Github user davidyan74 commented on the pull request:
https://github.com/apache/incubator-apex-core/pull/194#issuecomment-173416610
@gauravgopi123 Calculating latency at same window boundaries was the
original implementation. But that means the latency of some operators may not
be up to date because of one slow operator in the DAG. If an operator is 1
minute slower than the rest of the DAG, the reported latency of all other
operators is one minute old.
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