Github user tillrohrmann commented on the pull request:
https://github.com/apache/flink/pull/1988#issuecomment-220289629
In order to support scaling for non-partitioned state, the next step could
be the introduction of a kind of union state. The idea would be to aggregate
the non-partitioned state of each subtask and then sending it to all subtasks
upon recovery. Then every subtask can pick from the union state what it needs
for its execution
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