Github user senorcarbone commented on the pull request:
https://github.com/apache/flink/pull/1208#issuecomment-145028978
From a quick read on the documentation (and prior knowledge from google
dataflow) it is easy to get a full picture of the new semantics. Even though I
like it from a engineering perspective, It needs to be pointed out though that
the addition of the *Assigner* restricts our previous windowing semantics to
periodic windows, i.e. at the moment you receive a record you have to know all
the possible buckets this record will fall into while before we did not have
such a constraint. In other words we no longer support dynamic windows where
range and slide can change dynamically.
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