Github user aljoscha commented on a diff in the pull request:
https://github.com/apache/flink/pull/3336#discussion_r102426841
--- Diff: docs/dev/stream/state.md ---
@@ -118,6 +118,11 @@ added to the state. Contrary to `ReducingState`, the
aggregate type may be diffe
of elements that are added to the state. The interface is the same as for
`ListState` but elements
added using `add(T)` are folded into an aggregate using a specified
`FoldFunction`.
+* `MapState<UK, UV>`: This keeps a list of mappings. You can put key-value
pairs into the state and retrieve
+retrieve an `Iterable` over all currently stored mappings. Mappings are
added using `put(UK, UV)` or
--- End diff --
duplicate "retrieve"
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