Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/879#issuecomment-117986440
We may also try and think about how we assign timestamps. We have measured
in some experiments that it decreases peak throughput if you call
`System.currentTimeMillis()` for every record. Tricky thing is trying to figure
out when to call it. There is no way to determine that based on number of
records, but to measure delay since the last record, well, you need to call it
as well ;-)
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