Github user wangli1426 commented on the pull request:
https://github.com/apache/storm/pull/716#issuecomment-138752669
@HeartSaVioR
Thanks for voting +1.
By the way, in my original design, I didn't use timer to update the
histograms. Instant, the histograms were updated in ```notify()```. However,
such a design requires to call ```System.currentTimeMills()``` every time when
```notify()``` is called, to determine whether an update to the histograms is
needed. ```System.currentTimeMills()``` is fairly expensive to be called so
frequently. So, in current implementation, I use a timer to periodically update
the histograms.
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