The simplest database deployments are run as a single instance on a single server. Other widely used implementations of Dynamo include Riak and Voldemort. Note: Cassandra is one of the several popular distributed databases inspired by the Dynamo architecture, originally published in a paper by Amazon. When new machines join the cluster, Cassandra takes care of rebalancing the existing data so that each node in the expanded cluster has a roughly equal share. The result is that Cassandra deployments have an almost limitless capacity to store and process data when additional capacity is required, more machines can simply be added to the cluster. Instead, data can be read or written to any instance in the cluster, referred to as a node this node will forward the request to the instance where the data actually belongs.
From the client application’s standpoint, the cluster is a single entity the application need not know, nor care, which machines a piece of data belongs to. Enthusiastic about exploring the skill set of Cassandra? Then, have a look at the Cassandra Online Training Course together with additional knowledge.Ĭassandra, on the other hand, is deployed as a cluster of instances that are all aware of each other. Your application bears responsibility for knowing to which instance a given piece of data belongs. If the data set outgrows this capacity, and a more powerful server isn’t available, the data set must be shared among multiple independent database instances that know nothing of each other. A traditional single-master database’s storage capacity is limited by the capacity of the server that hosts the master instance. Horizontal scalability refers to the ability to expand the storage and processing capacity of a database by adding more servers to a database cluster. What follows is an overview of several desirable database capabilities, with accompanying discussions of what Cassandra has to offer in each category. Compared with other popular distributed databases like Riak, HBase, and Voldemort, Cassandra offers a uniquely robust and expressive interface for modeling and querying data.
#Cassandra database professional
This tutorial gives you an overview and talks about the fundamentals of Apache Cassandra. we will start from the basics of Cassandra and learn all the major Cassandra concepts that a Cassandra professional must be aware of.
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