Package org.apache.flink.runtime.state.internal

Interface InternalMergingState<K,N,IN,SV,OUT>

Type Parameters:
K - The type of key the state is associated to
N - The type of the namespace
IN - The type of elements added to the state
SV - The type of elements in the state
OUT - The type of elements
All Superinterfaces:
org.apache.flink.api.common.state.AppendingState<IN,OUT>, InternalAppendingState<K,N,IN,SV,OUT>, InternalKvState<K,N,SV>, org.apache.flink.api.common.state.MergingState<IN,OUT>, org.apache.flink.api.common.state.State
All Known Subinterfaces:
InternalAggregatingState<K,N,IN,SV,OUT>, InternalListState<K,N,T>, InternalReducingState<K,N,T>
public interface InternalMergingState<K,N,IN,SV,OUT> extends InternalAppendingState<K,N,IN,SV,OUT>, org.apache.flink.api.common.state.MergingState<IN,OUT>
The peer to the MergingState in the internal state type hierarchy.

See InternalKvState for a description of the internal state hierarchy.

  • Method Details

    • mergeNamespaces

      void mergeNamespaces(N target, Collection<N> sources) throws Exception
      Merges the state of the current key for the given source namespaces into the state of the target namespace.
      Parameters:
      target - The target namespace where the merged state should be stored.
      sources - The source namespaces whose state should be merged.
      Throws:
      Exception - The method may forward exception thrown internally (by I/O or functions).