Github user james-sirota commented on the issue: https://github.com/apache/incubator-metron/pull/450 I think taking the string as an argument is really powerful, but it's also really flexible. "1 hour window every 24 hours starting from 14 days ago including the current day of the week excluding weekends, holidays:us" is a really long string. I was thinking maybe define a grammar to look something like: <command> = <window_duration> <window_period> <window_limit> <window_inclusions> <window_exlcusions> <holidays_spec> <window_duration> = number <unit_spec> <unit_spec> = MINUTS|HOURS|DAYS ...or something like that...a grammar for constructing this string
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