[jira] [Resolved] (SPARK-7438) Validation Error while running countApproxDistinct with relative accuracy >= 0.38

["Sean Owen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-7438?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sean Owen resolved SPARK-7438.
------------------------------
       Resolution: Fixed
    Fix Version/s: 1.4.0

Issue resolved by pull request 5974
[https://github.com/apache/spark/pull/5974]

> Validation Error while running  countApproxDistinct  with relative accuracy  >= 0.38  
> --------------------------------------------------------------------------------------
>
>                 Key: SPARK-7438
>                 URL: https://issues.apache.org/jira/browse/SPARK-7438
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Core
>            Reporter: Vinod KC
>            Priority: Minor
>             Fix For: 1.4.0
>
>
> Eg Code: 
> val a = sc.parallelize(1 to 10000, 20)
> val b = a ++ a ++ a ++ a ++ a
> b.countApproxDistinct(0.38)
> "java.lang.IllegalArgumentException: requirement failed: p (3) must be at least 4"
> Issue 1: When relative accuracy  >= 0.38, IAE is thrown, as the precision p evaluates to 3.
> However,same input in countApproxDistinctByKey(0.38), works fine. Usage of relativeSD should be consistent in both countApproxDistinct and countApproxDistinctByKey
> Issue 2: Validation error message "p (3) must be at least 4" is not giving a clue on what went wrong.
> Issue 3: When relative accuracy < 0.000017, a proper validation error message is not shown from countApproxDistinct



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