Github user nickwallen commented on the issue:
https://github.com/apache/incubator-metron/pull/362
There are a couple of constraints on this parameter. (1) The profile TTL
must be greater than the period duration. (2) It doesn't make sense for a
profile to be invalidated part way through a period. I could have made the
profile TTL specified by time units, but then I would have to manually validate
these constraints. My thought was that if I allow the user to specify the
number of periods, then the constraints are mostly self-validating.
I also think, to some degree, it makes sense for the profile TTL to scale
with the period duration. But I am not sure I've fully convinced myself of
this yet.
Still think time units are better?
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