[jira] [Created] (SPARK-2145) Add lower bound on sampling rate to guarantee sampling performance

[Doris Xin (JIRA)]

Doris Xin created SPARK-2145:
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             Summary: Add lower bound on sampling rate to guarantee sampling 
performance
                 Key: SPARK-2145
                 URL: https://issues.apache.org/jira/browse/SPARK-2145
             Project: Spark
          Issue Type: Improvement
            Reporter: Doris Xin
            Priority: Minor


For extremely small sampling rates p < 10^-10, we want to prevent resampling 
caused by the RNG not returning completely random numbers. 



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