[jira] [Created] (SPARK-14873) Java sampleByKey methods take ju.Map but with Scala Double values; results in type Object

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

Sean Owen created SPARK-14873:
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             Summary: Java sampleByKey methods take ju.Map but with Scala Double values; results in type Object
                 Key: SPARK-14873
                 URL: https://issues.apache.org/jira/browse/SPARK-14873
             Project: Spark
          Issue Type: Bug
          Components: Java API, Spark Core
    Affects Versions: 1.6.1
            Reporter: Sean Owen
            Assignee: Sean Owen
            Priority: Minor


There's this odd bit of code in {{JavaStratifiedSamplingExample}}:

{code}
    // specify the exact fraction desired from each key Map<K, Object>
    ImmutableMap<Integer, Object> fractions =
      ImmutableMap.of(1, (Object)0.1, 2, (Object) 0.6, 3, (Object) 0.3);

    // Get an approximate sample from each stratum
    JavaPairRDD<Integer, Character> approxSample = data.sampleByKey(false, fractions);
{code}

It highlights a problem like that in https://issues.apache.org/jira/browse/SPARK-12604 where Scala primitive types are used where Java requires an object, and the result is that a signature that logically takes Double (objects) takes an Object in the Java API. It's an easy, similar fix.



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