID(), reservedSlots, taskManagerConfiguration.getTimeout());
    
    
                // 异步操作. 处理响应请求,处理异常 || 标记为 slot 状态为active
                acceptedSlotsFuture.whenCompleteAsync(
                        handleAcceptedSlotOffers(jobId, jobMasterGateway, jobMasterId, reservedSlots),
                        getMainThreadExecutor());
            } else { 
                log.debug("There are no unassigned slots for the job {}.", jobId);
            }
        }

### 3.2.2. freeSlot ###

Frees the slot with the given allocation ID.

@Override
        public CompletableFuture<Acknowledge> freeSlot(
                AllocationID allocationId, Throwable cause, Time timeout) { 
            freeSlotInternal(allocationId, cause);
    
            return CompletableFuture.completedFuture(Acknowledge.get());
        }
    	
    	
        private void freeSlotInternal(AllocationID allocationId, Throwable cause) { 
            checkNotNull(allocationId);
    
            log.debug("Free slot with allocation id {} because: {}", allocationId, cause.getMessage());
    
            try { 
                final JobID jobId = taskSlotTable.getOwningJob(allocationId);
    
                // 获取slot 索引的下标.
                final int slotIndex = taskSlotTable.freeSlot(allocationId, cause);
    
                if (slotIndex != -1) { 
    
                    if (isConnectedToResourceManager()) { 
                        // 获取ResourceManager
                        // the slot was freed. Tell the RM about it
                        ResourceManagerGateway resourceManagerGateway =
                                establishedResourceManagerConnection.getResourceManagerGateway();
                        // 通知RM slot释放.
                        resourceManagerGateway.notifySlotAvailable(
                                establishedResourceManagerConnection.getTaskExecutorRegistrationId(),
                                new SlotID(getResourceID(), slotIndex),
                                allocationId);
                    }
    
                    if (jobId != null) { 
                        closeJobManagerConnectionIfNoAllocatedResources(jobId);
                    }
                }
            } catch (SlotNotFoundException e) { 
                log.debug("Could not free slot for allocation id {}.", allocationId, e);
            }
    
            // 本地存储清空
            localStateStoresManager.releaseLocalStateForAllocationId(allocationId);
        }

### 3.2.3. submitTask ###

核心的就是构造一个Task, 然后交由线程Thread执行.

// ----------------------------------------------------------------------
        // Task lifecycle RPCs
        // 提交 任务 !!!
        // ----------------------------------------------------------------------
    
        @Override
        public CompletableFuture<Acknowledge> submitTask(
                TaskDeploymentDescriptor tdd, JobMasterId jobMasterId, Time timeout) { 
    
            try { 
                final JobID jobId = tdd.getJobId();
                final ExecutionAttemptID executionAttemptID = tdd.getExecutionAttemptId();
    
                final JobTable.Connection jobManagerConnection =
                        jobTable.getConnection(jobId)
                                .orElseThrow(
                                        () -> { 
                                            final String message =
                                                    "Could not submit task because there is no JobManager "
                                                            + "associated for the job "
                                                            + jobId
                                                            + '.';
    
                                            log.debug(message);
                                            return 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());
    
                final TaskOperatorEventGateway taskOperatorEventGateway =
                        new RpcTaskOperatorEventGateway(
                                jobManagerConnection.getJobManagerGateway(),
                                executionAttemptID,
                                (t) -> runAsync(() -> failTask(executionAttemptID, t)));
    
                TaskManagerActions taskManagerActions = jobManagerConnection.getTaskManagerActions();
                CheckpointResponder checkpointResponder = jobManagerConnection.getCheckpointResponder();
                GlobalAggregateManager aggregateManager =
                        jobManagerConnection.getGlobalAggregateManager();
    
                LibraryCacheManager.ClassLoaderHandle classLoaderHandle =
                        jobManagerConnection.getClassLoaderHandle();
                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();
    
                // 构造 TaskStateManager
                final TaskStateManager taskStateManager =
                        new TaskStateManagerImpl(
                                jobId,
                                tdd.getExecutionAttemptId(),
                                localStateStore,
                                taskRestore,
                                checkpointResponder);
    
                MemoryManager memoryManager;
                try { 
                    memoryManager = taskSlotTable.getTaskMemoryManager(tdd.getAllocationId());
                } catch (SlotNotFoundException e) { 
                    throw new TaskSubmissionException("Could not submit task.", e);
                }
    
                // 构造一个新的Task
                Task task =
                        new Task(
                                jobInformation,
                                taskInformation,
                                tdd.getExecutionAttemptId(),
                                tdd.getAllocationId(),
                                tdd.getSubtaskIndex(),
                                tdd.getAttemptNumber(),
                                tdd.getProducedPartitions(),
                                tdd.getInputGates(),
                                tdd.getTargetSlotNumber(),
                                memoryManager,
                                taskExecutorServices.getIOManager(),
                                taskExecutorServices.getShuffleEnvironment(),
                                taskExecutorServices.getKvStateService(),
                                taskExecutorServices.getBroadcastVariableManager(),
                                taskExecutorServices.getTaskEventDispatcher(),
                                externalResourceInfoProvider,
                                taskStateManager,
                                taskManagerActions,
                                inputSplitProvider,
                                checkpointResponder,
                                taskOperatorEventGateway,
                                aggregateManager,
                                classLoaderHandle,
                                fileCache,
                                taskManagerConfiguration,
                                taskMetricGroup,
                                resultPartitionConsumableNotifier,
                                partitionStateChecker,
                                getRpcService().getExecutor());
    
                taskMetricGroup.gauge(MetricNames.IS_BACKPRESSURED, task::isBackPressured);
    
                // Received task
                // Window(
                // TumblingProcessingTimeWindows(5000),
                // ProcessingTimeTrigger,
                // ReduceFunction$1, PassThroughWindowFunction
                // ) ->
                // Sink: Print to Std. Out (1/1)#0 (141dd597dc560a831b2b4bc195943f0b),
                //
                // deploy into slot with allocation id
                // 3755cb8f9962a9a7738db04f2a02084c.
    
                log.info(
                        "Received task {} ({}), deploy into slot with allocation id {}.",
                        task.getTaskInfo().getTaskNameWithSubtasks(),
                        tdd.getExecutionAttemptId(),
                        tdd.getAllocationId());
    
                boolean taskAdded;
    
                try { 
                    taskAdded = taskSlotTable.addTask(task);
                } catch (SlotNotFoundException | SlotNotActiveException e) { 
                    throw new TaskSubmissionException("Could not submit task.", e);
                }
    
                if (taskAdded) { 
                    // 启动线程
                    task.startTaskThread();
    
                    setupResultPartitionBookkeeping(
                            tdd.getJobId(), tdd.getProducedPartitions(), 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);
            }
        }

### 3.2.4. updatePartitions ###

根据分区信息 org.apache.flink.runtime.io.network.NettyShuffleEnvironment\#updatePartitionInfo 同步分区相关信息.

@Override
        public CompletableFuture<Acknowledge> updatePartitions(
                final ExecutionAttemptID executionAttemptID,
                Iterable<PartitionInfo> partitionInfos,
                Time timeout) { 
            // 获取任务
            final Task task = taskSlotTable.getTask(executionAttemptID);
    
            if (task != null) { 
    
                // 迭代分区信息
                for (final PartitionInfo partitionInfo : partitionInfos) { 
                    // Run asynchronously because it might be blocking
                    FutureUtils.assertNoException(
                            CompletableFuture.runAsync(
                                    () -> { 
                                        try { 
                                            // 更改分区信息
                                            if (!shuffleEnvironment.updatePartitionInfo( executionAttemptID, partitionInfo)) { 
                                                log.debug(
                                                        "Discard update for input gate partition {} of result {} in task {}. "
                                                                + "The partition is no longer available.",
                                                        partitionInfo
                                                                .getShuffleDescriptor()
                                                                .getResultPartitionID(),
                                                        partitionInfo.getIntermediateDataSetID(),
                                                        executionAttemptID);
                                            }
                                        } catch (IOException | InterruptedException e) { 
                                            log.error(
                                                    "Could not update input data location for task {}. Trying to fail task.",
                                                    task.getTaskInfo().getTaskName(),
                                                    e);
                                            task.failExternally(e);
                                        }
                                    },
                                    getRpcService().getExecutor()));
                }
                return CompletableFuture.completedFuture(Acknowledge.get());
            } else { 
                log.debug(
                        "Discard update for input partitions of task {}. Task is no longer running.",
                        executionAttemptID);
                return CompletableFuture.completedFuture(Acknowledge.get());
            }
        }

### 3.2.5. triggerCheckpoint ###

最终是调用task的triggerCheckpointBarrier方法, 触发Checkpoint .

@Override
        public CompletableFuture<Acknowledge> triggerCheckpoint(
                ExecutionAttemptID executionAttemptID,
                long checkpointId,
                long checkpointTimestamp,
                CheckpointOptions checkpointOptions) { 
            log.debug(
                    "Trigger checkpoint {}@{} for {}.",
                    checkpointId,
                    checkpointTimestamp,
                    executionAttemptID);
    
            // 获取CheckpointType
            final CheckpointType checkpointType = checkpointOptions.getCheckpointType();
    
    
            if (checkpointType.getPostCheckpointAction() == PostCheckpointAction.TERMINATE
                    && !(checkpointType.isSynchronous() && checkpointType.isSavepoint())) { 
                throw new IllegalArgumentException(
                        "Only synchronous savepoints are allowed to advance the watermark to MAX.");
            }
    
            // 获取任务
            final Task task = taskSlotTable.getTask(executionAttemptID);
    
            if (task != null) { 
                // 调用task的triggerCheckpointBarrier方法, 触发chckpoint
                task.triggerCheckpointBarrier(checkpointId, checkpointTimestamp, checkpointOptions);
    
                return CompletableFuture.completedFuture(Acknowledge.get());
            } else { 
                final String message =
                        "TaskManager received a checkpoint request for unknown task "
                                + executionAttemptID
                                + '.';
    
                log.debug(message);
                return FutureUtils.completedExceptionally(
                        new CheckpointException(
                                message, CheckpointFailureReason.TASK_CHECKPOINT_FAILURE));
            }
        }

### 3.2.6. confirmCheckpoint ###

通过task的 notifyCheckpointComplete 方法 . Checkpoint完成

@Override
        public CompletableFuture<Acknowledge> confirmCheckpoint(
                ExecutionAttemptID executionAttemptID, long checkpointId, long checkpointTimestamp) { 
            log.debug(
                    "Confirm checkpoint {}@{} for {}.",
                    checkpointId,
                    checkpointTimestamp,
                    executionAttemptID);
    
            final Task task = taskSlotTable.getTask(executionAttemptID);
    
            if (task != null) { 
                // 通过task的 notifyCheckpointComplete 方法 . Checkpoint完成
                task.notifyCheckpointComplete(checkpointId);
    
                return CompletableFuture.completedFuture(Acknowledge.get());
            } else { 
                final String message =
                        "TaskManager received a checkpoint confirmation for unknown task "
                                + executionAttemptID
                                + '.';
    
                log.debug(message);
                return FutureUtils.completedExceptionally(
                        new CheckpointException(
                                message,
                                CheckpointFailureReason.UNKNOWN_TASK_CHECKPOINT_NOTIFICATION_FAILURE));
            }
        }

### 3.2.7. abortCheckpoint ###

通过task的 notifyCheckpointAborted 方法 . Checkpoint取消

@Override
        public CompletableFuture<Acknowledge> abortCheckpoint(
                ExecutionAttemptID executionAttemptID, long checkpointId, long checkpointTimestamp) { 
            log.debug(
                    "Abort checkpoint {}@{} for {}.",
                    checkpointId,
                    checkpointTimestamp,
                    executionAttemptID);
    
            final Task task = taskSlotTable.getTask(executionAttemptID);
    
            if (task != null) { 
                // abortCheckpoint
                task.notifyCheckpointAborted(checkpointId);
    
                return CompletableFuture.completedFuture(Acknowledge.get());
            } else { 
                final String message =
                        "TaskManager received an aborted checkpoint for unknown task "
                                + executionAttemptID
                                + '.';
    
                log.debug(message);
                return FutureUtils.completedExceptionally(
                        new CheckpointException(
                                message,
                                CheckpointFailureReason.UNKNOWN_TASK_CHECKPOINT_NOTIFICATION_FAILURE));
            }
        }

### 3.2.8. heartbeatFromJobManager ###

JobManager的心跳相关信息

@Override
        public void heartbeatFromJobManager(
                ResourceID resourceID, AllocatedSlotReport allocatedSlotReport) { 
            jobManagerHeartbeatManager.requestHeartbeat(resourceID, allocatedSlotReport);
        }

### 3.2.9. heartbeatFromResourceManager ###

ResourceManager的心跳相关信息

@Override
        public void heartbeatFromResourceManager(ResourceID resourceID) { 
            resourceManagerHeartbeatManager.requestHeartbeat(resourceID, null);
        }

### 3.2.10. requestFileUploadByType ###

根据类型请求文件的上传路径…

@Override
        public CompletableFuture<TransientBlobKey> requestFileUploadByType(
                FileType fileType, Time timeout) { 
            final String filePath;
            switch (fileType) { 
                case LOG:
                    filePath = taskManagerConfiguration.getTaskManagerLogPath();
                    break;
                case STDOUT:
                    filePath = taskManagerConfiguration.getTaskManagerStdoutPath();
                    break;
                default:
                    filePath = null;
            }
            return requestFileUploadByFilePath(filePath, fileType.toString());
        }

### 3.2.11. requestFileUploadByName ###

@Override
        public CompletableFuture<TransientBlobKey> requestFileUploadByName(
                String fileName, Time timeout) { 
            final String filePath;
            final String logDir = taskManagerConfiguration.getTaskManagerLogDir();
    
            if (StringUtils.isNullOrWhitespaceOnly(logDir)
                    || StringUtils.isNullOrWhitespaceOnly(fileName)) { 
                filePath = null;
            } else { 
                // 根据 taskManagerLogDir + 文件的名字 获取路径
                filePath = new File(logDir, new File(fileName).getName()).getPath();
            }
            return requestFileUploadByFilePath(filePath, fileName);
        }

### 3.2.12. sendOperatorEventToTask ###

@Override
        public CompletableFuture<Acknowledge> sendOperatorEventToTask(
                ExecutionAttemptID executionAttemptID,
                OperatorID operatorId,
                SerializedValue<OperatorEvent> evt) { 
    
            log.debug("Operator event for {} - {}", executionAttemptID, operatorId);
    
            // 获取Task
            final Task task = taskSlotTable.getTask(executionAttemptID);
            if (task == null) { 
                return FutureUtils.completedExceptionally(
                        new TaskNotRunningException(
                                "Task " + executionAttemptID + " not running on TaskManager"));
            }
    
            try { 
                // 发送 OperatorEvent 给 task
                task.deliverOperatorEvent(operatorId, evt);
    
                return CompletableFuture.completedFuture(Acknowledge.get());
            } catch (Throwable t) { 
                ExceptionUtils.rethrowIfFatalError(t);
                return FutureUtils.completedExceptionally(t);
            }
        }

### 3.2.13. requestThreadDump ###

请求获取Thread线程的信息…

@Override
        public CompletableFuture<ThreadDumpInfo> requestThreadDump(Time timeout) { 
            final Collection<ThreadInfo> threadDump = JvmUtils.createThreadDump();
    
            final Collection<ThreadDumpInfo.ThreadInfo> threadInfos =
                    threadDump.stream()
                            .map(
                                    threadInfo ->
                                            ThreadDumpInfo.ThreadInfo.create(
                                                    threadInfo.getThreadName(), threadInfo.toString()))
                            .collect(Collectors.toList());
    
            return CompletableFuture.completedFuture(ThreadDumpInfo.create(threadInfos));
        }

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[Flink 1.12.2 _ _ TaskExecutor]: https://zhangboyi.blog.csdn.net/article/details/116272628
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