Github user bowenli86 commented on the issue:
https://github.com/apache/flink/pull/4662
There's no output with 100/50 either, because the default text we use at
WordCountData.WORDS is not very long and cannot satisfy the count window size.
There's only 11 window ouputs even with 10/5, which are still a bigger size.
I prefer 4/2, but also think 10/5 is also ok, because the program is for
demo purpose and new users would doubt the program's accuracy if it doesn't
generate enough output. What do you think? @zentol
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