org.apache.flink.runtime.state

Class TaskStateManagerImpl

java.lang.Object

org.apache.flink.runtime.state.TaskStateManagerImpl

All Implemented Interfaces:

AutoCloseable, CheckpointListener, TaskStateManager

public class TaskStateManagerImpl
extends Object
implements TaskStateManager

This class is the default implementation of TaskStateManager and collaborates with the job manager through CheckpointResponder) as well as a task-manager-local state store. Like this, client code does not have to deal with the differences between remote or local state on recovery because this class handles both cases transparently.

Reported state is tagged by clients so that this class can properly forward to the right receiver for the checkpointed state.

Constructor Summary

Constructors

Constructor and Description
TaskStateManagerImpl(JobID jobId, ExecutionAttemptID executionAttemptID, TaskLocalStateStore localStateStore, StateChangelogStorage<?> stateChangelogStorage, TaskExecutorStateChangelogStoragesManager changelogStoragesManager, JobManagerTaskRestore jobManagerTaskRestore, CheckpointResponder checkpointResponder)
TaskStateManagerImpl(JobID jobId, ExecutionAttemptID executionAttemptID, TaskLocalStateStore localStateStore, StateChangelogStorage<?> stateChangelogStorage, TaskExecutorStateChangelogStoragesManager changelogStoragesManager, JobManagerTaskRestore jobManagerTaskRestore, CheckpointResponder checkpointResponder, SequentialChannelStateReaderImpl sequentialChannelStateReader)

Method Summary

Modifier and Type	Method and Description
void	close()
LocalRecoveryConfig	createLocalRecoveryConfig() Returns the configuration for local recovery, i.e. the base directories for all file-based local state of the owning subtask and the general mode for local recovery.
InflightDataRescalingDescriptor	getInputRescalingDescriptor()
InflightDataRescalingDescriptor	getOutputRescalingDescriptor()
Optional<Long>	getRestoreCheckpointId() Acquires the checkpoint id to restore from.
SequentialChannelStateReader	getSequentialChannelStateReader()
StateChangelogStorage<?>	getStateChangelogStorage() Returns the configured state changelog storage for this task.
StateChangelogStorageView<?>	getStateChangelogStorageView(Configuration configuration, ChangelogStateHandle changelogStateHandle) Returns the state changelog storage view of given ChangelogStateHandle for this task.
boolean	isTaskDeployedAsFinished() Whether all the operators of the task are finished on restore.
void	notifyCheckpointAborted(long checkpointId) Tracking when some local state can be disposed.
void	notifyCheckpointComplete(long checkpointId) Tracking when local state can be confirmed and disposed.
PrioritizedOperatorSubtaskState	prioritizedOperatorState(OperatorID operatorID) Returns means to restore previously reported state of an operator running in the owning task.
void	reportIncompleteTaskStateSnapshots(CheckpointMetaData checkpointMetaData, CheckpointMetrics checkpointMetrics) Report the stats for state snapshots for an aborted checkpoint.
void	reportTaskStateSnapshots(CheckpointMetaData checkpointMetaData, CheckpointMetrics checkpointMetrics, TaskStateSnapshot acknowledgedState, TaskStateSnapshot localState) Report the state snapshots for the operator instances running in the owning task.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

TaskStateManagerImpl

public TaskStateManagerImpl(@Nonnull
                            JobID jobId,
                            @Nonnull
                            ExecutionAttemptID executionAttemptID,
                            @Nonnull
                            TaskLocalStateStore localStateStore,
                            @Nullable
                            StateChangelogStorage<?> stateChangelogStorage,
                            @Nonnull
                            TaskExecutorStateChangelogStoragesManager changelogStoragesManager,
                            @Nullable
                            JobManagerTaskRestore jobManagerTaskRestore,
                            @Nonnull
                            CheckpointResponder checkpointResponder)

TaskStateManagerImpl

public TaskStateManagerImpl(@Nonnull
                            JobID jobId,
                            @Nonnull
                            ExecutionAttemptID executionAttemptID,
                            @Nonnull
                            TaskLocalStateStore localStateStore,
                            @Nullable
                            StateChangelogStorage<?> stateChangelogStorage,
                            @Nonnull
                            TaskExecutorStateChangelogStoragesManager changelogStoragesManager,
                            @Nullable
                            JobManagerTaskRestore jobManagerTaskRestore,
                            @Nonnull
                            CheckpointResponder checkpointResponder,
                            @Nonnull
                            SequentialChannelStateReaderImpl sequentialChannelStateReader)

Method Detail

reportTaskStateSnapshots

public void reportTaskStateSnapshots(@Nonnull
                                     CheckpointMetaData checkpointMetaData,
                                     @Nonnull
                                     CheckpointMetrics checkpointMetrics,
                                     @Nullable
                                     TaskStateSnapshot acknowledgedState,
                                     @Nullable
                                     TaskStateSnapshot localState)

Description copied from interface: TaskStateManager

Report the state snapshots for the operator instances running in the owning task.

Specified by:

reportTaskStateSnapshots in interface TaskStateManager

Parameters:

checkpointMetaData - meta data from the checkpoint request.

checkpointMetrics - task level metrics for the checkpoint.

acknowledgedState - the reported states to acknowledge to the job manager.

localState - the reported states for local recovery.

reportIncompleteTaskStateSnapshots

public void reportIncompleteTaskStateSnapshots(CheckpointMetaData checkpointMetaData,
                                               CheckpointMetrics checkpointMetrics)

Description copied from interface: TaskStateManager

Report the stats for state snapshots for an aborted checkpoint.

Specified by:

reportIncompleteTaskStateSnapshots in interface TaskStateManager

Parameters:

checkpointMetaData - meta data from the checkpoint request.

checkpointMetrics - task level metrics for the checkpoint.

getInputRescalingDescriptor

public InflightDataRescalingDescriptor getInputRescalingDescriptor()

Specified by:

getInputRescalingDescriptor in interface TaskStateManager

getOutputRescalingDescriptor

public InflightDataRescalingDescriptor getOutputRescalingDescriptor()

Specified by:

getOutputRescalingDescriptor in interface TaskStateManager

isTaskDeployedAsFinished

public boolean isTaskDeployedAsFinished()

Description copied from interface: TaskStateManager

Whether all the operators of the task are finished on restore.

Specified by:

isTaskDeployedAsFinished in interface TaskStateManager

getRestoreCheckpointId

public Optional<Long> getRestoreCheckpointId()

Description copied from interface: TaskStateManager

Acquires the checkpoint id to restore from.

Specified by:

getRestoreCheckpointId in interface TaskStateManager

prioritizedOperatorState

public PrioritizedOperatorSubtaskState prioritizedOperatorState(OperatorID operatorID)

Description copied from interface: TaskStateManager

Returns means to restore previously reported state of an operator running in the owning task.

Specified by:

prioritizedOperatorState in interface TaskStateManager

Parameters:

operatorID - the id of the operator for which we request state.

Returns:

Previous state for the operator. The previous state can be empty if the operator had no previous state.

createLocalRecoveryConfig

@Nonnull
public LocalRecoveryConfig createLocalRecoveryConfig()

Description copied from interface: TaskStateManager

Returns the configuration for local recovery, i.e. the base directories for all file-based local state of the owning subtask and the general mode for local recovery.

Specified by:

createLocalRecoveryConfig in interface TaskStateManager

getSequentialChannelStateReader

public SequentialChannelStateReader getSequentialChannelStateReader()

Specified by:

getSequentialChannelStateReader in interface TaskStateManager

getStateChangelogStorage

@Nullable
public StateChangelogStorage<?> getStateChangelogStorage()

Description copied from interface: TaskStateManager

Returns the configured state changelog storage for this task.

Specified by:

getStateChangelogStorage in interface TaskStateManager

getStateChangelogStorageView

@Nullable
public StateChangelogStorageView<?> getStateChangelogStorageView(Configuration configuration,
                                                                           ChangelogStateHandle changelogStateHandle)

Description copied from interface: TaskStateManager

Returns the state changelog storage view of given ChangelogStateHandle for this task.

Specified by:

getStateChangelogStorageView in interface TaskStateManager

notifyCheckpointComplete

public void notifyCheckpointComplete(long checkpointId)
                              throws Exception

Tracking when local state can be confirmed and disposed.

Specified by:

notifyCheckpointComplete in interface CheckpointListener

Parameters:

checkpointId - The ID of the checkpoint that has been completed.

Throws:

Exception - This method can propagate exceptions, which leads to a failure/recovery for the task. Note that this will NOT lead to the checkpoint being revoked.

notifyCheckpointAborted

public void notifyCheckpointAborted(long checkpointId)

Tracking when some local state can be disposed.

Specified by:

notifyCheckpointAborted in interface CheckpointListener

Parameters:

checkpointId - The ID of the checkpoint that has been aborted.

close

public void close()
           throws Exception

Specified by:

close in interface AutoCloseable

Throws:

Exception