org.apache.flink.api.common.state

Interface State

All Known Subinterfaces:

AggregatingState<IN,OUT>, AppendingState<IN,OUT>, BackendWritableBroadcastState<K,V>, BroadcastState<K,V>, FoldingState<T,ACC>, InternalAggregatingState<K,N,IN,SV,OUT>, InternalAppendingState<K,N,IN,SV,OUT>, InternalFoldingState<K,N,T,ACC>, InternalKvState<K,N,V>, InternalListState<K,N,T>, InternalMapState<K,N,UK,UV>, InternalMergingState<K,N,IN,SV,OUT>, InternalReducingState<K,N,T>, InternalValueState<K,N,T>, ListState<T>, MapState<UK,UV>, MergingState<IN,OUT>, ReadOnlyBroadcastState<K,V>, ReducingState<T>, ValueState<T>

All Known Implementing Classes:

AbstractHeapState, AbstractRocksDBState, HeapBroadcastState, ImmutableAggregatingState, ImmutableFoldingState, ImmutableListState, ImmutableMapState, ImmutableReducingState, ImmutableValueState, PartitionableListState

@PublicEvolving
public interface State

Interface that different types of partitioned state must implement.

The state is only accessible by functions applied on a KeyedStream. The key is automatically supplied by the system, so the function always sees the value mapped to the key of the current element. That way, the system can handle stream and state partitioning consistently together.

Method Summary

Modifier and Type	Method and Description
void	clear() Removes the value mapped under the current key.

Method Detail

clear

void clear()

Removes the value mapped under the current key.