public @interface DeveloperApi
A lower-level, unstable API intended for developers.
Developer API's might change or be removed in minor versions of Spark.
NOTE: If there exists a Scaladoc comment that immediately precedes this annotation, the first
line of the comment must be ":: DeveloperApi ::" with no trailing blank line. This is because
of the known issue that Scaladoc displays only either the annotation or the comment, whichever