Top 20 Apache Oozie Interview Questions

This article was published as a part of the Data Science Blogathon.

Introduction

Apache Oozie is a Hadoop workflow scheduler. It is a system that manages the workflow of dependent tasks. Users can design Directed Acyclic Graphs of workflows that can be run in parallel and sequentially in Hadoop.

Image: https://oozie.apache.org/

Apache Oozie is an important topic in Data Engineering, so we shall discuss some Apache Oozie interview questions and answers. These questions and answers will help you prepare for Apache Oozie and Data Engineering Interviews.

Read more about Apache Oozie here.

Interview Questions on Apache Oozie

1. What is Oozie?

Oozie is a Hadoop workflow scheduler. Oozie allows users to design Directed Acyclic Graphs of workflows, which can then be run in Hadoop in parallel or sequentially. It can also execute regular Java classes, Pig operations, and interface with HDFS. It can run jobs both sequentially and concurrently.

2. Why do we need Apache Oozie?

Apache Oozie is an excellent tool for managing many tasks. There are several sorts of jobs that users want to schedule to run later, as well as tasks that must be executed in a specified order. Apache Oozie can make these types of executions much easier. Using Apache Oozie, the administrator or user can execute multiple independent jobs in parallel, run the jobs in a specific sequence, or control them from anywhere, making it extremely helpful.

3. What kind of application is Oozie?

4. What exactly is an application pipeline in Oozie?

5. What is a Workflow in Apache Oozie?

6. What are the major elements of the Apache Oozie workflow?

7. What are the functions of the Join and Fork nodes in Oozie?

8. What are the various control nodes in the Oozie workflow?

9. How can I set the start, finish, and error nodes for Oozie?

10. What exactly is an application pipeline in Oozie?

11. What are Control Flow Nodes?

12. What are Action Nodes?

13. Are Cycles supported by Apache Oozie Workflow?

14. What is the use of the Oozie Bundle?

15. How does a pipeline work in Apache Oozie?

16. Explain the role of the Coordinator in Apache Oozie?

17. What is the decision node’s function in Apache Oozie?

18. What are the various control flow nodes offered by Apache Oozie workflows for starting and terminating the workflow?

19. What are the various control flow nodes that Apache Oozie workflows offer for controlling the workflow execution path?

20. What is the default database Oozie uses to store job ids and statuses?

Conclusion

These Apache Oozie Interview Questions can assist you in becoming interview-ready for your upcoming personal interview. In Oozie-related interviews, interviewers usually ask the interviewee these questions.

To sum up:

• Apache Oozie is a distributed scheduling system to launch and manage Hadoop tasks.
• Oozie allows you to combine numerous complex jobs that execute in a specific order to complete a larger task.
• Two or more jobs within a specific set of tasks can be programmed to execute in parallel with Oozie.

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