[jira] [Resolved] (SPARK-4294) UnionDStream stream should express the requirements in the same way as TransformedDStream

["Tathagata Das (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-4294?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tathagata Das resolved SPARK-4294.
----------------------------------
    Resolution: Fixed

> UnionDStream stream should express the requirements in the same way as TransformedDStream
> -----------------------------------------------------------------------------------------
>
>                 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
>            Assignee: Tathagata Das
>            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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