Github user gyfora commented on the pull request:
https://github.com/apache/flink/pull/1208#issuecomment-145020604
"Windows on unkeyed data streams (non-parallel windows)"
I still think that this gives a bad false impression of executing all
global windows including time in a non-parallel way.
I can already here people say that Spark can do global time windows in
parallel while Flink cant :P
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