STORM-1729 (1.x) Get rid of reflections while recording stats

[HeartSaVioR]

• define MultiCount/LatencyStatAndMetric in let statement and set type hint to there

Before applying I got around 860,000 emitted/sec from BasicTopology, and after applying I got around 940,000~960,000 emitted/sec.
topology.disruptor.batch.size=10000

And it removes reflection warnings from lines which are recording stats.

Btw, though after applying this, invokeMatchingMethod is still on top 10. I'll track where it occurs.

[unsleepy22]

+1
BTW. can we have more performance tests in more cases so that we can see the overall performance change?

[HeartSaVioR]

@unsleepy22
Yeah, I really want to, but in order to do that we need a stable machines and benchmark tests.
(I'm doing performance tests on my laptop for now.)
We can give it a try with https://github.com/yahoo/streaming-benchmarks first.

[HeartSaVioR]

And also ThroughputVsLatency topology in storm-starter.

[HeartSaVioR]

@unsleepy22 Let's move to #1362. I'll address the performance tests there.

[HeartSaVioR]

Please refer #816. I'm confused completely why this happens cause those lines are introduced at 16c33ef which fixes the reflection issue. Why it is broken again?

[ptgoetz]

+1 (forgot to do so before merging)