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Created April 8, 2016 19:37
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Improve random number generation to reduce contention
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htrace
In TraceCreator.java, Math.random() is used for random number generation.
According to Java API (Link: http://docs.oracle.com/javase/8/docs/api/java/lang/Math.html#random--),
it's suggested that each thread has their own random number generator to reduce contention.
This pull request improved the condition by replacing Math.random() with Random.nextInt().
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