Apache Beam has some similarities with Apache Spark. One of them is the definition of processing pipeline as a Directed Acyclic Graph.
As we already know, RDD is the main data concept of Spark. It's created either explicitly or implicitly, through computations called transformations and actions. But these computations are all organized as a graph and scheduled by Spark's components. This graph is called DAG and it's the main topic of this post.
