Like the normal, sequential collections library, Scala’s parallel collections library contains a large number of collection operations which exist uniformly on many different parallel collection implementations. And like the sequential collections library, Scala’s parallel collections library seeks to prevent code duplication by likewise implementing most operations in terms of parallel collection “templates” which need only be defined once and can be flexibly inherited by many different parallel collection implementations.
This is a companion discussion topic for the original entry at http://docs.scala-lang.org//overviews/parallel-collections/architecture