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Cassandra High Availability

You're reading from Cassandra High Availability

Product type Book

Published in Dec 2014

Publisher Packt

ISBN-13 9781783989126

Pages 186 pages

Edition 1st Edition

Languages

Concepts

Database Administration

Author (1):

Robbie Strickland

Table of Contents (16) Chapters

Cassandra High Availability

Credits

About the Author

About the Reviewers

www.PacktPub.com

Preface

1. Cassandra's Approach to High Availability

2. Data Distribution

3. Replication

4. Data Centers

5. Scaling Out

6. High Availability Features in the Native Java Client

7. Modeling for High Availability

8. Antipatterns

9. Failing Gracefully

Index

The replication factor

On the surface, setting the replication factor seems to be a fundamentally straightforward idea. You configure Cassandra with the number of replicas you want to maintain (during keyspace creation), and the system dutifully performs the replication for you, thus protecting you when something goes wrong. So by defining a replication factor of three, you will end up with a total of three copies of the data. There are a number of variables in this equation, and we'll cover many of these in detail in this chapter. Let's start with the basic mechanics of setting the replication factor.

Replication strategies

One thing you'll quickly notice is that the semantics to set the replication factor depend on the replication strategy you choose. The replication strategy tells Cassandra exactly how you want replicas to be placed in the cluster.

There are two strategies available:

SimpleStrategy: This strategy is used for single data center deployments. It is fine to use this for testing...

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Authors (1)

Robbie Strickland

Robbie Strickland has been involved in the Apache Cassandra project since 2010, and he initially went to production with the 0.5 release. He has made numerous contributions over the years, including work on drivers for C# and Scala and multiple contributions to the core Cassandra codebase. In 2013 he became the very first certified Cassandra developer, and in 2014 DataStax selected him as an Apache Cassandra MVP. Robbie has been an active speaker and writer in the Cassandra community and is the founder of the Atlanta Cassandra Users Group. Other examples of his writing can be found on the DataStax blog, and he has presented numerous webinars and conference talks over the years.

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