[jira] [Created] (SPARK-4294) The same function should have the same realization.

["Yadong Qi (JIRA)" <ji...@apache.org>]

Yadong Qi created SPARK-4294:
--------------------------------

             Summary: The same function should have the same realization.
                 Key: SPARK-4294
                 URL: https://issues.apache.org/jira/browse/SPARK-4294
             Project: Spark
          Issue Type: Improvement
          Components: Streaming
    Affects Versions: 1.1.0
            Reporter: Yadong Qi
            Priority: Minor
             Fix For: 1.2.0


In class TransformedDStream:
require(parents.length > 0, "List of DStreams to transform is empty")
require(parents.map(_.ssc).distinct.size == 1, "Some of the DStreams have different contexts")
require(parents.map(_.slideDuration).distinct.size == 1,
    "Some of the DStreams have different slide durations")

In class UnionDStream:
  if (parents.length == 0) {
    throw new IllegalArgumentException("Empty array of parents")
  }

  if (parents.map(_.ssc).distinct.size > 1) {
    throw new IllegalArgumentException("Array of parents have different StreamingContexts")
  }

  if (parents.map(_.slideDuration).distinct.size > 1) {
    throw new IllegalArgumentException("Array of parents have different slide times")
  }

The function is the same, but the realization is not. I think they shoule be the same.



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