Cassandra Wiki

Cassandra is a highly scalable, eventually consistent, distributed, structured key-value store. Cassandra brings together the distributed systems technologies from Dynamo and the data model from Google's BigTable. Like Dynamo, Cassandra is eventually consistent. Like BigTable, Cassandra provides a ColumnFamily-based data model richer than typical key/value systems.

Cassandra was open sourced by Facebook in 2008, where it was designed by Avinash Lakshman (one of the authors of Amazon's Dynamo) and Prashant Malik ( Facebook Engineer ). In a lot of ways you can think of Cassandra as Dynamo 2.0 or a marriage of Dynamo and BigTable. Cassandra is in production use at Facebook but is still under heavy development.

General Information

• Official Cassandra Website (download, bug-tracking, mailing-lists, etc)

• Articles and Presentations about Cassandra.

• Architecture Overview

• Cassandra Limitations (where Cassandra is not a good fit)

• FAQ

• Mailing Lists

  • Users: user@cassandra.apache.org (subscribe) (archives) (incubator archives)

  • Developers: dev@cassandra.apache.org (subscribe) (archives) (incubator archives)

  • Commits: commits@cassandra.apache.org (subscribe)

For Application Developers

• Datastax's Cassandra documentation

• Getting Started (aaron morton - working on this)

• Cassandra Data model

  • Data Types (comparators)

  • Counters

  • SecondaryIndexes

• Client Software

  • Language Clients interfaces for Ruby, Python, Scala and more

  • Thrift API Documentation

  • Cassandra Query Language

• Performance Tuning

• Memtable Thresholds

• Large data set considerations

• Integration with other projects / products including Hadoop

For Administrators

• Installing Cassandra

• Creating a multi-node cluster

• Cassandra on Windows

• Configuration on Rackspace or Amazon Web Services

• Cassandra Hardware

• Embedding

• Running Cassandra

• Operations Guide

• Configuration (hani elabed - working on this)

• Administration Tools

  • External Administration Tools

  • cassandra-cli Command Line Interface (-> draft:CassandraCli_maki_draft2 )

  • json2sstable import tool

  • nodetool

  • sstable2json export tool

  • sstablekeys export tool

  • sstableloader bulk import tool

• Monitoring

  • JMX Interface

  • Mx4J JMX interface

Architecture

• Architecture Overview

• Commit Log during writes

• Memtables, SSTables and Compaction

• Hinted Handoff during writes

• Read Repair during reads

• Distributed Deletes and Tombstones

• Anti-Entropy during repair

• Gossip between nodes

For Cassandra Developers

• How To Build

• CLI Design

• How To Contribute?

• How To Commit?

• How To Release (Note: currently a work in progress) (Note: only relevant to Cassandra Committers)

Related Information

• Thrift, used by Cassandra for client access

• RelatedProjects: Projects using or extending Cassandra

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