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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