Github user davies commented on the pull request:
https://github.com/apache/spark/pull/3351#issuecomment-63890984
micro benchmark for possion (with fraction=0.1):
old one:
```
$ python -m timeit -s from pyspark.rddsampler import RDDSamplerBase; b =
RDDSamplerBase(True, 42); b.initRandomGenerator(0)" "b.getPoissonSample(0.1)"
1000000 loops, best of 3: 0.952 usec per loop
```
new one:
```
$ python -m timeit -s "from pyspark.rddsampler import RDDSamplerBase; b =
RDDSamplerBase(True, 42); b.initRandomGenerator(0)" "b.getPoissonSample(0.1)"
1000000 loops, best of 3: 0.56 usec per loop
```
So it's about two times faster.
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