Book Image

Seven NoSQL Databases in a Week

By : Sudarshan Kadambi, Xun (Brian) Wu
Book Image

Seven NoSQL Databases in a Week

By: Sudarshan Kadambi, Xun (Brian) Wu

Overview of this book

This is the golden age of open source NoSQL databases. With enterprises having to work with large amounts of unstructured data and moving away from expensive monolithic architecture, the adoption of NoSQL databases is rapidly increasing. Being familiar with the popular NoSQL databases and knowing how to use them is a must for budding DBAs and developers. This book introduces you to the different types of NoSQL databases and gets you started with seven of the most popular NoSQL databases used by enterprises today. We start off with a brief overview of what NoSQL databases are, followed by an explanation of why and when to use them. The book then covers the seven most popular databases in each of these categories: MongoDB, Amazon DynamoDB, Redis, HBase, Cassandra, In?uxDB, and Neo4j. The book doesn't go into too much detail about each database but teaches you enough to get started with them. By the end of this book, you will have a thorough understanding of the different NoSQL databases and their functionalities, empowering you to select and use the right database according to your needs.
Table of Contents (16 chapters)
Title Page
Copyright and Credits
Dedication
Packt Upsell
Contributors
Preface
Index

Interacting with HBase – the HBase Client API


Now that we have an understanding of how to execute basic HBase operations via the shell, let's try and attempt them through the Java API:

Configuration conf = HBaseConfiguration.create();
Connection conn = ConnectionFactory.createConnection(conf); 

The recommended way in which the configuration should be provided to an HBase client application is to copy over the hbase-site.xml from the cluster and make it available on the classpath of the client application (typically included in src/main/resources).

The HBaseConfiguration class reads the hbase-site.xml and populates properties such as the Zookeeper quorum hosts and ports, within a Configuration object.

The ConnectionFactory class handles the lifecycle management of Connections to an HBase cluster. The Connection class encapsulates TCP connections to the RegionServers, as well as a local cache of the META region, which contains the region assignments.

Connections are heavyweight objects. Thankfully...