In Beam Documentation - Programming Guide - Applying transform - Core Beam transform - ParDo section
———————————————————————————————————————————————————————————— When you apply a ParDo transform, you’ll need to provide user code in the form of a DoFn object. DoFn is a Beam SDK class that defines a distribured processing function. ———————————————————————————————————————————————————————————— It is possible to grasp the meaning, But It is considered correct to change distribured to distributed.