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{"id":409,"date":"2021-07-13T04:40:35","date_gmt":"2021-07-13T04:40:35","guid":{"rendered":"https:\/\/www.wikitechy.com\/interview-questions\/?p=409"},"modified":"2021-09-13T11:46:51","modified_gmt":"2021-09-13T11:46:51","slug":"what-is-cassandra-database-software","status":"publish","type":"post","link":"https:\/\/www.wikitechy.com\/interview-questions\/cassandra\/what-is-cassandra-database-software\/","title":{"rendered":"What is Cassandra database software ?"},"content":{"rendered":"<div class=\"TextHeading\">\n<div class=\"hddn\">\n<h2 id=\"cassandra-database-software\" class=\"color-purple\" style=\"text-align: justify;\">Cassandra database software<\/h2>\n<\/div>\n<\/div>\n<div class=\"Content\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<ul>\n<li>Apache Cassandra is a simple and open-source provides NoSQL DBMS build to handle huge volume of data against more fabric servers.It providing high availability with no single point of failure.<\/li>\n<li>The performance of Cassandra place a high value. In 2012, University of Toronto researchers studying NoSQL systems resulted that &#8220;Scalability defined there is a clear winner throughout our experiments.Cassandra achieves the largest throughput for the large number of nodes in all experiments&#8221; although &#8220;it determine at the price of high write and read latencies.&#8221;<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div class=\"ImageContent\" style=\"text-align: justify;\">\n<div class=\"hddn\"><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter size-medium\" src=\"https:\/\/cdn.wikitechy.com\/interview-questions\/cassandra\/cap-theorem.gif\" alt=\"cap theorem\" width=\"581\" height=\"307\" \/><\/div>\n<\/div>\n<h2 id=\"main-features\" style=\"text-align: justify;\">Main features:<\/h2>\n<div class=\"TextHeading\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<h2 id=\"decentralized\" class=\"color-purple\">Decentralized<\/h2>\n<\/div>\n<\/div>\n<div class=\"Content\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<ul>\n<li>Cluster contain every node has the same role.<\/li>\n<li>There is no single point of failure.<\/li>\n<li>To provides data across the cluster so every node have various data, but there is no master as every node can service if any request.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div class=\"text-center row\" style=\"text-align: justify;\"><\/div>\n<div class=\"TextHeading\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<h2 id=\"supports-replication-and-multi-data-center-replication\" class=\"color-purple\">Supports replication and multi data center replication:<\/h2>\n<\/div>\n<\/div>\n<div class=\"Content\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<ul>\n<li>Replication strategies are configurable.<\/li>\n<li>Cassandra is built as a distributed system, for deployment of maximum numbers of nodes across many data centers.<\/li>\n<li>Key features of Cassandra\u2019s distributed architecture are specifically change for multiple-data center deployment, for redundancy, for fail over and disaster recovery.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div class=\"TextHeading\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<h2 id=\"scalability\" class=\"color-purple\">Scalability:<\/h2>\n<\/div>\n<\/div>\n<div class=\"Content\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<ul>\n<li>As new machines are added read and write throughput both increase linearly, with the achieve of no halt or interrupt to applications.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div class=\"TextHeading\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<h2 id=\"fault-tolerant\" class=\"color-purple\">Fault-tolerant<\/h2>\n<\/div>\n<\/div>\n<div class=\"Content\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<ul>\n<li>Data is automatically replicated to many nodes for fault-tolerance. Replication across multiple data centers is maintained. Failed nodes can be changed with no downtime.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div class=\"ImageContent\" style=\"text-align: justify;\">\n<div class=\"hddn\"><img decoding=\"async\" class=\"aligncenter size-medium\" src=\"https:\/\/cdn.wikitechy.com\/interview-questions\/cassandra\/cassandra.gif\" alt=\"cassandra\" width=\"508\" height=\"291\" \/><\/div>\n<\/div>\n<div class=\"TextHeading\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<h2 id=\"tunable-consistency\" class=\"color-purple\">Tunable consistency<\/h2>\n<\/div>\n<\/div>\n<div class=\"Content\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<ul>\n<li>Writes and reads gives a adjustable level of consistency, all the way from &#8220;writes never fail&#8221; to &#8220;block for all replicas to be readable&#8221;, with the quorum level in the middle.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div class=\"TextHeading\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<h2 id=\"mapreduce-support\" class=\"color-purple\">MapReduce support<\/h2>\n<\/div>\n<\/div>\n<div class=\"Content\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<ul>\n<li>Cassandra has Hadoop integration, with MapReduce support.<\/li>\n<li>There is support also for Apache Pig and Apache Hive.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div class=\"ImageContent\">\n<div class=\"hddn\" style=\"text-align: justify;\"><img decoding=\"async\" class=\"aligncenter size-medium\" src=\"https:\/\/cdn.wikitechy.com\/interview-questions\/cassandra\/apache-cassandra.png\" alt=\"apache cassandra\" width=\"555\" height=\"516\" \/><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Answer : Apache Cassandra is a simple and open-source provides NoSQL DBMS build to handle huge volume of data against more fabric 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