org.apache.flink.runtime.checkpoint

Class OperatorState

java.lang.Object

org.apache.flink.runtime.checkpoint.OperatorState

All Implemented Interfaces:

Serializable, CompositeStateHandle, StateObject

Direct Known Subclasses:

FullyFinishedOperatorState

public class OperatorState
extends Object
implements CompositeStateHandle

Simple container class which contains the raw/managed operator state and key-group state handles from all subtasks of an operator and therefore represents the complete state of a logical operator.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.flink.runtime.state.StateObject

StateObject.StateObjectLocation, StateObject.StateObjectSizeStatsCollector

Constructor Summary

Constructors

Constructor and Description
OperatorState(OperatorID operatorID, int parallelism, int maxParallelism)

Method Summary

Modifier and Type	Method and Description
void	collectSizeStats(StateObject.StateObjectSizeStatsCollector collector) Collects statistics about state size and location from the state object.
OperatorState	copyAndDiscardInFlightData()
OperatorState	copyWithNewOperatorID(OperatorID newOperatorId)
void	discardState() Discards the state referred to and solemnly owned by this handle, to free up resources in the persistent storage.
boolean	equals(Object obj)
long	getCheckpointedSize() Returns the persisted data size during checkpoint execution in bytes.
ByteStreamStateHandle	getCoordinatorState()
List<StateObject>	getDiscardables()
int	getMaxParallelism()
int	getNumberCollectedStates()
OperatorID	getOperatorID()
int	getParallelism()
OperatorSubtaskState	getState(int subtaskIndex)
Collection<OperatorSubtaskState>	getStates()
long	getStateSize() Returns the size of the state in bytes.
Map<Integer,OperatorSubtaskState>	getSubtaskStates()
int	hashCode()
boolean	hasSubtaskStates()
boolean	isFullyFinished()
void	putState(int subtaskIndex, OperatorSubtaskState subtaskState)
void	registerSharedStates(SharedStateRegistry sharedStateRegistry, long checkpointID) Register both newly created and already referenced shared states in the given SharedStateRegistry.
void	setCoordinatorState(ByteStreamStateHandle coordinatorState)
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

OperatorState

public OperatorState(OperatorID operatorID,
                     int parallelism,
                     int maxParallelism)

Method Detail

getOperatorID

public OperatorID getOperatorID()

isFullyFinished

public boolean isFullyFinished()

putState

public void putState(int subtaskIndex,
                     OperatorSubtaskState subtaskState)

getState

public OperatorSubtaskState getState(int subtaskIndex)

setCoordinatorState

public void setCoordinatorState(@Nullable
                                ByteStreamStateHandle coordinatorState)

getCoordinatorState

@Nullable
public ByteStreamStateHandle getCoordinatorState()

getSubtaskStates

public Map<Integer,OperatorSubtaskState> getSubtaskStates()

getStates

public Collection<OperatorSubtaskState> getStates()

getNumberCollectedStates

public int getNumberCollectedStates()

getParallelism

public int getParallelism()

getMaxParallelism

public int getMaxParallelism()

copyWithNewOperatorID

public OperatorState copyWithNewOperatorID(OperatorID newOperatorId)

copyAndDiscardInFlightData

public OperatorState copyAndDiscardInFlightData()

getDiscardables

public List<StateObject> getDiscardables()

discardState

public void discardState()
                  throws Exception

Description copied from interface: StateObject

Discards the state referred to and solemnly owned by this handle, to free up resources in the persistent storage. This method is called when the state represented by this object will not be used anymore.

Specified by:

discardState in interface StateObject

Throws:

Exception

registerSharedStates

public void registerSharedStates(SharedStateRegistry sharedStateRegistry,
                                 long checkpointID)

Description copied from interface: CompositeStateHandle

Register both newly created and already referenced shared states in the given SharedStateRegistry. This method is called when the checkpoint successfully completes or is recovered from failures.

After this is completed, newly created shared state is considered as published is no longer owned by this handle. This means that it should no longer be deleted as part of calls to StateObject.discardState(). Instead, StateObject.discardState() will trigger an unregistration from the registry.

Specified by:

registerSharedStates in interface CompositeStateHandle

Parameters:

sharedStateRegistry - The registry where shared states are registered.

hasSubtaskStates

public boolean hasSubtaskStates()

getStateSize

public long getStateSize()

Description copied from interface: StateObject

Returns the size of the state in bytes. If the size is not known, this method should return 0.

The values produced by this method are only used for informational purposes and for metrics/monitoring. If this method returns wrong values, the checkpoints and recovery will still behave correctly. However, efficiency may be impacted (wrong space pre-allocation) and functionality that depends on metrics (like monitoring) will be impacted.

Note for implementors: This method should not perform any I/O operations while obtaining the state size (hence it does not declare throwing an IOException). Instead, the state size should be stored in the state object, or should be computable from the state stored in this object. The reason is that this method is called frequently by several parts of the checkpointing and issuing I/O requests from this method accumulates a heavy I/O load on the storage system at higher scale.

Specified by:

getStateSize in interface StateObject

Returns:

Size of the state in bytes.

collectSizeStats

public void collectSizeStats(StateObject.StateObjectSizeStatsCollector collector)

Description copied from interface: StateObject

Collects statistics about state size and location from the state object.

Specified by:

collectSizeStats in interface StateObject

Parameters:

collector - the statistics collector.

getCheckpointedSize

public long getCheckpointedSize()

Description copied from interface: CompositeStateHandle

Returns the persisted data size during checkpoint execution in bytes. If incremental checkpoint is enabled, this value represents the incremental persisted data size, and usually smaller than StateObject.getStateSize(). If the size is unknown, this method would return same result as StateObject.getStateSize().

Specified by:

getCheckpointedSize in interface CompositeStateHandle

Returns:

The persisted data size during checkpoint execution in bytes.

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object