Book Image

Apache Oozie Essentials

By : Jagat Singh
Book Image

Apache Oozie Essentials

By: Jagat Singh

Overview of this book

As more and more organizations are discovering the use of big data analytics, interest in platforms that provide storage, computation, and analytic capabilities is booming exponentially. This calls for data management. Hadoop caters to this need. Oozie fulfils this necessity for a scheduler for a Hadoop job by acting as a cron to better analyze data. Apache Oozie Essentials starts off with the basics right from installing and configuring Oozie from source code on your Hadoop cluster to managing your complex clusters. You will learn how to create data ingestion and machine learning workflows. This book is sprinkled with the examples and exercises to help you take your big data learning to the next level. You will discover how to write workflows to run your MapReduce, Pig ,Hive, and Sqoop scripts and schedule them to run at a specific time or for a specific business requirement using a coordinator. This book has engaging real-life exercises and examples to get you in the thick of things. Lastly, you’ll get a grip of how to embed Spark jobs, which can be used to run your machine learning models on Hadoop. By the end of the book, you will have a good knowledge of Apache Oozie. You will be capable of using Oozie to handle large Hadoop workflows and even improve the availability of your Hadoop environment.
Table of Contents (16 chapters)
Apache Oozie Essentials
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Running Oozie MapReduce job


Oozie has a command-line functionality to submit a job, which has just a MapReduce action. The command-line option that we saw in the previous action can be used anywhere when we have a Workflow or Coordinator with complex DAG.

To run Oozie job, which is just a simple MapReduce, we can use the command options shown in the following screenshot:

Oozie MapReduce command line

Here's an example:

oozie mapreduce -config job.properties -oozie http://localhost:11000/oozie

Tip

We can also choose to pass on variables such as input and output from the command line.

In this section, we made our Workflow using the MapReduce action and used the command-line Oozie job option with the job.properties file to run the same.

Let's move on to the next topic of Coordinators.