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https://issues.apache.org/jira/browse/SPARK-13583?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen updated SPARK-13583:
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Assignee: Dongjoon Hyun
> Remove unused imports and add checkstyle rule
> ---------------------------------------------
>
> Key: SPARK-13583
> URL: https://issues.apache.org/jira/browse/SPARK-13583
> Project: Spark
> Issue Type: Task
> Components: Spark Core, Streaming
> Reporter: Dongjoon Hyun
> Assignee: Dongjoon Hyun
> Priority: Minor
> Fix For: 2.0.0
>
>
> After SPARK-6990, `dev/lint-java` keeps Java code healthy and helps PR review
> by saving much time.
> This issue aims to enforce `UnusedImports` rule by adding a `UnusedImports`
> rule to `checkstyle.xml` and fixing all existing unused imports.
> {code:title=checkstyle.xml|borderStyle=solid}
> + <module name="UnusedImports"/>
> {code}
> Unfortunately, `dev/lint-java` is not tested by Jenkins. (
> https://github.com/apache/spark/blob/master/dev/run-tests.py#L546 )
> This will also help Spark contributors to check by themselves before
> submitting their PRs.
> According to the [~srowen]'s comments, this PR also includes the removal of
> unused imports in Scala code. It will be done by manually because of the
> following two reasons.
> * Scalastyle does not have `UnusedImport` rule yet.
> * Scala 2.11.7 has a bug with `-Ywarn-unused-import` option.
> (https://issues.scala-lang.org/browse/SI-9616)
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