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  • Book Overview & Buying Apache Cassandra Essentials
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Apache Cassandra Essentials

Apache Cassandra Essentials

By : Nitin Padalia
4.5 (2)
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Apache Cassandra Essentials

Apache Cassandra Essentials

4.5 (2)
By: Nitin Padalia
Buy this Book

Overview of this book

Apache Cassandra Essentials takes you step-by-step from from the basics of installation to advanced installation options and database design techniques. It gives you all the information you need to effectively design a well distributed and high performance database. You’ll get to know about the steps that are performed by a Cassandra node when you execute a read/write query, which is essential to properly maintain of a Cassandra cluster and to debug any issues. Next, you’ll discover how to integrate a Cassandra driver in your applications and perform read/write operations. Finally, you’ll learn about the various tools provided by Cassandra for serviceability aspects such as logging, metrics, backup, and recovery.
Table of Contents (9 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
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1
1. Getting Your Cassandra Cluster Ready
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1. Getting Your Cassandra Cluster Ready
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Installation
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The installation layout
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Configuration files
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Running a Cassandra server
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Summary
2
2. An Architectural Overview
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2. An Architectural Overview
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Background
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Cassandra cluster overview
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Data distribution
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Replication
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SimpleStrategy
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NetworkTopologyStrategy
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Virtual nodes
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Adding nodes to our cluster
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Create keyspace and column family
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Summary
3
3. Creating Database and Schema
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3. Creating Database and Schema
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A database and schema
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Data types
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Secondary indexes
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Allowing filtering
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TTL
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Conditional querying
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Write operations
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Lightweight transactions
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Batch statements
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Summary
4
4. Read and Write – Behind the Scenes
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4. Read and Write – Behind the Scenes
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Write operations
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Read operations
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Delete operations
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Data consistency
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Tracing Cassandra queries
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Summary
5
5. Writing Your Cassandra Client
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5. Writing Your Cassandra Client
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Connecting to a Cassandra cluster
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Reading and writing to the Cassandra cluster
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Mapping API
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Tracing Cassandra queries using Java driver
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Summary
6
6. Monitoring and Tuning a Cassandra Cluster
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6. Monitoring and Tuning a Cassandra Cluster
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Monitoring a Cassandra cluster
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Tuning Cassandra nodes
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Summary
7
7. Backup and Restore
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7. Backup and Restore
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Taking backup of a Casandra cluster
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Restoring data to Cassandra
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Removing nodes from Cassandra cluster
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Adding nodes to a Cassandra cluster
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Replacing dead nodes in a cluster
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Summary
8
Index
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Index

Delete operations

In Cassandra, a delete operation does not delete the requested data immediately. Instead, it puts a marker over the deleted data. This marker is called a tombstone. A tombstone's age is defined by per-column family option gc_grace_seconds. After gc_grace_seconds has passed, Cassandra clears data marked with tombstones, and it clears all tombstones during the compaction of the column family.

Tip

If a node is down for loger than the time specified by gc_grace_seconds and is recovered, there is a chance that the deleted data will come back. To avoid such scenarios, nodes dead for such a long time should be replaced instead of being added back to the cluster.

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Apache Cassandra Essentials
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