Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/1208#issuecomment-145024435
Global windows are not parallel, not in any system, it is inherent in the
operation.
You can pre-aggregate in parallel, if the windows are time windows. These
are probably the most common windows. Any other windows are not even supported
in any other system that I have worked with...
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