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From "Sean R. Owen (Jira)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-30132) Scala 2.13 compile errors from Hadoop LocalFileSystem subclasses
Date Mon, 30 Dec 2019 22:52:00 GMT

    [ https://issues.apache.org/jira/browse/SPARK-30132?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17005841#comment-17005841
] 

Sean R. Owen commented on SPARK-30132:
--------------------------------------

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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