Sean R. Owen created SPARK-30132:
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Summary: 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
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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