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https://issues.apache.org/jira/browse/SPARK-14630?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15241253#comment-15241253
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Apache Spark commented on SPARK-14630:
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User 'lw-lin' has created a pull request for this issue:
https://github.com/apache/spark/pull/12396
> Code style: public abstract methods should have explicit return types
> ---------------------------------------------------------------------
>
> Key: SPARK-14630
> URL: https://issues.apache.org/jira/browse/SPARK-14630
> Project: Spark
> Issue Type: Improvement
> Components: Build
> Affects Versions: 2.0.0
> Reporter: Liwei Lin
> Priority: Minor
>
> Currently many public abstract methods (in abstract classes as well as
> traits) don't declare return types explicitly, such as
> [o.a.s.streaming.dstream.InputDStream|https://github.com/apache/spark/blob/master/streaming/src/main/scala/org/apache/spark/streaming/dstream/InputDStream.scala#L110]:
> {code}
> def start() // should be: def start(): Unit
> def stop() // should be: def stop(): Unit
> ...
> {code}
> [o.a.s.streaming.receiver.Receiver|https://github.com/apache/spark/blob/master/streaming/src/main/scala/org/apache/spark/streaming/receiver/Receiver.scala#L102]:
> {code}
> def onStart() // should be: def onStart(): Unit
> def onStop() // should be: def onStop(): Unit
> ...
> {code}
> These methods exist in core, sql, streaming.
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