Github user unsleepy22 commented on the pull request:
https://github.com/apache/storm/pull/1143#issuecomment-187766058
I agree that use System.currentTimeMillis() instead of System.nanoTime()
will improve performance, but if the code between the timing part is very fast,
say, mostly < 1ms, then we possibly won't get useful metrics using
System.currentTimeMillis.
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