Apache Oozie is a workflow manager, designed especially for running Hadoop MapReduce jobs
It contains 2 parts:
It's a service:
JobControl
, it doesn't submit the tasks itself
A workflow is a DAG of action nodes and control-flow nodes
Action Nodes
Control Flow Nodes
The Oozie workflow is written in XML using Hadoop Process Definition language
Hue has Oozie Workflow editor - so it is possible to design workflows manually