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About Cassandra
What's new
CQL
Understanding the architecture
Planning a deployment
Installing
Initializing a cluster
Security
Database internals
Configuration
Operations
Backing up and restoring data
Cassandra tools
References
Moving data to/from other databases
Troubleshooting
Release notes

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Apache Cassandra 2.1™

About Cassandra
Documentation for developers and administrators on configuring, and using the features and capabilities of Apache Cassandra.
What's new
An overview of new features in Apache Cassandra.
CQL
Cassandra Query Language (CQL) is the default and primary interface into the Cassandra DBMS.
Understanding the architecture
Important topics for understanding Cassandra.
Planning a deployment
Vital information about successfully deploying a Cassandra cluster.
Installing
Various installation methods.
Initializing a cluster
Topics for deploying a cluster.
Security
Topics for securing Cassandra.
Database internals
Topics about the Cassandra database.
- Storage engine
  A description about Cassandra's storage structure and engine.
- Separate table directories
  Cassandra provides fine-grained control of table storage on disk.
- Cassandra storage basics
  Understanding how Casssandra stores data.
- The write path of an update
  A brief description of the write path of an update.
- About deletes
  How Cassandra deletes data and why deleted data can reappear.
- About hinted handoff writes
  How hinted handoff works and how it optimizes the cluster.
- Reads
  How reads work and factors affecting them.
- About transactions and concurrency control
  A brief description about transactions and concurrency control.
- Data consistency
  Topics about how up-to-date and synchronized a row of data is on all replicas.
  - About data consistency
    An introduction to how Cassandra extends eventual consistency with tunable consistency.
  - About built-in consistency repair features
    Built-in repair utilities to ensure that data remains consistent across replicas.
  - Configuring data consistency
    Consistency levels in Cassandra can be configured to manage availability versus data accuracy.
  - Read requests
    The three types of read requests that a coordinator node can send to a replica.
  - Write requests
    How write requests work.
Configuration
Configuration topics.
Operations
Operation topics.
Backing up and restoring data
Cassandra backs up data by taking a snapshot of all on-disk data files (SSTable files) stored in the data directory.
Cassandra tools
Topics for Cassandra tools.
References
Reference topics.
Moving data to/from other databases
Solutions for migrating from other databases.
Troubleshooting
Release notes
How to find the Apache Cassandra release notes.

Data consistency

Topics about how up-to-date and synchronized a row of data is on all replicas.

About data consistency
An introduction to how Cassandra extends eventual consistency with tunable consistency.
About built-in consistency repair features
Built-in repair utilities to ensure that data remains consistent across replicas.
Configuring data consistency
Consistency levels in Cassandra can be configured to manage availability versus data accuracy.
Read requests
The three types of read requests that a coordinator node can send to a replica.
Write requests
How write requests work.

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