Uses of Package
org.apache.flink.runtime.state

Packages that use org.apache.flink.runtime.state

Package	Description
org.apache.flink.runtime.asyncprocessing.operators
org.apache.flink.runtime.asyncprocessing.operators.windowing
org.apache.flink.runtime.checkpoint
org.apache.flink.runtime.checkpoint.channel
org.apache.flink.runtime.checkpoint.filemerging
org.apache.flink.runtime.checkpoint.metadata
org.apache.flink.runtime.dispatcher.cleanup
org.apache.flink.runtime.execution
org.apache.flink.runtime.executiongraph
org.apache.flink.runtime.jobgraph.tasks
org.apache.flink.runtime.jobmaster
org.apache.flink.runtime.persistence
org.apache.flink.runtime.persistence.filesystem
org.apache.flink.runtime.query
org.apache.flink.runtime.scheduler
org.apache.flink.runtime.scheduler.adaptive
org.apache.flink.runtime.scheduler.adaptive.allocator
org.apache.flink.runtime.source.coordinator
org.apache.flink.runtime.state
org.apache.flink.runtime.state.changelog
org.apache.flink.runtime.state.changelog.inmemory
org.apache.flink.runtime.state.delegate
org.apache.flink.runtime.state.filemerging
org.apache.flink.runtime.state.filesystem
org.apache.flink.runtime.state.hashmap
org.apache.flink.runtime.state.heap	This package contains the classes for key/value state backends that store the state on the JVM heap as objects.
org.apache.flink.runtime.state.internal	This package holds the classes of the internal state type hierarchy.
org.apache.flink.runtime.state.memory
org.apache.flink.runtime.state.restore
org.apache.flink.runtime.state.storage
org.apache.flink.runtime.state.ttl
org.apache.flink.runtime.state.v2
org.apache.flink.runtime.state.v2.adaptor
org.apache.flink.runtime.state.v2.ttl
org.apache.flink.runtime.taskexecutor
org.apache.flink.runtime.taskexecutor.rpc
org.apache.flink.runtime.taskmanager
org.apache.flink.runtime.util
org.apache.flink.runtime.zookeeper
org.apache.flink.streaming.api
org.apache.flink.streaming.api.checkpoint
org.apache.flink.streaming.api.functions.co
org.apache.flink.streaming.api.functions.source
org.apache.flink.streaming.api.functions.source.legacy
org.apache.flink.streaming.api.graph
org.apache.flink.streaming.api.operators
org.apache.flink.streaming.api.operators.co
org.apache.flink.streaming.api.operators.collect
org.apache.flink.streaming.api.operators.sorted.state
org.apache.flink.streaming.runtime.operators.sink
org.apache.flink.streaming.runtime.operators.windowing
org.apache.flink.streaming.runtime.tasks
org.apache.flink.streaming.util.functions

Classes in org.apache.flink.runtime.state used by org.apache.flink.runtime.asyncprocessing.operators

Class	Description
AsyncKeyedStateBackend	An async keyed state backend provides methods supporting to access keyed state asynchronously and in batch.
StateInitializationContext	This interface provides a context in which operators can initialize by registering to managed state (i.e. state that is managed by state backends) or iterating over streams of state partitions written as raw state in a previous snapshot.
StateSnapshotContext	This interface provides a context in which operators that use managed (i.e. state that is managed by state backends) or raw (i.e. the operator can write it's state streams) state can perform a snapshot.
VoidNamespace	Singleton placeholder class for state without a namespace.

Classes in org.apache.flink.runtime.state used by org.apache.flink.runtime.asyncprocessing.operators.windowing

Class	Description
AsyncKeyedStateBackend	An async keyed state backend provides methods supporting to access keyed state asynchronously and in batch.
DefaultKeyedStateStore	Default implementation of KeyedStateStore that currently forwards state registration to a RuntimeContext.

Classes in org.apache.flink.runtime.state used by org.apache.flink.runtime.checkpoint

Class	Description
ChainedStateHandle	Handle to state handles for the operators in an operator chain.
CheckpointStorage	CheckpointStorage defines how StateBackend's store their state for fault tolerance in streaming applications.
CheckpointStorageCoordinatorView	This interface creates a CheckpointStorageLocation to which an individual checkpoint or savepoint is stored.
CheckpointStorageLocation	A storage location for one particular checkpoint, offering data persistent, metadata persistence, and lifecycle/cleanup methods.
CheckpointStorageLocationReference	A reference to a storage location.
CompletedCheckpointStorageLocation	The CompletedCheckpointStorageLocation describes the storage aspect of a completed checkpoint.
CompositeStateHandle	Base of all snapshots that are taken by StateBackends and some other components in tasks.
InputChannelStateHandle	Handle to an InputChannel state.
KeyedStateHandle	Base for the handles of the checkpointed states in keyed streams.
KeyGroupRange	This class defines a range of key-group indexes.
OperatorStateHandle	Interface of a state handle for operator state.
ResultSubpartitionStateHandle	Handle to a ResultSubpartition state.
SharedStateRegistry	This registry manages state that is shared across (incremental) checkpoints, and is responsible for deleting shared state that is no longer used in any valid checkpoint.
SharedStateRegistryFactory	Simple factory to produce SharedStateRegistry objects.
StateBackend	A State Backend defines how the state of a streaming application is stored locally within the cluster.
StateObject	Base of all handles that represent checkpointed state in some form.
StateObject.StateObjectSizeStatsCollector	Collector for size and location stats from a state object via StateObject.collectSizeStats(StateObjectSizeStatsCollector).
StreamStateHandle	A StateObject that represents state that was written to a stream.

Classes in org.apache.flink.runtime.state used by org.apache.flink.runtime.checkpoint.channel

Class	Description
AbstractChannelStateHandle.StateContentMetaInfo	Describes the underlying content.
CheckpointStorageWorkerView	This interface implements the durable storage of checkpoint data and metadata streams.
InputChannelStateHandle	Handle to an InputChannel state.
ResultSubpartitionStateHandle	Handle to a ResultSubpartition state.
StreamStateHandle	A StateObject that represents state that was written to a stream.

Classes in org.apache.flink.runtime.state used by org.apache.flink.runtime.checkpoint.filemerging

Class	Description
CheckpointedStateScope	The scope for a chunk of checkpointed state.
StreamStateHandle	A StateObject that represents state that was written to a stream.

Classes in org.apache.flink.runtime.state used by org.apache.flink.runtime.checkpoint.metadata

Class	Description
InputChannelStateHandle	Handle to an InputChannel state.
KeyedStateHandle	Base for the handles of the checkpointed states in keyed streams.
OperatorStateHandle	Interface of a state handle for operator state.
ResultSubpartitionStateHandle	Handle to a ResultSubpartition state.
StreamStateHandle	A StateObject that represents state that was written to a stream.

Classes in org.apache.flink.runtime.state used by org.apache.flink.runtime.dispatcher.cleanup

Class	Description
SharedStateRegistryFactory	Simple factory to produce SharedStateRegistry objects.

Classes in org.apache.flink.runtime.state used by org.apache.flink.runtime.execution

Class	Description
CheckpointStorageAccess	Implementations of this interface should implement methods acting as an administration role for checkpoint storage, which defined in CheckpointStorageCoordinatorView.
TaskStateManager	This interface provides methods to report and retrieve state for a task.

Classes in org.apache.flink.runtime.state used by org.apache.flink.runtime.executiongraph

Class	Description
CheckpointStorage	CheckpointStorage defines how StateBackend's store their state for fault tolerance in streaming applications.
StateBackend	A State Backend defines how the state of a streaming application is stored locally within the cluster.

Classes in org.apache.flink.runtime.state used by org.apache.flink.runtime.jobgraph.tasks

Class	Description
CheckpointStorage	CheckpointStorage defines how StateBackend's store their state for fault tolerance in streaming applications.
StateBackend	A State Backend defines how the state of a streaming application is stored locally within the cluster.

Classes in org.apache.flink.runtime.state used by org.apache.flink.runtime.jobmaster

Class	Description
KeyGroupRange	This class defines a range of key-group indexes.

Classes in org.apache.flink.runtime.state used by org.apache.flink.runtime.persistence

Class	Description
RetrievableStateHandle	Handle to state that can be read back again via RetrievableStateHandle.retrieveState().

Classes in org.apache.flink.runtime.state used by org.apache.flink.runtime.persistence.filesystem

Class	Description
RetrievableStateHandle	Handle to state that can be read back again via RetrievableStateHandle.retrieveState().

Classes in org.apache.flink.runtime.state used by org.apache.flink.runtime.query

Class	Description
KeyGroupRange	This class defines a range of key-group indexes.

Classes in org.apache.flink.runtime.state used by org.apache.flink.runtime.scheduler

Class	Description
KeyGroupRange	This class defines a range of key-group indexes.

Classes in org.apache.flink.runtime.state used by org.apache.flink.runtime.scheduler.adaptive

Class	Description
KeyGroupRange	This class defines a range of key-group indexes.

Classes in org.apache.flink.runtime.state used by org.apache.flink.runtime.scheduler.adaptive.allocator

Class	Description
KeyGroupRange	This class defines a range of key-group indexes.

Classes in org.apache.flink.runtime.state used by org.apache.flink.runtime.source.coordinator

Class	Description
PriorityComparable	Interface for objects that can be compared by priority.

Classes in org.apache.flink.runtime.state used by org.apache.flink.runtime.state

Class	Description
AbstractChannelStateHandle	Abstract channel state handle.
AbstractChannelStateHandle.StateContentMetaInfo	Describes the underlying content.
AbstractIncrementalStateHandle	Abstract superclass for all IncrementalKeyedStateHandle.
AbstractKeyedStateBackend	Base implementation of KeyedStateBackend.
AbstractKeyedStateBackend.PartitionStateFactory
AbstractStateBackend	An abstract base implementation of the StateBackend interface.
ArrayListSerializer
AsyncKeyedStateBackend	An async keyed state backend provides methods supporting to access keyed state asynchronously and in batch.
AsyncSnapshotCallable.AsyncSnapshotTask	FutureTask that wraps a AsyncSnapshotCallable and connects it with cancellation and closing.
BackendBuildingException	Exceptions which indicate that a state backend building has failed.
BackendWritableBroadcastState	An interface with methods related to the interplay between the Broadcast State and the OperatorStateBackend.
ChainedStateHandle	Handle to state handles for the operators in an operator chain.
CheckpointableKeyedStateBackend	Interface that combines both, the KeyedStateBackend interface, which encapsulates methods responsible for keyed state management and the Snapshotable which tells the system how to snapshot the underlying state.
CheckpointBoundKeyedStateHandle	KeyedStateHandle that is bound to a specific checkpoint.
CheckpointedStateScope	The scope for a chunk of checkpointed state.
CheckpointMetadataOutputStream	An output stream for checkpoint metadata.
CheckpointStateOutputStream	A dedicated output stream that produces a StreamStateHandle when closed.
CheckpointStateToolset	A toolset of operations that can be performed on a location embedded within the class.
CheckpointStorage	CheckpointStorage defines how StateBackend's store their state for fault tolerance in streaming applications.
CheckpointStorageAccess	Implementations of this interface should implement methods acting as an administration role for checkpoint storage, which defined in CheckpointStorageCoordinatorView.
CheckpointStorageCoordinatorView	This interface creates a CheckpointStorageLocation to which an individual checkpoint or savepoint is stored.
CheckpointStorageLocation	A storage location for one particular checkpoint, offering data persistent, metadata persistence, and lifecycle/cleanup methods.
CheckpointStorageLocationReference	A reference to a storage location.
CheckpointStorageWorkerView	This interface implements the durable storage of checkpoint data and metadata streams.
CheckpointStreamFactory	A factory for checkpoint output streams, which are used to persist data for checkpoints.
CheckpointStreamWithResultProvider	Interface that provides access to a CheckpointStateOutputStream and a method to provide the SnapshotResult.
CheckpointStreamWithResultProvider.KeyedStateHandleFactory	Factory method for a KeyedStateHandle to be used in CheckpointStreamWithResultProvider.toKeyedStateHandleSnapshotResult(SnapshotResult, KeyGroupRangeOffsets, KeyedStateHandleFactory).
CompletedCheckpointStorageLocation	The CompletedCheckpointStorageLocation describes the storage aspect of a completed checkpoint.
CompositeStateHandle	Base of all snapshots that are taken by StateBackends and some other components in tasks.
DefaultOperatorStateBackend	Default implementation of OperatorStateStore that provides the ability to make snapshots.
DirectoryStateHandle	This state handle represents a directory.
DoneFuture	A Future that is always done and will just yield the object that was given at creation time.
DuplicatingCheckpointOutputStream	A CheckpointStateOutputStream that wraps a primary and a secondary CheckpointStateOutputStream and duplicates all writes into both streams.
FileMergingSnapshotManagerClosableWrapper	A wrapper that wraps FileMergingSnapshotManager and a Closeable.
FullSnapshotResources	A SnapshotResources to be used with the backend-independent FullSnapshotAsyncWriter.
FunctionInitializationContext	This interface provides a context in which user functions can initialize by registering to managed state (i.e. state that is managed by state backends).
FunctionSnapshotContext	This interface provides a context in which user functions that use managed state (i.e. state that is managed by state backends) can participate in a snapshot.
HeapBroadcastState	A Broadcast State backed a heap-based Map.
IncrementalKeyedStateHandle	Common interface to all incremental KeyedStateHandle.
IncrementalKeyedStateHandle.HandleAndLocalPath	A Holder of StreamStateHandle and the corresponding localPath.
IncrementalRemoteKeyedStateHandle	The handle to states of an incremental snapshot.
InternalKeyContext	This interface is the current context of a keyed state.
InternalPriorityQueue	Interface for collection that gives in order access to elements w.r.t their priority.
Keyed	Interface for objects that have a key attribute.
KeyedStateBackend	A keyed state backend provides methods for managing keyed state.
KeyedStateBackend.KeySelectionListener	Listener is given a callback when KeyedStateBackend.setCurrentKey(K) is called (key context changes).
KeyedStateBackendParametersImpl	Internal POJO implementing StateBackend.KeyedStateBackendParameters
KeyedStateCheckpointOutputStream	Checkpoint output stream that allows to write raw keyed state in a partitioned way, split into key-groups.
KeyedStateFactory	This factory produces concrete internal state objects.
KeyedStateFunction	A function to be applied to all keyed states.
KeyedStateHandle	Base for the handles of the checkpointed states in keyed streams.
KeyExtractorFunction	Function to extract a key from a given object.
KeyGroupedInternalPriorityQueue	This interface exists as (temporary) adapter between the new InternalPriorityQueue and the old way in which timers are written in a snapshot.
KeyGroupPartitioner.ElementReaderFunction	This functional interface defines how one element is read from a DataInputView.
KeyGroupPartitioner.ElementWriterFunction	This functional interface defines how one element is written to a DataOutputView.
KeyGroupPartitioner.KeyGroupElementsConsumer	Functional interface to consume elements from a key group.
KeyGroupPartitioner.PartitioningResult	This represents the result of key-group partitioning.
KeyGroupRange	This class defines a range of key-group indexes.
KeyGroupRangeOffsets	This class combines a key-group range with offsets that correspond to the key-groups in the range.
KeyGroupsList	This interface offers ordered random read access to multiple key group ids.
KeyGroupsStateHandle	A handle to the partitioned stream operator state after it has been checkpointed.
KeyGroupStatePartitionStreamProvider	This class provides access to an input stream that contains state data for one key group and the key group id.
KeyValueStateIterator	Iterator that over all key-value state entries in a KeyedStateBackend.
LocalRecoveryConfig	This class encapsulates the completed configuration for local recovery, i.e. the root directories into which all file-based snapshots can be written and the general mode for the local recover feature.
LocalSnapshotDirectoryProvider	Provides directories for local backup or local recovery.
ManagedInitializationContext	This interface provides a context in which operators can initialize by registering to managed state (i.e. state that is managed by state backends).
ManagedSnapshotContext	This interface provides a context in which operators that use managed state (i.e. state that is managed by state backends) can perform a snapshot.
NonClosingCheckpointOutputStream	Abstract class to implement custom checkpoint output streams which should not be closable for user code.
OperatorStateBackend	Interface that combines both, the user facing OperatorStateStore interface and the system interface Snapshotable.
OperatorStateCheckpointOutputStream	Checkpoint output stream that allows to write raw operator state in a partitioned way.
OperatorStateHandle	Interface of a state handle for operator state.
OperatorStateHandle.Mode	The modes that determine how an OperatorStreamStateHandle is assigned to tasks during restore.
OperatorStateHandle.StateMetaInfo	Meta information about the operator state handle.
OwnedTaskLocalStateStore	This interface represents the administrative interface to TaskLocalStateStore, that only the owner of the object should see.
PartitionableListState	Implementation of operator list state.
PhysicalStateHandleID	Unique ID that allows for physical comparison between state handles.
PriorityComparable	Interface for objects that can be compared by priority.
PriorityComparator	This interface works similar to Comparable and is used to prioritize between two objects.
PriorityQueueSetFactory	Factory for KeyGroupedInternalPriorityQueue instances.
RegisteredBroadcastStateBackendMetaInfo
RegisteredKeyValueStateBackendMetaInfo	Compound meta information for a registered state in a keyed state backend.
RegisteredOperatorStateBackendMetaInfo	Compound meta information for a registered state in an operator state backend.
RegisteredPriorityQueueStateBackendMetaInfo	Meta information about a priority queue state in a backend.
RegisteredStateMetaInfoBase	Base class for all registered state in state backends.
RegisteredStateMetaInfoBase.Key	Wrapper class that can be used to represent the wrapped RegisteredStateMetaInfoBase as key in a Map.
RestoreOperation	Interface for restore operation.
RetrievableStateHandle	Handle to state that can be read back again via RetrievableStateHandle.retrieveState().
SavepointKeyedStateHandle	A KeyedStateHandle that points to a savepoint taken in the unified format.
SavepointResources	Savepoint resources for a KeyedStateBackend.
SharedStateRegistry	This registry manages state that is shared across (incremental) checkpoints, and is responsible for deleting shared state that is no longer used in any valid checkpoint.
SharedStateRegistryFactory	Simple factory to produce SharedStateRegistry objects.
SharedStateRegistryKey	This class represents a key that uniquely identifies (on a logical level) state handles for registration in the SharedStateRegistry.
Snapshotable	Interface for objects that can snapshot its state (state backends currently).
SnapshotDirectory	This class represents a directory that is the target for a state snapshot.
SnapshotExecutionType	Determines how the write-part of a snapshot should be executed.
SnapshotResources	A set of resources produced in the synchronous part of a snapshot required to finish the snapshot.
SnapshotResult	This class contains the combined results from the snapshot of a state backend: A state object representing the state that will be reported to the Job Manager to acknowledge the checkpoint.
SnapshotStrategy	Interface for different snapshot approaches in state backends.
SnapshotStrategy.SnapshotResultSupplier	A supplier for a SnapshotResult with an access to a CloseableRegistry for io tasks that need to be closed when cancelling the async part of the checkpoint.
SnapshotStrategyRunner	A class to execute a SnapshotStrategy.
StateBackend	A State Backend defines how the state of a streaming application is stored locally within the cluster.
StateBackend.CustomInitializationMetrics
StateBackend.KeyedStateBackendParameters	Parameters passed to StateBackend.createKeyedStateBackend(KeyedStateBackendParameters).
StateBackend.OperatorStateBackendParameters	Parameters passed to StateBackend.createOperatorStateBackend(OperatorStateBackendParameters).
StateBackendBuilder	A mutable builder to build a state backend instance.
StateEntry	Interface of entries in a state backend.
StateHandleID	Unique ID that allows for logical comparison between state handles.
StateInitializationContext	This interface provides a context in which operators can initialize by registering to managed state (i.e. state that is managed by state backends) or iterating over streams of state partitions written as raw state in a previous snapshot.
StateObject	Base of all handles that represent checkpointed state in some form.
StateObject.StateObjectLocation	Enum for state locations.
StateObject.StateObjectSizeStatsCollector	Collector for size and location stats from a state object via StateObject.collectSizeStats(StateObjectSizeStatsCollector).
StatePartitionStreamProvider	This class provides access to input streams that contain data of one state partition of a partitionable state.
StateSerializerProvider	A StateSerializerProvider wraps logic on how to obtain serializers for registered state, either with the previous schema of state in checkpoints or the current schema of state.
StateSnapshot	General interface for state snapshots that should be written partitioned by key-groups.
StateSnapshot.StateKeyGroupWriter	Interface for writing a snapshot that is partitioned into key-groups.
StateSnapshotContext	This interface provides a context in which operators that use managed (i.e. state that is managed by state backends) or raw (i.e. the operator can write it's state streams) state can perform a snapshot.
StateSnapshotKeyGroupReader	Interface for state de-serialization into StateTables by key-group.
StateSnapshotTransformer	Transformer of state values which are included or skipped in the snapshot.
StateSnapshotTransformer.CollectionStateSnapshotTransformer.TransformStrategy
StateSnapshotTransformer.StateSnapshotTransformFactory	This factory creates state transformers depending on the form of values to transform.
StateSnapshotTransformers.StateSnapshotTransformFactoryWrapAdaptor
StreamCompressionDecorator	Implementations of this interface decorate streams with a compression scheme.
StreamStateHandle	A StateObject that represents state that was written to a stream.
TaskExecutorStateChangelogStoragesManager	This class holds the all StateChangelogStorage objects for a task executor (manager).
TaskLocalStateStore	Classes that implement this interface serve as a task-manager-level local storage for local checkpointed state.
TaskLocalStateStoreImpl	Main implementation of a TaskLocalStateStore.
TaskStateManager	This interface provides methods to report and retrieve state for a task.
TestableKeyedStateBackend	A keyed state backend interface for internal testing purpose.
VoidNamespace	Singleton placeholder class for state without a namespace.
VoidNamespaceSerializer	Serializer for VoidNamespace.
VoidNamespaceTypeInfo	TypeInformation for VoidNamespace.

Classes in org.apache.flink.runtime.state used by org.apache.flink.runtime.state.changelog

Class	Description
CheckpointBoundKeyedStateHandle	KeyedStateHandle that is bound to a specific checkpoint.
CompositeStateHandle	Base of all snapshots that are taken by StateBackends and some other components in tasks.
KeyedStateHandle	Base for the handles of the checkpointed states in keyed streams.
KeyGroupRange	This class defines a range of key-group indexes.
LocalRecoveryConfig	This class encapsulates the completed configuration for local recovery, i.e. the root directories into which all file-based snapshots can be written and the general mode for the local recover feature.
SharedStateRegistry	This registry manages state that is shared across (incremental) checkpoints, and is responsible for deleting shared state that is no longer used in any valid checkpoint.
SnapshotResult	This class contains the combined results from the snapshot of a state backend: A state object representing the state that will be reported to the Job Manager to acknowledge the checkpoint.
StateHandleID	Unique ID that allows for logical comparison between state handles.
StateObject	Base of all handles that represent checkpointed state in some form.
StreamStateHandle	A StateObject that represents state that was written to a stream.

Classes in org.apache.flink.runtime.state used by org.apache.flink.runtime.state.changelog.inmemory

Class	Description
CompositeStateHandle	Base of all snapshots that are taken by StateBackends and some other components in tasks.
KeyedStateHandle	Base for the handles of the checkpointed states in keyed streams.
KeyGroupRange	This class defines a range of key-group indexes.
LocalRecoveryConfig	This class encapsulates the completed configuration for local recovery, i.e. the root directories into which all file-based snapshots can be written and the general mode for the local recover feature.
SharedStateRegistry	This registry manages state that is shared across (incremental) checkpoints, and is responsible for deleting shared state that is no longer used in any valid checkpoint.
StateHandleID	Unique ID that allows for logical comparison between state handles.
StateObject	Base of all handles that represent checkpointed state in some form.
StateObject.StateObjectSizeStatsCollector	Collector for size and location stats from a state object via StateObject.collectSizeStats(StateObjectSizeStatsCollector).

Classes in org.apache.flink.runtime.state used by org.apache.flink.runtime.state.delegate

Class	Description
StateBackend	A State Backend defines how the state of a streaming application is stored locally within the cluster.

Classes in org.apache.flink.runtime.state used by org.apache.flink.runtime.state.filemerging

Class	Description
CheckpointedStateScope	The scope for a chunk of checkpointed state.
CompositeStateHandle	Base of all snapshots that are taken by StateBackends and some other components in tasks.
OperatorStateHandle	Interface of a state handle for operator state.
OperatorStateHandle.StateMetaInfo	Meta information about the operator state handle.
OperatorStreamStateHandle	State handle for partitionable operator state.
PhysicalStateHandleID	Unique ID that allows for physical comparison between state handles.
SharedStateRegistry	This registry manages state that is shared across (incremental) checkpoints, and is responsible for deleting shared state that is no longer used in any valid checkpoint.
SharedStateRegistryKey	This class represents a key that uniquely identifies (on a logical level) state handles for registration in the SharedStateRegistry.
StateObject	Base of all handles that represent checkpointed state in some form.
StateObject.StateObjectSizeStatsCollector	Collector for size and location stats from a state object via StateObject.collectSizeStats(StateObjectSizeStatsCollector).
StreamStateHandle	A StateObject that represents state that was written to a stream.

Classes in org.apache.flink.runtime.state used by org.apache.flink.runtime.state.filesystem

Class	Description
AbstractStateBackend	An abstract base implementation of the StateBackend interface.
CheckpointedStateScope	The scope for a chunk of checkpointed state.
CheckpointMetadataOutputStream	An output stream for checkpoint metadata.
CheckpointStateOutputStream	A dedicated output stream that produces a StreamStateHandle when closed.
CheckpointStateToolset	A toolset of operations that can be performed on a location embedded within the class.
CheckpointStorage	CheckpointStorage defines how StateBackend's store their state for fault tolerance in streaming applications.
CheckpointStorageAccess	Implementations of this interface should implement methods acting as an administration role for checkpoint storage, which defined in CheckpointStorageCoordinatorView.
CheckpointStorageCoordinatorView	This interface creates a CheckpointStorageLocation to which an individual checkpoint or savepoint is stored.
CheckpointStorageLocation	A storage location for one particular checkpoint, offering data persistent, metadata persistence, and lifecycle/cleanup methods.
CheckpointStorageLocationReference	A reference to a storage location.
CheckpointStorageWorkerView	This interface implements the durable storage of checkpoint data and metadata streams.
CheckpointStreamFactory	A factory for checkpoint output streams, which are used to persist data for checkpoints.
CompletedCheckpointStorageLocation	The CompletedCheckpointStorageLocation describes the storage aspect of a completed checkpoint.
PhysicalStateHandleID	Unique ID that allows for physical comparison between state handles.
StateBackend	A State Backend defines how the state of a streaming application is stored locally within the cluster.
StateObject	Base of all handles that represent checkpointed state in some form.
StateObject.StateObjectSizeStatsCollector	Collector for size and location stats from a state object via StateObject.collectSizeStats(StateObjectSizeStatsCollector).
StreamStateHandle	A StateObject that represents state that was written to a stream.

Classes in org.apache.flink.runtime.state used by org.apache.flink.runtime.state.hashmap

Class	Description
AbstractKeyedStateBackend	Base implementation of KeyedStateBackend.
AbstractStateBackend	An abstract base implementation of the StateBackend interface.
BackendBuildingException	Exceptions which indicate that a state backend building has failed.
ConfigurableStateBackend	An interface for state backends that pick up additional parameters from a configuration.
OperatorStateBackend	Interface that combines both, the user facing OperatorStateStore interface and the system interface Snapshotable.
StateBackend	A State Backend defines how the state of a streaming application is stored locally within the cluster.
StateBackend.KeyedStateBackendParameters	Parameters passed to StateBackend.createKeyedStateBackend(KeyedStateBackendParameters).
StateBackend.OperatorStateBackendParameters	Parameters passed to StateBackend.createOperatorStateBackend(OperatorStateBackendParameters).
StateBackendFactory	A factory to create a specific state backend.

Classes in org.apache.flink.runtime.state used by org.apache.flink.runtime.state.heap

Class	Description
AbstractKeyedStateBackend	Base implementation of KeyedStateBackend.
AbstractKeyedStateBackend.PartitionStateFactory
AbstractKeyedStateBackendBuilder	An abstract base implementation of the StateBackendBuilder interface.
BackendBuildingException	Exceptions which indicate that a state backend building has failed.
CheckpointableKeyedStateBackend	Interface that combines both, the KeyedStateBackend interface, which encapsulates methods responsible for keyed state management and the Snapshotable which tells the system how to snapshot the underlying state.
CheckpointStreamFactory	A factory for checkpoint output streams, which are used to persist data for checkpoints.
InternalKeyContext	This interface is the current context of a keyed state.
InternalPriorityQueue	Interface for collection that gives in order access to elements w.r.t their priority.
IterableStateSnapshot	A StateSnapshot that can return an iterator over all contained StateEntries.
Keyed	Interface for objects that have a key attribute.
KeyedStateBackend	A keyed state backend provides methods for managing keyed state.
KeyedStateFactory	This factory produces concrete internal state objects.
KeyedStateFunction	A function to be applied to all keyed states.
KeyedStateHandle	Base for the handles of the checkpointed states in keyed streams.
KeyExtractorFunction	Function to extract a key from a given object.
KeyGroupedInternalPriorityQueue	This interface exists as (temporary) adapter between the new InternalPriorityQueue and the old way in which timers are written in a snapshot.
KeyGroupRange	This class defines a range of key-group indexes.
KeyValueStateIterator	Iterator that over all key-value state entries in a KeyedStateBackend.
LocalRecoveryConfig	This class encapsulates the completed configuration for local recovery, i.e. the root directories into which all file-based snapshots can be written and the general mode for the local recover feature.
PriorityComparable	Interface for objects that can be compared by priority.
PriorityComparator	This interface works similar to Comparable and is used to prioritize between two objects.
PriorityQueueSetFactory	Factory for KeyGroupedInternalPriorityQueue instances.
RegisteredKeyValueStateBackendMetaInfo	Compound meta information for a registered state in a keyed state backend.
RegisteredPriorityQueueStateBackendMetaInfo	Meta information about a priority queue state in a backend.
RestoreOperation	Interface for restore operation.
SavepointResources	Savepoint resources for a KeyedStateBackend.
Snapshotable	Interface for objects that can snapshot its state (state backends currently).
SnapshotExecutionType	Determines how the write-part of a snapshot should be executed.
SnapshotResult	This class contains the combined results from the snapshot of a state backend: A state object representing the state that will be reported to the Job Manager to acknowledge the checkpoint.
StateBackendBuilder	A mutable builder to build a state backend instance.
StateEntry	Interface of entries in a state backend.
StateSnapshot	General interface for state snapshots that should be written partitioned by key-groups.
StateSnapshot.StateKeyGroupWriter	Interface for writing a snapshot that is partitioned into key-groups.
StateSnapshotKeyGroupReader	Interface for state de-serialization into StateTables by key-group.
StateSnapshotRestore	Interface to deal with state snapshot and restore of state.
StateSnapshotTransformer	Transformer of state values which are included or skipped in the snapshot.
StateSnapshotTransformer.StateSnapshotTransformFactory	This factory creates state transformers depending on the form of values to transform.
StateTransformationFunction	Interface for a binary function that is used for push-down of state transformation into state backends.
StreamCompressionDecorator	Implementations of this interface decorate streams with a compression scheme.
TestableKeyedStateBackend	A keyed state backend interface for internal testing purpose.

Classes in org.apache.flink.runtime.state used by org.apache.flink.runtime.state.internal

Class	Description
StateEntry	Interface of entries in a state backend.

Classes in org.apache.flink.runtime.state used by org.apache.flink.runtime.state.memory

Class	Description
CheckpointedStateScope	The scope for a chunk of checkpointed state.
CheckpointMetadataOutputStream	An output stream for checkpoint metadata.
CheckpointStateOutputStream	A dedicated output stream that produces a StreamStateHandle when closed.
CheckpointStateToolset	A toolset of operations that can be performed on a location embedded within the class.
CheckpointStorageAccess	Implementations of this interface should implement methods acting as an administration role for checkpoint storage, which defined in CheckpointStorageCoordinatorView.
CheckpointStorageCoordinatorView	This interface creates a CheckpointStorageLocation to which an individual checkpoint or savepoint is stored.
CheckpointStorageLocation	A storage location for one particular checkpoint, offering data persistent, metadata persistence, and lifecycle/cleanup methods.
CheckpointStorageLocationReference	A reference to a storage location.
CheckpointStorageWorkerView	This interface implements the durable storage of checkpoint data and metadata streams.
CheckpointStreamFactory	A factory for checkpoint output streams, which are used to persist data for checkpoints.
PhysicalStateHandleID	Unique ID that allows for physical comparison between state handles.
StateObject	Base of all handles that represent checkpointed state in some form.
StateObject.StateObjectSizeStatsCollector	Collector for size and location stats from a state object via StateObject.collectSizeStats(StateObjectSizeStatsCollector).
StreamStateHandle	A StateObject that represents state that was written to a stream.

Classes in org.apache.flink.runtime.state used by org.apache.flink.runtime.state.restore

Class	Description
KeyedStateHandle	Base for the handles of the checkpointed states in keyed streams.
KeyGroupRange	This class defines a range of key-group indexes.
RestoreOperation	Interface for restore operation.
StateSerializerProvider	A StateSerializerProvider wraps logic on how to obtain serializers for registered state, either with the previous schema of state in checkpoints or the current schema of state.

Classes in org.apache.flink.runtime.state used by org.apache.flink.runtime.state.storage

Class	Description
CheckpointStorage	CheckpointStorage defines how StateBackend's store their state for fault tolerance in streaming applications.
CheckpointStorageAccess	Implementations of this interface should implement methods acting as an administration role for checkpoint storage, which defined in CheckpointStorageCoordinatorView.
CompletedCheckpointStorageLocation	The CompletedCheckpointStorageLocation describes the storage aspect of a completed checkpoint.
ConfigurableCheckpointStorage	An interface for checkpoint storage types that pick up additional parameters from a configuration.

Classes in org.apache.flink.runtime.state used by org.apache.flink.runtime.state.ttl

Class	Description
KeyedStateBackend	A keyed state backend provides methods for managing keyed state.

Classes in org.apache.flink.runtime.state used by org.apache.flink.runtime.state.v2

Class	Description
RegisteredStateMetaInfoBase	Base class for all registered state in state backends.
StateSnapshotTransformer.StateSnapshotTransformFactory	This factory creates state transformers depending on the form of values to transform.

Classes in org.apache.flink.runtime.state used by org.apache.flink.runtime.state.v2.adaptor

Class	Description
AsyncKeyedStateBackend	An async keyed state backend provides methods supporting to access keyed state asynchronously and in batch.
CheckpointableKeyedStateBackend	Interface that combines both, the KeyedStateBackend interface, which encapsulates methods responsible for keyed state management and the Snapshotable which tells the system how to snapshot the underlying state.
CheckpointStreamFactory	A factory for checkpoint output streams, which are used to persist data for checkpoints.
Keyed	Interface for objects that have a key attribute.
KeyedStateHandle	Base for the handles of the checkpointed states in keyed streams.
KeyGroupedInternalPriorityQueue	This interface exists as (temporary) adapter between the new InternalPriorityQueue and the old way in which timers are written in a snapshot.
KeyGroupRange	This class defines a range of key-group indexes.
PriorityComparable	Interface for objects that can be compared by priority.
PriorityQueueSetFactory	Factory for KeyGroupedInternalPriorityQueue instances.
Snapshotable	Interface for objects that can snapshot its state (state backends currently).
SnapshotResult	This class contains the combined results from the snapshot of a state backend: A state object representing the state that will be reported to the Job Manager to acknowledge the checkpoint.

Classes in org.apache.flink.runtime.state used by org.apache.flink.runtime.state.v2.ttl

Class	Description
AsyncKeyedStateBackend	An async keyed state backend provides methods supporting to access keyed state asynchronously and in batch.

Classes in org.apache.flink.runtime.state used by org.apache.flink.runtime.taskexecutor

Class	Description
TaskExecutorChannelStateExecutorFactoryManager	This class holds the all ChannelStateWriteRequestExecutorFactory objects for a task executor (manager).
TaskExecutorFileMergingManager	There is one FileMergingSnapshotManager for each job per task manager.
TaskExecutorLocalStateStoresManager	This class holds the all TaskLocalStateStoreImpl objects for a task executor (manager).
TaskExecutorStateChangelogStoragesManager	This class holds the all StateChangelogStorage objects for a task executor (manager).

Classes in org.apache.flink.runtime.state used by org.apache.flink.runtime.taskexecutor.rpc

Class	Description
KeyGroupRange	This class defines a range of key-group indexes.

Classes in org.apache.flink.runtime.state used by org.apache.flink.runtime.taskmanager

Class	Description
CheckpointStorageAccess	Implementations of this interface should implement methods acting as an administration role for checkpoint storage, which defined in CheckpointStorageCoordinatorView.
TaskStateManager	This interface provides methods to report and retrieve state for a task.

Classes in org.apache.flink.runtime.state used by org.apache.flink.runtime.util

Class	Description
SharedStateRegistryFactory	Simple factory to produce SharedStateRegistry objects.
StateObject	Base of all handles that represent checkpointed state in some form.

Classes in org.apache.flink.runtime.state used by org.apache.flink.runtime.zookeeper

Class	Description
RetrievableStateHandle	Handle to state that can be read back again via RetrievableStateHandle.retrieveState().

Classes in org.apache.flink.runtime.state used by org.apache.flink.streaming.api

Class	Description
VoidNamespace	Singleton placeholder class for state without a namespace.

Classes in org.apache.flink.runtime.state used by org.apache.flink.streaming.api.checkpoint

Class	Description
FunctionInitializationContext	This interface provides a context in which user functions can initialize by registering to managed state (i.e. state that is managed by state backends).
FunctionSnapshotContext	This interface provides a context in which user functions that use managed state (i.e. state that is managed by state backends) can participate in a snapshot.

Classes in org.apache.flink.runtime.state used by org.apache.flink.streaming.api.functions.co

Class	Description
KeyedStateFunction	A function to be applied to all keyed states.

Classes in org.apache.flink.runtime.state used by org.apache.flink.streaming.api.functions.source

Class	Description
StateInitializationContext	This interface provides a context in which operators can initialize by registering to managed state (i.e. state that is managed by state backends) or iterating over streams of state partitions written as raw state in a previous snapshot.
StateSnapshotContext	This interface provides a context in which operators that use managed (i.e. state that is managed by state backends) or raw (i.e. the operator can write it's state streams) state can perform a snapshot.

Classes in org.apache.flink.runtime.state used by org.apache.flink.streaming.api.functions.source.legacy

Class	Description
FunctionInitializationContext	This interface provides a context in which user functions can initialize by registering to managed state (i.e. state that is managed by state backends).
FunctionSnapshotContext	This interface provides a context in which user functions that use managed state (i.e. state that is managed by state backends) can participate in a snapshot.

Classes in org.apache.flink.runtime.state used by org.apache.flink.streaming.api.graph

Class	Description
CheckpointStorage	CheckpointStorage defines how StateBackend's store their state for fault tolerance in streaming applications.
StateBackend	A State Backend defines how the state of a streaming application is stored locally within the cluster.

Classes in org.apache.flink.runtime.state used by org.apache.flink.streaming.api.operators

Class	Description
AsyncKeyedStateBackend	An async keyed state backend provides methods supporting to access keyed state asynchronously and in batch.
CheckpointableKeyedStateBackend	Interface that combines both, the KeyedStateBackend interface, which encapsulates methods responsible for keyed state management and the Snapshotable which tells the system how to snapshot the underlying state.
CheckpointStreamFactory	A factory for checkpoint output streams, which are used to persist data for checkpoints.
FullSnapshotResources	A SnapshotResources to be used with the backend-independent FullSnapshotAsyncWriter.
InputChannelStateHandle	Handle to an InputChannel state.
Keyed	Interface for objects that have a key attribute.
KeyedStateBackend	A keyed state backend provides methods for managing keyed state.
KeyedStateCheckpointOutputStream	Checkpoint output stream that allows to write raw keyed state in a partitioned way, split into key-groups.
KeyedStateHandle	Base for the handles of the checkpointed states in keyed streams.
KeyExtractorFunction	Function to extract a key from a given object.
KeyGroupedInternalPriorityQueue	This interface exists as (temporary) adapter between the new InternalPriorityQueue and the old way in which timers are written in a snapshot.
KeyGroupRange	This class defines a range of key-group indexes.
KeyGroupStatePartitionStreamProvider	This class provides access to an input stream that contains state data for one key group and the key group id.
OperatorStateBackend	Interface that combines both, the user facing OperatorStateStore interface and the system interface Snapshotable.
OperatorStateHandle	Interface of a state handle for operator state.
PriorityComparable	Interface for objects that can be compared by priority.
PriorityComparator	This interface works similar to Comparable and is used to prioritize between two objects.
PriorityQueueSetFactory	Factory for KeyGroupedInternalPriorityQueue instances.
ResultSubpartitionStateHandle	Handle to a ResultSubpartition state.
SnapshotResult	This class contains the combined results from the snapshot of a state backend: A state object representing the state that will be reported to the Job Manager to acknowledge the checkpoint.
SnapshotStrategyRunner	A class to execute a SnapshotStrategy.
StateBackend	A State Backend defines how the state of a streaming application is stored locally within the cluster.
StateBackend.KeyedStateBackendParameters	Parameters passed to StateBackend.createKeyedStateBackend(KeyedStateBackendParameters).
StateInitializationContext	This interface provides a context in which operators can initialize by registering to managed state (i.e. state that is managed by state backends) or iterating over streams of state partitions written as raw state in a previous snapshot.
StateObject	Base of all handles that represent checkpointed state in some form.
StateObject.StateObjectSizeStatsCollector	Collector for size and location stats from a state object via StateObject.collectSizeStats(StateObjectSizeStatsCollector).
StatePartitionStreamProvider	This class provides access to input streams that contain data of one state partition of a partitionable state.
StateSnapshotContext	This interface provides a context in which operators that use managed (i.e. state that is managed by state backends) or raw (i.e. the operator can write it's state streams) state can perform a snapshot.
VoidNamespace	Singleton placeholder class for state without a namespace.

Classes in org.apache.flink.runtime.state used by org.apache.flink.streaming.api.operators.co

Class	Description
StateInitializationContext	This interface provides a context in which operators can initialize by registering to managed state (i.e. state that is managed by state backends) or iterating over streams of state partitions written as raw state in a previous snapshot.
VoidNamespace	Singleton placeholder class for state without a namespace.

Classes in org.apache.flink.runtime.state used by org.apache.flink.streaming.api.operators.collect

Class	Description
FunctionInitializationContext	This interface provides a context in which user functions can initialize by registering to managed state (i.e. state that is managed by state backends).
FunctionSnapshotContext	This interface provides a context in which user functions that use managed state (i.e. state that is managed by state backends) can participate in a snapshot.

Classes in org.apache.flink.runtime.state used by org.apache.flink.streaming.api.operators.sorted.state

Class	Description
CheckpointableKeyedStateBackend	Interface that combines both, the KeyedStateBackend interface, which encapsulates methods responsible for keyed state management and the Snapshotable which tells the system how to snapshot the underlying state.
CheckpointStorage	CheckpointStorage defines how StateBackend's store their state for fault tolerance in streaming applications.
CheckpointStorageAccess	Implementations of this interface should implement methods acting as an administration role for checkpoint storage, which defined in CheckpointStorageCoordinatorView.
CheckpointStreamFactory	A factory for checkpoint output streams, which are used to persist data for checkpoints.
CompletedCheckpointStorageLocation	The CompletedCheckpointStorageLocation describes the storage aspect of a completed checkpoint.
Keyed	Interface for objects that have a key attribute.
KeyedStateBackend	A keyed state backend provides methods for managing keyed state.
KeyedStateBackend.KeySelectionListener	Listener is given a callback when KeyedStateBackend.setCurrentKey(K) is called (key context changes).
KeyedStateCheckpointOutputStream	Checkpoint output stream that allows to write raw keyed state in a partitioned way, split into key-groups.
KeyedStateFactory	This factory produces concrete internal state objects.
KeyedStateFunction	A function to be applied to all keyed states.
KeyedStateHandle	Base for the handles of the checkpointed states in keyed streams.
KeyGroupedInternalPriorityQueue	This interface exists as (temporary) adapter between the new InternalPriorityQueue and the old way in which timers are written in a snapshot.
KeyGroupRange	This class defines a range of key-group indexes.
KeyGroupStatePartitionStreamProvider	This class provides access to an input stream that contains state data for one key group and the key group id.
OperatorStateBackend	Interface that combines both, the user facing OperatorStateStore interface and the system interface Snapshotable.
PriorityComparable	Interface for objects that can be compared by priority.
PriorityQueueSetFactory	Factory for KeyGroupedInternalPriorityQueue instances.
SavepointResources	Savepoint resources for a KeyedStateBackend.
Snapshotable	Interface for objects that can snapshot its state (state backends currently).
SnapshotResult	This class contains the combined results from the snapshot of a state backend: A state object representing the state that will be reported to the Job Manager to acknowledge the checkpoint.
StateBackend	A State Backend defines how the state of a streaming application is stored locally within the cluster.
StateBackend.KeyedStateBackendParameters	Parameters passed to StateBackend.createKeyedStateBackend(KeyedStateBackendParameters).
StateBackend.OperatorStateBackendParameters	Parameters passed to StateBackend.createOperatorStateBackend(OperatorStateBackendParameters).
StateSnapshotTransformer.StateSnapshotTransformFactory	This factory creates state transformers depending on the form of values to transform.

Classes in org.apache.flink.runtime.state used by org.apache.flink.streaming.runtime.operators.sink

Class	Description
StateInitializationContext	This interface provides a context in which operators can initialize by registering to managed state (i.e. state that is managed by state backends) or iterating over streams of state partitions written as raw state in a previous snapshot.
StateSnapshotContext	This interface provides a context in which operators that use managed (i.e. state that is managed by state backends) or raw (i.e. the operator can write it's state streams) state can perform a snapshot.

Classes in org.apache.flink.runtime.state used by org.apache.flink.streaming.runtime.operators.windowing

Class	Description
DefaultKeyedStateStore	Default implementation of KeyedStateStore that currently forwards state registration to a RuntimeContext.
KeyedStateBackend	A keyed state backend provides methods for managing keyed state.

Classes in org.apache.flink.runtime.state used by org.apache.flink.streaming.runtime.tasks

Class	Description
CheckpointStorage	CheckpointStorage defines how StateBackend's store their state for fault tolerance in streaming applications.
CheckpointStorageWorkerView	This interface implements the durable storage of checkpoint data and metadata streams.
CheckpointStreamFactory	A factory for checkpoint output streams, which are used to persist data for checkpoints.
StateBackend	A State Backend defines how the state of a streaming application is stored locally within the cluster.

Classes in org.apache.flink.runtime.state used by org.apache.flink.streaming.util.functions

Class	Description
OperatorStateBackend	Interface that combines both, the user facing OperatorStateStore interface and the system interface Snapshotable.
StateInitializationContext	This interface provides a context in which operators can initialize by registering to managed state (i.e. state that is managed by state backends) or iterating over streams of state partitions written as raw state in a previous snapshot.
StateSnapshotContext	This interface provides a context in which operators that use managed (i.e. state that is managed by state backends) or raw (i.e. the operator can write it's state streams) state can perform a snapshot.