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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.
Configuration
Configuration topics.
Operations
Operation topics.
- Monitoring Cassandra
  Monitoring topics.
- Tuning Bloom filters
  Cassandra uses Bloom filters to determine whether an SSTable has data for a particular row.
- Data caching
  Data caching topics.
- Configuring memtable throughput
  Configuring memtable throughput to improve write performance.
- Configuring compaction
  Steps for configuring compaction. The compaction process merges keys, combines columns, evicts tombstones, consolidates SSTables, and creates a new index in the merged SSTable.
- Compression
  Compression maximizes the storage capacity of Cassandra nodes by reducing the volume of data on disk and disk I/O, particularly for read-dominated workloads.
- Testing compaction and compression
  Enabling write survey mode.
- Tuning Java resources
  Tuning the Java Virtual Machine (JVM) can improve performance or reduce high memory consumption.
- Purging gossip state on a node
  Correcting a problem in the gossip state.
- Repairing nodes
  Node repair topics.
- Adding or removing nodes, datacenters, or clusters
  Topics for adding or removing nodes, datacenters, or clusters.
  - Adding nodes to an existing cluster
    Steps to add nodes when using virtual nodes.
  - Adding a datacenter to a cluster
    Steps for adding a datacenter to an existing cluster.
  - Replacing a dead node or dead seed node
    Steps to replace a node that has died for some reason, such as hardware failure.
  - Replacing a running node
    Two methods for replacing a node with a new node, such as when updating to newer hardware or performing proactive maintenance.
  - Moving a node from one rack to another
  - Decommissioning a datacenter
    Steps to properly remove a datacenter so no information is lost.
  - Removing a node
    Reduce the size of a datacenter.
  - Switching snitches
    Steps for switching snitches.
  - Changing keyspace strategy
    Changing the strategy of a keyspace from SimpleStrategy to NetworkTopologyStrategy.
  - Edge cases for transitioning or migrating a cluster
    Unusual migration scenarios without interruption of service.
  - Adding or replacing single-token nodes
    Steps for adding or replacing nodes in single-token architecture clusters.
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.

Adding or removing nodes, datacenters, or clusters

Topics for adding or removing nodes, datacenters, or clusters.

Adding nodes to an existing cluster
Steps to add nodes when using virtual nodes.
Adding a datacenter to a cluster
Steps for adding a datacenter to an existing cluster.
Replacing a dead node or dead seed node
Steps to replace a node that has died for some reason, such as hardware failure.
Replacing a running node
Two methods for replacing a node with a new node, such as when updating to newer hardware or performing proactive maintenance.
Moving a node from one rack to another
Decommissioning a datacenter
Steps to properly remove a datacenter so no information is lost.
Removing a node
Reduce the size of a datacenter.
Switching snitches
Steps for switching snitches.
Changing keyspace strategy
Changing the strategy of a keyspace from SimpleStrategy to NetworkTopologyStrategy.
Edge cases for transitioning or migrating a cluster
Unusual migration scenarios without interruption of service.
Adding or replacing single-token nodes
Steps for adding or replacing nodes in single-token architecture clusters.

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