Availability : Apache Hadoop 2.0 and above.

It is a Framework for YARN-based and data processing applications in Hadoop

It allows a complex directed-acyclic-graph of tasks for processing data

Directed Acyclic Graph (DAG) – defines the overall job. Each DAG object represents a job

Vertex – assists in running the user logic with the resources. Each Vertex refers to a step in the job

Edge – defines the connection between producer and consumer vertices.