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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.
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.
- About the nodetool utility
  A command line interface for managing a cluster.
- The cassandra utility
  Cassandra start-up parameters can be run from the command line (in Tarball installations) or specified in the cassandra-env.sh file (Package or Tarball installations).
- The cassandra-stress tool
  A Java-based stress testing utility for basic benchmarking and load testing a Cassandra cluster.
- SSTable utilities
  Tools for using, upgrading, and changing Cassandra SSTables.
  - sstableexpiredblockers
    The sstableexpiredblockers utility will reveal blocking SSTables that prevent an SSTable from dropping.
  - sstablekeys
    The sstablekeys utility dumps table keys.
  - sstablelevelreset
    The sstablelevelreset utility will reset the level to 0 on a given set of SSTables.
  - sstableloader (Cassandra bulk loader)
    Provides the ability to bulk load external data into a cluster, load existing SSTables into another cluster with a different number of nodes or replication strategy, and restore snapshots.
  - sstablemetadata
    The sstablemetadata utility prints metadata about a specified SSTable.
  - sstableofflinerelevel
    The sstableofflinerelevel utility relevels SSTables.
  - sstablerepairedset
    The sstablerepairedset utility will reset the level to 0 on a given set of SSTables.
  - sstablescrub
    An offline version of nodetool scrub. It attempts to remove the corrupted parts while preserving non-corrupted data.
  - sstablesplit
    Use this tool to split SSTables files into multiple SSTables of a maximum designated size.
  - The sstableupgrade tool
    Upgrade the SSTables in the specified table or snapshot to match the currently installed version of Cassandra.
  - sstable2json
    Converts the on-disk SSTable representation of a table into a JSON formatted document.
  - json2sstable
    Converts a JSON representation of a table (aka column family) to a Cassandra usable SSTable format.
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.

SSTable utilities

Tools for using, upgrading, and changing Cassandra SSTables.

sstableexpiredblockers
The sstableexpiredblockers utility will reveal blocking SSTables that prevent an SSTable from dropping.
sstablekeys
The sstablekeys utility dumps table keys.
sstablelevelreset
The sstablelevelreset utility will reset the level to 0 on a given set of SSTables.
sstableloader (Cassandra bulk loader)
Provides the ability to bulk load external data into a cluster, load existing SSTables into another cluster with a different number of nodes or replication strategy, and restore snapshots.
sstablemetadata
The sstablemetadata utility prints metadata about a specified SSTable.
sstableofflinerelevel
The sstableofflinerelevel utility relevels SSTables.
sstablerepairedset
The sstablerepairedset utility will reset the level to 0 on a given set of SSTables.
sstablescrub
An offline version of nodetool scrub. It attempts to remove the corrupted parts while preserving non-corrupted data.
sstablesplit
Use this tool to split SSTables files into multiple SSTables of a maximum designated size.
The sstableupgrade tool
Upgrade the SSTables in the specified table or snapshot to match the currently installed version of Cassandra.
sstable2json
Converts the on-disk SSTable representation of a table into a JSON formatted document.
json2sstable
Converts a JSON representation of a table (aka column family) to a Cassandra usable SSTable format.

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