YCSB Zipfian generator

Mohammad Khalajirequested to merge
ycsb-zipfian into master

A new Zipfian generator with better performance. This generator incurs fewer L3 cache misses because it doesn't have to look up a sum_probs array to find an appropriate key to return.

I took it from benchbase, which takes it from https://github.com/brianfrankcooper/YCSB/blob/master/core/src/main/java/site/ycsb/generator/ZipfianGenerator.java

The key quality is good:

image

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