[[NutanixTerms]]

* Apache Cassandra: [#q5d4848a]
-Reference:http://cassandra.apache.org/
-Reference:[[Cassandra at NoSql Matters 2012 from jbellis>http://www.slideshare.net/jbellis/cassandra-at-nosql-matters-2012]],&ref("Terms/ApacheCassandra/nosqlmatters2012-130102154135-phpapp01.pdf","pdf");
-Reference:[[Apache Cassandra Architecture Overview(J Ellis OSCON 09 presentation).>http://wiki.apache.org/cassandra/ArchitectureOverview]],&ref("Terms/ApacheCassandra/Cassandra_A_Decentralized_Structured_Storage_System.pdf","pdf");
-Reference:[[DataStaxWhitePaper>http://www.datastax.com/wp-content/uploads/2012/08/WP-IntrotoCassandra.pdf]],&ref("Terms/ApacheCassandra/WP-IntrotoCassandra.pdf ","pdf");
-Reference:[[DataStaxWhitePaper>http://www.datastax.com/wp-content/uploads/2012/08/WP-IntrotoCassandra.pdf]],&ref("Terms/ApacheCassandra/WP-IntrotoCassandra.pdf","pdf");

*Welcome to Apache Cassandra [#g9d2cbb7]
The Apache Cassandra database is the right choice when you need scalability and high availability without compromising performance. Linear scalability 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.

Cassandra's data model offers the convenience of column indexes with the performance of log-structured updates, strong support for denormalization and materialized views, and powerful built-in caching.

>apache Cassandra databaseは、性能面で妥協することなくスケーラビリティ(拡張性)と高信頼性を実現する。リニア・スケーラビリティと,一般商品化されたハードウェア或いはクラウド・インフラストラクチャ上で証明されたフォールトレランス性は,ミッションクリティカルデータ用途での完全なプラットフォームとなる。Cassandraがサポートする、複数のデータセンター間を跨ったデータの複製は 最高クラスの製品であり、低遅延と地域的な災害発生時に於いても生存可能であると云う安心感を提供する。

>Cassandraのデータ モデルは、log-structured updateによる性能、denormalizationとmaterialized viewのサポート、&br;
強力なbuilt-in cache等を伴った[[column index(CQL)>http://www.datastax.com/documentation/cql/3.0/cql/aboutCQL.html]]の利便性を提供する。

*証明済 [#db899a7f]

Cassandra is in use at Constant Contact, CERN, Comcast, eBay, GitHub, GoDaddy, Hulu, Instagram, Intuit, Netflix, Reddit, The Weather Channel, and over 1500 more companies that have large, active data sets.

One of the largest production deployments consists of over 15,000 nodes storing over 4 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).

*Fault Tolerant [#zae06176]
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.

*Performant [#qdeaecb5]
Cassandra consistently outperforms popular NoSQL alternatives in benchmarks and real applications, primarily because of fundamental architectural choices.

*Decentralized [#f0a5e5f7]
There are no single points of failure. There are no network bottlenecks. Every node in the cluster is identical.

*Durable [#n648bc10]
Cassandra is suitable for applications that can't afford to lose data, even when an entire data center goes down.

You're in Control
Choose between synchronous or asynchronous replication for each update. Highly available asynchronous operations are optimized with features like Hinted Handoff and Read Repair.

*Elastic [#h8315a73]
Read and write throughput both increase linearly as new machines are added, with no downtime or interruption to applications.

*Professionally Supported [#j3b7dcdf]
Cassandra support contracts and services are available from third parties.


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