Github user aljoscha commented on the issue:
https://github.com/apache/flink/pull/3508
I would like us to take some time and think about the name. We are about to
introduce a thing called "broadcast state" somewhat soon in the effort to make
streaming joins possible. This broadcast state will provide an interface very
similar to the current keyed state (we'll probably reuse the descriptors and
state interfaces) but be checkpointed only on one operator because we only
allow modifications based on broadcast input.
I propose to rename the state we're talking about here to `UnionState` (or
something) similar because what it does is take the snapshotted state from all
operators and when restoring sends the union of that to all operators.
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