org.apache.flink.runtime.state.filesystem

Class FsFoldingState<K,N,T,ACC>

java.lang.Object

org.apache.flink.runtime.state.AbstractHeapState<K,N,SV,S,SD,FsStateBackend>

org.apache.flink.runtime.state.filesystem.AbstractFsState<K,N,ACC,FoldingState<T,ACC>,FoldingStateDescriptor<T,ACC>>

org.apache.flink.runtime.state.filesystem.FsFoldingState<K,N,T,ACC>

Type Parameters:

K - The type of the key.

N - The type of the namespace.

T - The type of the values that can be folded into the state.

ACC - The type of the value in the folding state.

All Implemented Interfaces:

FoldingState<T,ACC>, MergingState<T,ACC>, State, KvState<K,N,FoldingState<T,ACC>,FoldingStateDescriptor<T,ACC>,FsStateBackend>

public class FsFoldingState<K,N,T,ACC>
extends AbstractFsState<K,N,ACC,FoldingState<T,ACC>,FoldingStateDescriptor<T,ACC>>
implements FoldingState<T,ACC>

Heap-backed partitioned FoldingState that is snapshotted into files.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	FsFoldingState.Snapshot<K,N,T,ACC>

Field Summary

Fields inherited from class org.apache.flink.runtime.state.AbstractHeapState

currentKey, currentNamespace, currentNSState, keySerializer, namespaceSerializer, state, stateDesc, stateSerializer

Constructor Summary

Constructors

Constructor and Description
FsFoldingState(FsStateBackend backend, TypeSerializer<K> keySerializer, TypeSerializer<N> namespaceSerializer, FoldingStateDescriptor<T,ACC> stateDesc) Creates a new and empty partitioned state.
FsFoldingState(FsStateBackend backend, TypeSerializer<K> keySerializer, TypeSerializer<N> namespaceSerializer, FoldingStateDescriptor<T,ACC> stateDesc, HashMap<N,Map<K,ACC>> state) Creates a new key/value state with the given state contents.

Method Summary

Methods

Modifier and Type	Method and Description
void	add(T value)
KvStateSnapshot<K,N,FoldingState<T,ACC>,FoldingStateDescriptor<T,ACC>,FsStateBackend>	createHeapSnapshot(Path filePath)
ACC	get()

Methods inherited from class org.apache.flink.runtime.state.filesystem.AbstractFsState

snapshot

Methods inherited from class org.apache.flink.runtime.state.AbstractHeapState

clear, dispose, getKeySerializer, getNamespaceSerializer, setCurrentKey, setCurrentNamespace, size

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.flink.api.common.state.State

clear

Constructor Detail

FsFoldingState

public FsFoldingState(FsStateBackend backend,
              TypeSerializer<K> keySerializer,
              TypeSerializer<N> namespaceSerializer,
              FoldingStateDescriptor<T,ACC> stateDesc)

Creates a new and empty partitioned state.

Parameters:

backend - The file system state backend backing snapshots of this state

keySerializer - The serializer for the key.

namespaceSerializer - The serializer for the namespace.

stateDesc - The state identifier for the state. This contains name and can create a default state value.

FsFoldingState

public FsFoldingState(FsStateBackend backend,
              TypeSerializer<K> keySerializer,
              TypeSerializer<N> namespaceSerializer,
              FoldingStateDescriptor<T,ACC> stateDesc,
              HashMap<N,Map<K,ACC>> state)

Creates a new key/value state with the given state contents. This method is used to re-create key/value state with existing data, for example from a snapshot.

Parameters:

backend - The file system state backend backing snapshots of this state

keySerializer - The serializer for the key.

namespaceSerializer - The serializer for the namespace.

stateDesc - The state identifier for the state. This contains name and can create a default state value.

state - The map of key/value pairs to initialize the state with.

Method Detail

get

public ACC get()

Specified by:

get in interface MergingState<T,ACC>

add

public void add(T value)
         throws IOException

Specified by:

add in interface MergingState<T,ACC>

Throws:

IOException

createHeapSnapshot

public KvStateSnapshot<K,N,FoldingState<T,ACC>,FoldingStateDescriptor<T,ACC>,FsStateBackend> createHeapSnapshot(Path filePath)

Specified by:

createHeapSnapshot in class AbstractFsState<K,N,ACC,FoldingState<T,ACC>,FoldingStateDescriptor<T,ACC>>