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https://issues.apache.org/jira/browse/SPARK-30132?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17005841#comment-17005841
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Sean R. Owen commented on SPARK-30132:
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https://github.com/scala/bug/issues/11840
> Scala 2.13 compile errors from Hadoop LocalFileSystem subclasses
> ----------------------------------------------------------------
>
> Key: SPARK-30132
> URL: https://issues.apache.org/jira/browse/SPARK-30132
> Project: Spark
> Issue Type: Sub-task
> Components: Spark Core
> Affects Versions: 3.0.0
> Reporter: Sean R. Owen
> Priority: Minor
>
> A few classes in our test code extend Hadoop's LocalFileSystem. Scala 2.13
> returns a compile error here - not for the Spark code, but because the Hadoop
> code (it says) illegally overrides appendFile() with slightly different
> generic types in its return value. This code is valid Java, evidently, and
> the code actually doesn't define any generic types, so, I even wonder if it's
> a scalac bug.
> So far I don't see a workaround for this.
> This only affects the Hadoop 3.2 build, in that it comes up with respect to a
> method new in Hadoop 3. (There is actually another instance of a similar
> problem that affects Hadoop 2, but I can see a tiny hack workaround for it).
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