Github user gyfora commented on the pull request:
https://github.com/apache/flink/pull/980#issuecomment-128001829
In general I think it has a little more complexity than necessary coming
from the actual application implemented here. I would get rid of the
PrefixCounts and the specific operators for this counting application and would
replace them with simple filters and maps.
I think that would serve the same purpose and would not hide the actual
notification tests with a lot of unnecessary details
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