@Retention(value=RUNTIME)
@Target(value={TYPE,FIELD,METHOD,PARAMETER,CONSTRUCTOR,LOCAL_VARIABLE,PACKAGE})
public @interface AlphaComponent
A new component of Spark which may have unstable API's.
NOTE: If there exists a Scaladoc comment that immediately precedes this annotation, the first
line of the comment must be "" with no trailing blank line. This is because
of the known issue that Scaladoc displays only either the annotation or the comment, whichever
comes first.