Book Image

Learning Cascading

Book Image

Learning Cascading

Overview of this book

Table of Contents (18 chapters)
Learning Cascading
Credits
Foreword
About the Authors
About the Reviewers
www.PacktPub.com
Preface
7
Optimizing the Performance of a Cascading Application
Index

Summary


In this chapter, we learned about the Operation class hierarchy, how operations are marked by interfaces, and also about operation lifecycle and calling sequences. We also looked at how Tuple and TupleEntry objects are supplied by pipes and used by operations, and how operations can use Context objects to store a state. Lastly, we looked at the isSafe() method and how it is used to prevent the same record from being processed more than once.

In the next chapter, armed with our current understanding of operations, we will learn how we can extend our Cascading application's functionality by creating custom operations.