Book Image

Learning Cassandra for Administrators

By : Vijay Parthasarathy
Book Image

Learning Cassandra for Administrators

By: Vijay Parthasarathy

Overview of this book

<p>Apache Cassandra is a massively scalable open source NoSQL database. Cassandra is perfect for managing large amounts of structured, semi-structured, and unstructured data across multiple data centers and the cloud. Cassandra delivers linear scalability and performance across many commodity servers with no single point of failure.<br /><br />This book starts by explaining how to derive the solution, basic concepts, and CAP theorem. You will learn how to install and configure a Cassandra cluster as well as tune the cluster for performance. After reading the book, you should be able to understand why the system works in a particular way, and you will also be able to find patterns (and/or use cases) and anti-patterns which would potentially cause performance degradation. Furthermore, the book explains how to configure Hadoop, vnodes, multi-DC clusters, enabling trace, enabling various security features, and querying data from Cassandra.<br /><br />Starting with explaining about the trade-offs, we gradually learn about setting up and configuring high performance clusters. This book will help the administrators understand the system better by understanding various components in Cassandra’s architecture and hence be more productive in operating the cluster. This book talks about the use cases and problems, anti-patterns, and potential practical solutions as opposed to raw techniques. You will learn about kernel and JVM tuning parameters that can be adjusted to get the maximum use out of system resources.<br /><br /><br /></p>
Table of Contents (14 chapters)

Create a keyspace


To create a keyspace, we should log in to the CQL shell. It can be found inside the bin directory. Help create keyspace on the CQL shell provides self-explanatory help on creating the keyspace:

CREATE KEYSPACE<ksname> WITH replication = {'class':'<strategy>'[,'<option>':<val>]};

The CREATE KEYSPACE statement creates a new top-level namespace (also known as a keyspace). Valid names are any strings constructed of alphanumeric characters and underscores. Names that do not work as valid identifiers or integers should be quoted as string literals. Properties such as replication_factor and datacenters to replicate are specified during creation as the key-value pairs in the replication map. 'class' (required) is the name of the replication strategy class which should be used for the new keyspace. Some often-used classes are SimpleStrategy and NetworkTopologyStrategy. Most strategies require additional arguments that can be supplied as key-value pairs in the...