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https://issues.apache.org/jira/browse/FLINK-11231?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16732829#comment-16732829
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Aljoscha Krettek commented on FLINK-11231:
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The Scala API and Java API work slightly differently. For Java, specific
operations are represented by a {{SingleOutputStreamOperator}}, which is a
subclass of {{DataStream}}. For Scala, everything is a {{DataStream}}. For Java
it's like this because you technically can only set a parallelism on an actual
operation. Both have a method {{setParallelism()}}.
If we wanted to unify the interfaces, we would have to unify how {{DataStream}}
behaves, changing methods is not enough.
> Unified the definition of Java DataStream and Scala DataStream interface for
> set parallelism
> --------------------------------------------------------------------------------------------
>
> Key: FLINK-11231
> URL: https://issues.apache.org/jira/browse/FLINK-11231
> Project: Flink
> Issue Type: Improvement
> Components: DataStream API
> Affects Versions: 1.8.0
> Reporter: sunjincheng
> Priority: Major
>
> For Unified the definition of Java DataStream and Scala DataStream interface,
> in this JIRA. will do the following changes:
> # Remove or deprecated `setParallelism` and `setMaxParallelism` for
> `DataStream.scala`
> # Add `getTransformation` for for `DataStream.scala`.
> What to you think? [~till.rohrmann] welcome any feedback...
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