Github user Shiti commented on the pull request:
https://github.com/apache/spark/pull/2520#issuecomment-59886741
The reason for this issue is that the Maven build definition and plugin
configuration of yarn-alpha and yarn-stable is the same as that for yarn
common. So, the `SettingKey scalaSource` is set to that of the parent for the
child projects and since `scalaSource` is a `SettingKey[File]`, we cannot add
multiple Scala sources for the same project. The scalaStyle plugin depends on
this `SettingKey` to determine Scala files. Modifying the settings for yarn
specific projects in the Scala Build file when required is a better approach to
fix this issue.
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