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What is Cassandra?
CQL- Cassandra query language
- Masterless Architecture with read/write anywhere design
- Continuous availability with no single point of unsucess
- Multi data center and Zone support
- No SPOF
- Flexible data model for unstructure, semi structure and structured data
- Linear scalable performance with online expansion
- Security with integrated authentication
- Operationaly simple
- Written in Java
- High Performance
- Simple to operate
- Distributed and data center aware
- A ring has several nodes
- Each node is assigned a partition value.
- Data processing is based on the Partition Key.
- When a client makes a request to a node, it becomes the coordinator for that request
- The coordinator determines which node in the ring should process upon that request
Unique features Apache Cassandra
Data is distributed across the cluster.
There is no master node; every node can service any request.
Each node contains different data
|Supports replication and multiple data centre replication|
It has distrributed architecture.
It can support multiple data centres for disaster recovery, redundancy
|Scalability||Easily scalable to various machines without any downtime or interruption to any applications|
|Tunable consistency||It offers turable consistency for read and write operations.|
|Mapreduce support||It has Hadoop integration with support for mapreduce, apache pig and apache hive|
|Query language||It introduces cassandra query language|
Finding the Features of Cassandra online service to Cassandra Assignment Help:
1) Robust: Support UDTs, tuples and other complex types.
2) Easy to use: Expose collection data types using relational concepts and standards for existing applications.
3) Codeless Implementation: Optimize performance and compatibility with any application without application changes.
4) Compatible: Certified Data Direct Quality guarantees Apache Cassandra compatibility through explicit testing
5) Fast: Easily load large volumes of data without application code or additional tools that slow performance
Example: Creating Join Queries Using Cassandra
CREATE TABLE tbl_monthly (
PRIMARY KEY((station_id), metric, date)
CREATE TABLE tbl_station (
PRIMARY KEY (STATION_ID)