Github user StephanEwen commented on a diff in the pull request:
https://github.com/apache/flink/pull/1605#discussion_r52599200
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/state/AbstractStateBackend.java
---
@@ -148,6 +150,18 @@ public void dispose() {
abstract protected <N, T> ReducingState<T>
createReducingState(TypeSerializer<N> namespaceSerializer,
ReducingStateDescriptor<T> stateDesc) throws Exception;
/**
+ * Creates and returns a new {@link FoldingState}.
+ *
+ * @param namespaceSerializer TypeSerializer for the state namespace.
+ * @param stateDesc The {@code StateDescriptor} that contains the name
of the state.
+ *
+ * @param <N> The type of the namespace.
+ * @param <T> Type of the values folded into the state
+ * @param <ACC> Type of the value in the state *
+ */
+ abstract protected <N, T, ACC> FoldingState<T, ACC>
createFoldingState(TypeSerializer<N> namespaceSerializer,
FoldingStateDescriptor<T, ACC> stateDesc) throws Exception;
--- End diff --
protected abstract
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