{"id":16601,"date":"2021-09-22T16:27:01","date_gmt":"2021-09-22T10:57:01","guid":{"rendered":"http:\/\/ismiletechnologies.com\/?p=16601"},"modified":"2021-10-06T20:44:03","modified_gmt":"2021-10-06T15:14:03","slug":"an-overview-of-cassandra-architecture","status":"publish","type":"post","link":"https:\/\/ismiletechnologies.com\/en_us\/technology\/an-overview-of-cassandra-architecture\/","title":{"rendered":"An Overview of Cassandra Architecture"},"content":{"rendered":"\n

Apache Cassandra<\/strong>– a name synonymous with availability, reliability and scalability is a NoSQL database with a unique architecture. Let\u2019s delve a little deeper into what the architecture of Cassandra comprises of <\/p>\n\n\n\n

Cassandra clusters<\/strong> <\/p>\n\n\n\n

Cassandra has distributed system architecture. Each Cassandra instance<\/strong> (document confirming to a specific data type definition (DTD)) is called a node<\/strong>. You can add multiple nodes by horizontally scaling to form a cluster.<\/strong> A cluster is a shell in the entire Cassandra database <\/p>\n\n\n\n

\"An<\/figure>\n\n\n\n
\"An<\/figure>\n\n\n\n

( Nodes to clusters by horizontal scaling) <\/p>\n\n\n\n

Column<\/strong>– It is the innermost layer in the Apache Cassandra database. It is divided into different headings. The headings carry the primary data for the specific entry made <\/p>\n\n\n\n

Rows<\/strong>– It is the next layer and are basically classifications under which the columns are divided. <\/p>\n\n\n\n

Cassandra stores data in table and each table is grouped under columns and rows<\/strong> <\/p>\n\n\n\n

Structure of the table in Cassandra<\/strong> <\/p>\n\n\n\n

USE User_data; <\/p>\n\n\n\n

CREATE TABLE User_table ( <\/p>\n\n\n\n

     User_id int, <\/p>\n\n\n\n

     User_name text, <\/p>\n\n\n\n

     User_add text, <\/p>\n\n\n\n

     User_phone text, <\/p>\n\n\n\n

     PRIMARY KEY (User_id) <\/p>\n\n\n\n

); <\/p>\n\n\n\n

Insert into User_data (User_id, User_name, User_add, User_phone )  <\/p>\n\n\n\n

                    VALUES(100, \u2018P\u2019, \u2018San Jose\u2019, \u20189899112453\u2019); <\/p>\n\n\n\n

Insert into User_data (User_id, User_name, User_add, User_phone )  <\/p>\n\n\n\n

                        VALUES(101, \u2018P Maz\u2019, \u2018Alameda\u2019); <\/p>\n\n\n\n

OUTPUT<\/strong> <\/p>\n\n\n\n

\"An<\/figure>\n\n\n\n

Key space<\/strong>– The key space is the outermost layer in the storage. It contains the main data, distributed according to their properties. <\/p>\n\n\n\n

\"An<\/figure>\n\n\n\n

A cluster is the main entry point of the data into the Cassandra database.<\/strong> <\/p>\n\n\n\n

Each node in Cassandra is capable of performing the entire database operations and deal with client requests individually without requiring any master node. The cluster doesn\u2019t hold a single point of failure owing to the distributed nature of architecture.<\/strong> <\/p>\n\n\n\n

One or more nodes in the cluster serve as replicas for the set of data. With data replication among the nodes, Cassandra ensures no single point of failure <\/p>\n\n\n\n

\"An<\/figure>\n\n\n\n

The cluster nodes communicate with each other through Gossip<\/strong> protocol. Gossip keeps one node apprised of the status of other nodes. Every second, one node gossips with three other nodes in the cluster. <\/p>\n\n\n\n

A cluster in Cassandra is divided into racks (group of metal servers collaborating resources like network switches and power source) and data centers<\/strong>. Snitch configuration<\/strong> is used to group nodes into racks and data centers. Data replication depends on the configuration of racks and data centers.  <\/p>\n\n\n\n

\"An<\/figure>\n\n\n\n

Storage in Cassandra<\/strong> <\/p>\n\n\n\n

Commit Log-<\/strong> It\u2019s the crash recovery mechanism of Cassandra or to sync issues with the server on failure of the data node. All write operations are written to commit log. <\/p>\n\n\n\n

Mem-table<\/strong>– After commit log the data is written to the Mem-table <\/p>\n\n\n\n

SS table-<\/strong> When the contents of the Mem-table reach a threshold value, the data is flushed from it to a disk file called the SS- table <\/p>\n\n\n\n

\"An<\/figure>\n\n\n\n

Data Replication in Cassandra<\/strong> <\/p>\n\n\n\n

Every data entry item in the table is replicated at M hosts where M is the configured replication factor at each instance <\/p>\n\n\n\n

I hope that I have been able to outline the architecture of Apache Cassandra.  <\/p>\n\n\n\n

Comment or write to us.\u00a0<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

Apache Cassandra– a name synonymous with availability, reliability and scalability is a NoSQL database with a unique architecture. Let\u2019s delve a little deeper into what the architecture of Cassandra comprises of  Cassandra clusters  Cassandra has distributed system architecture. Each Cassandra instance (document confirming to a specific data type definition (DTD)) is called a node. You can add multiple […]<\/p>\n","protected":false},"author":3,"featured_media":16809,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[19],"tags":[],"class_list":["post-16601","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technology"],"_links":{"self":[{"href":"https:\/\/ismiletechnologies.com\/en_us\/wp-json\/wp\/v2\/posts\/16601","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ismiletechnologies.com\/en_us\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ismiletechnologies.com\/en_us\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ismiletechnologies.com\/en_us\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/ismiletechnologies.com\/en_us\/wp-json\/wp\/v2\/comments?post=16601"}],"version-history":[{"count":4,"href":"https:\/\/ismiletechnologies.com\/en_us\/wp-json\/wp\/v2\/posts\/16601\/revisions"}],"predecessor-version":[{"id":18317,"href":"https:\/\/ismiletechnologies.com\/en_us\/wp-json\/wp\/v2\/posts\/16601\/revisions\/18317"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ismiletechnologies.com\/en_us\/wp-json\/wp\/v2\/media\/16809"}],"wp:attachment":[{"href":"https:\/\/ismiletechnologies.com\/en_us\/wp-json\/wp\/v2\/media?parent=16601"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ismiletechnologies.com\/en_us\/wp-json\/wp\/v2\/categories?post=16601"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ismiletechnologies.com\/en_us\/wp-json\/wp\/v2\/tags?post=16601"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}