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| title: "Apache Cassandra" |
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| <h3>What is Cassandra?</h3> |
| <p class="lead"> |
| 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. |
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| <h4>Proven</h4> |
| <p> |
| Cassandra is in use at |
| <a href="https://www.dataversity.net/case-study-cassandra-meets-call-of-duty/">Activision</a>, |
| <a href="https://www.techrepublic.com/article/apples-secret-nosql-sauce-includes-a-hefty-dose-of-cassandra/">Apple</a>, |
| <a href="https://www.youtube.com/watch?v=5jKZUnkhB50">BazaarVoice</a>, |
| <a href="https://www.slideshare.net/joelcrabb/cassandra-and-riak-at-bestbuycom">Best Buy</a>, |
| CERN, |
| <a href="http://www.slideshare.net/daveconnors/cassandra-puppet-scaling-data-at-15-per-month">Constant Contact</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>, |
| Fidelity, |
| Github, |
| <a href="https://www.nexttv.com/news/hulu-scales-user-database-apache-cassandra-133429">Hulu</a>, |
| <a href="https://ithome.com.tw/video/103028">ING</a>, |
| <a href="https://instagram-engineering.com/open-sourcing-a-10x-reduction-in-apache-cassandra-tail-latency-d64f86b43589">Instagram</a>, |
| <a href="https://www.datastax.com/resources/video/datastax-accelerate-2019-managing-400-billion-requests-zero-downtime-turbotax">Intuit</a>, |
| <a href="https://www.slideshare.net/planetcassandra/apache-cassandra-at-macys">Macy's™</a>, |
| <a href="https://diginomica.com/macquarie-banks-on-customer-appetite-for-a-spotify-like-experience">Macquarie Bank</a>, |
| Microsoft, |
| McDonalds, |
| <a href="https://www.slideshare.net/VinayKumarChella/how-netflix-manages-petabyte-scale-apache-cassandra-in-the-cloud">Netflix</a>, |
| <a href="https://www.slideshare.net/planetcassandra/michael-laing-nyt-developers1">New York Times</a>, |
| Outbrain, |
| Pearson Education, |
| <a href="https://www.slideshare.net/OliverLockwood1/apache-cassandra-building-a-production-app-on-an-eventuallyconsistent-db">Sky</a>, |
| <a href="https://engineering.atspotify.com/2015/01/09/personalization-at-spotify-using-cassandra/">Spotify</a>, |
| <a href="http://highscalability.com/blog/2016/9/28/how-uber-manages-a-million-writes-per-second-using-mesos-and.html">Uber</a>, |
| <a href="https://medium.com/walmartlabs/how-we-build-a-robust-analytics-platform-using-spark-kafka-and-cassandra-lambda-architecture-70c2d1bc8981">Walmart</a>, |
| and thousands of other companies that have large, active data sets. In fact, Cassandra is used by 40% of the Fortune 100.</p> |
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| <h4>Fault tolerant</h4> |
| <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> |
| </div> |
| |
| <div class="col-md-2 col-sm-2 feature-item"> |
| <h4>Performant</h4> |
| <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 real applications, |
| primarily because of <a href="https://www.datastax.com/blog/2013/01/2012-review-performance">fundamental architectural choices</a>. |
| </p> |
| </div> |
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| <h4>Decentralized</h4> |
| <p> |
| There are no single points of failure. There are no network bottlenecks. Every node in the cluster is |
| identical. |
| </p> |
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| <h4>Scalable</h4> |
| <p> |
| Some of the largest production deployments include Apple's, with over 75,000 nodes storing over 10 PB of data, |
| Netflix (2,500 nodes, 420 TB, over 1 trillion requests per day), Chinese search engine Easou (270 nodes, 300 TB, |
| over 800 million requests per day), and eBay (over 100 nodes, 250 TB). |
| </p> |
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| <h4>Durable</h4> |
| <p> |
| Cassandra is <a href="https://cassandra.apache.org/doc/latest/architecture/guarantees.html#durability1">suitable for applications that can't afford to lose data</a>, |
| even when an entire data center goes down. |
| </p> |
| </div> |
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| <h4>You're in control</h4> |
| <p> |
| Choose between synchronous or asynchronous replication for each update. Highly available asynchronous operations are |
| optimized with features like <a href="https://cassandra.apache.org/doc/latest/operating/hints.html">Hinted Handoff</a> and |
| <a href="https://cassandra.apache.org/doc/latest/operating/read_repair.html">Read Repair</a>.</p> |
| </p> |
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| <h4>Elastic</h4> |
| <p> |
| Read and write throughput both increase linearly as new machines are added, with no downtime or interruption |
| to applications. |
| </p> |
| </div> |
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| <h4>Professionally Supported</h4> |
| <p> |
| Cassandra support contracts and services are available from <a href="https://cassandra.apache.org/third-party/">third parties</a>. |
| </p> |
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