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| <h1 class="clearfix">Cassandra</h1> |
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| <li><a href="/">Home</a></li> |
| <li><a href="/download/">Download</a></li> |
| <li><a href="http://wiki.apache.org/cassandra/GettingStarted">Getting Started</a></li> |
| <li><a href="http://www.planetcassandra.org">Planet Cassandra</a></li> |
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| <ul> |
| <li><a href="#tab-intro">Welcome</a></li> |
| <li><a href="#tab-presentation" title="Jonathan Ellis presents Cassandra at NoSQL Matters 2012">Video</a></li> |
| <li><a href="#tab-slides" title="Slides from NoSQL Matters presentation">Slides</a></li> |
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| <div id="tab-intro"> |
| <h2>Welcome to Apache Cassandra ™</h2> |
| <p> |
| The Apache Cassandra database is the right choice when you need scalability and high availability without compromising performance. <a href="http://techblog.netflix.com/2011/11/benchmarking-cassandra-scalability-on.html">Linear scalability</a> and proven fault-tolerance on commodity hardware or cloud infrastructure make it the perfect platform for mission-critical data. Cassandra's support for replicating across multiple datacenters is best-in-class, providing lower latency for your users and the peace of mind of knowing that you can survive regional outages. |
| </p> |
| <p> |
| Cassandra's data model offers the convenience of <a href="http://www.datastax.com/documentation/cql/3.1/cql/ddl/ddl_primary_index_c.html">column indexes</a> with the performance of log-structured updates, strong support for <a href="http://www.datastax.com/documentation/cql/3.1/cql/ddl/ddl_intro_c.html">denormalization</a> and <a href="http://maxgrinev.com/2010/07/12/do-you-really-need-sql-to-do-it-all-in-cassandra/">materialized views</a>, and powerful built-in caching. |
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| <div id="tab-presentation"> |
| <iframe width="500" height="281" src="http://player.vimeo.com/video/46188590?title=0&byline=0&portrait=0&color=ffffff" frameborder="0" webkitallowfullscreen="" mozallowfullscreen="" allowfullscreen=""></iframe> |
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| <div id="tab-slides"> |
| <iframe src="http://www.slideshare.net/slideshow/embed_code/15832310" width="427" height="356" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" style="border:1px solid #CCC;border-width:1px 1px 0;margin-bottom:5px" allowfullscreen webkitallowfullscreen mozallowfullscreen> </iframe> <div style="margin-bottom:5px"> <strong> <a href="http://www.slideshare.net/jbellis/cassandra-at-nosql-matters-2012" title="Cassandra at NoSql Matters 2012" target="_blank">Cassandra at NoSql Matters 2012</a> </strong> from <strong><a href="http://www.slideshare.net/jbellis" target="_blank">jbellis</a></strong> </div> |
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| <div id="download" class="span-7 push-1 last rc"> |
| <h2>Download</h2> |
| <div class="inner rc"> |
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| <p> |
| Latest release <b>2.2.2</b> (<a href="http://git-wip-us.apache.org/repos/asf?p=cassandra.git;a=blob_plain;f=CHANGES.txt;hb=refs/tags/cassandra-2.2.2">Changes</a>) |
| </p> |
| <p> |
| Stable release <b>2.1.10</b> (<a href="http://git-wip-us.apache.org/repos/asf?p=cassandra.git;a=blob_plain;f=CHANGES.txt;hb=refs/tags/cassandra-2.1.10">Changes</a>) |
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| <p><a class="filename" href="download/">Download options</a></p> |
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| <div id="features" class="container span-24"> |
| <h2 class="hdr">Overview</h2> |
| <div class="span-8"> |
| <ul class="biglist"> |
| <li> |
| <b>Proven</b> |
| <p> |
| Cassandra is in use at |
| <a href="http://www.slideshare.net/daveconnors/cassandra-puppet-scaling-data-at-15-per-month">Constant Contact</a>, |
| <a href="http://planetcassandra.org/blog/post/cassandra-at-cern-large-hadron-collider/">CERN</a>, |
| <a href="http://www.slideshare.net/planetcassandra/nyc-tech-day-using-cassandra-for-dvr-scheduling-at-comcast">Comcast</a>, |
| <a href="http://www.slideshare.net/jaykumarpatel/cassandra-at-ebay-13920376">eBay</a>, |
| <a href="http://planetcassandra.org/blog/post/analytics-at-github-with-apache-cassandra/">GitHub</a>, |
| <a href="http://planetcassandra.org/blog/post/godaddy-worlds-largest-domain-name-registrar-and-web-host-provider-utilizes-cassandra-for-replication-and-scalability/">GoDaddy</a>, |
| <a href="http://planetcassandra.org/blog/post/cassandra-used-to-build-scalable-and-highly-available-systems-at-hulu-streaming-content-to-over-5-million-subscribers/">Hulu</a>, |
| <a href="http://planetcassandra.org/blog/post/instagram-making-the-switch-to-cassandra-from-redis-75-instasavings/">Instagram</a>, |
| <a href="http://www.slideshare.net/planetcassandra/3-mohit-anchlia">Intuit</a>, |
| <a href="http://www.slideshare.net/adrianco/migrating-netflix-from-oracle-to-global-cassandra">Netflix</a>, |
| <a href="http://planetcassandra.org/blog/post/reddit-upvotes-apache-cassandras-horizontal-scaling-managing-17000000-votes-daily/">Reddit</a>, |
| <a href="http://planetcassandra.org/blog/post/make-it-rain-apache-cassandra-at-the-weather-channel-for-severe-weather-alerts/">The Weather Channel</a>, and <a href="http://planetcassandra.org/companies/">over 1500 more companies</a> that have large, active data sets. |
| </p> |
| <p>One of the largest production deployments is Apple's, with over 75,000 nodes storing over 10 PB of data. Other large Cassandra installations include Netflix (2,500 nodes, 420 TB, over 1 trillion requests per day), Chinese search engine Easou (270 nodes, 300 TB, over 800 million reqests per day), and eBay (over 100 nodes, 250 TB). |
| </p> |
| </li> |
| <li> |
| <b>Fault Tolerant</b> |
| <p> |
| Data is automatically replicated to multiple nodes for fault-tolerance. |
| Replication across multiple data centers is supported. Failed nodes |
| can be replaced with no downtime. |
| </p> |
| </li> |
| </ul> |
| </div> |
| <div class="span-8"> |
| <ul class="biglist"> |
| <li><b>Performant</b> |
| <p>Cassandra <a href="http://vldb.org/pvldb/vol5/p1724_tilmannrabl_vldb2012.pdf">consistently</a> <a href="http://www.datastax.com/resources/whitepapers/benchmarking-top-nosql-databases">outperforms</a> popular NoSQL alternatives in benchmarks and <a href="http://blog.markedup.com/2013/02/cassandra-hive-and-hadoop-how-we-picked-our-analytics-stack/">real applications</a>, primarily because of <a href="http://www.datastax.com/dev/blog/2012-in-review-performance">fundamental architectural choices</a>. |
| </p> |
| </li> |
| <li> |
| <b>Decentralized</b> |
| <p> |
| There are no single points of failure. There are no network bottlenecks. Every node in the cluster is identical. |
| </p> |
| </li> |
| <li> |
| <b>Durable</b> |
| <p>Cassandra is <a href="http://wiki.apache.org/cassandra/Durability">suitable for applications that can't afford to lose data</a>, even when an entire data center goes down. |
| </p> |
| </li> |
| </div> |
| <div class="span-8 last"> |
| <ul class="biglist"> |
| <li> |
| <b>You're in Control</b> |
| <p>Choose between synchronous or asynchronous replication for each update. Highly available asynchronous operations are optimized with features like <a href="http://wiki.apache.org/cassandra/HintedHandoff">Hinted Handoff</a> and <a href="http://wiki.apache.org/cassandra/ReadRepair">Read Repair</a>.</p> |
| </li> |
| <li> |
| <b>Elastic</b> |
| <p> |
| Read and write throughput both increase linearly as new machines are added, with no downtime or interruption to applications. |
| </p> |
| </li> |
| <li> |
| <b>Professionally Supported</b> |
| <p>Cassandra support contracts and services are available from <a href="http://wiki.apache.org/cassandra/ThirdPartySupport">third parties</a>. |
| </p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| |
| <div id="engage" class="container span-24"> |
| <h2 class="hdr">Learn More</h2> |
| <div id="wiki" class="span-6"> |
| <h3 class="hdr">On The Web</h3> |
| <ol class="biglist"> |
| <li><a href="http://wiki.apache.org/cassandra/GettingStarted">Getting Started</a></li> |
| <li><a href="http://planetcassandra.org">News and articles</a></li> |
| <li><a href="http://wiki.apache.org/cassandra/FAQ">FAQ</a></li> |
| <li><a href="http://wiki.apache.org/cassandra">Wiki</a></li> |
| </ol> |
| </div> |
| <div id="lists" class="span-9"> |
| <h3 class="hdr">Mailing Lists</h3> |
| <ul class="nobullets"> |
| <li><b>Users</b> – General discussion list for users. |
| <p><a href="mailto:user-subscribe@cassandra.apache.org">Subscribe</a> |
| | <a href="mailto:user-unsubscribe@cassandra.apache.org">Unsubscribe</a> |
| | <a href="http://www.mail-archive.com/user@cassandra.apache.org/">Archives</a></p> |
| </li> |
| <li><b>Developers</b> – Development related discussion. |
| <p><a href="mailto:dev-subscribe@cassandra.apache.org">Subscribe</a> |
| | <a href="mailto:dev-unsubscribe@cassandra.apache.org">Unsubscribe</a> |
| | <a href="http://www.mail-archive.com/dev@cassandra.apache.org/">Archives</a></p> |
| </li> |
| <li><b>Commits</b> – Commit notification source repository. |
| <p><a href="mailto:commits-subscribe@cassandra.apache.org">Subscribe</a> |
| | <a href="mailto:commits-unsubscribe@cassandra.apache.org">Unsubscribe</a> |
| | <a href="http://www.mail-archive.com/commits@cassandra.apache.org/">Archives</a></p> |
| <li><b>Client Libraries</b> – Discussion related to the development |
| of idiomatic client APIs. |
| <p><a href="mailto:client-dev-subscribe@cassandra.apache.org">Subscribe</a> |
| | <a href="mailto:client-dev-unsubscribe@cassandra.apache.org">Unsubscribe</a> |
| | <a href="http://www.mail-archive.com/client-dev@cassandra.apache.org/">Archives</a></p> |
| </li> |
| </ul> |
| </div> |
| <div id="irc" class="span-9 last"> |
| <h3 class="hdr">Chat</h3> |
| <p> |
| Many of the Cassandra developers and community members hang out in the <b>#cassandra</b> channel on <a href="http://freenode.net/" title="Freenode IRC network">irc.freenode.net</a>. |
| </p> |
| <p> |
| If you are new to IRC, you can use <a href="http://webchat.freenode.net/?channels=#cassandra" title="Connect to #cassandra using webchat">a web-based client</a>. |
| </p> |
| |
| <h3 class="hdr">Dead Trees</h3> |
| <ul class="nobullets"> |
| <li><a href="http://www.amazon.com/Cassandra-High-Availability-Robbie-Strickland/dp/1783989122">Cassandra High Availability</a>, by Robbie Strickland. Covers Cassandra 2.0</li> |
| </ul> |
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