Github user aljoscha commented on the pull request:
https://github.com/apache/flink/pull/643#issuecomment-98690440
I'm afraid we need to be a bit more strict here. We need to partition the
state by key, to make it more manageable. Therefore, we should only allow the
user to use state if he provides a key, for example using the (non-existant)
keyBy(). Then we can partition the data and the operators know for which part
of the state they are responsible.
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