Github user aarondav commented on the pull request: https://github.com/apache/incubator-spark/pull/605#issuecomment-35228095 Moving these to src/main/java is a good idea, but I wonder if most of these files would be better refactored into Scala. This should be trivial for all except JavaSparkContextVarargsWorkaround, which I would be happy to see stay go into src/main/java. The others are either very core Spark code (StorageLevels and SparkFiles) or linked closely with Scala code (Function, etc.), so it'd be pleasant if they could stay in the same directory as their peers. Such a refactor would maintain API compatibility but break binary compatibility. This should be perfectly fine for the 1.0 release, though.
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