NoSQL
Revised on: 4/13/2015 by Rushiagr
Contents
Summary
Openstack meant to be used in large public clouds. But rdbms becomes bottleneck in large-scale deployments. NoSQL world is designed for inifinite scalability, hardware failures, at the cost of some features of rdbmses (which might become unnecessary)
Why
RDBMSes: great features: strong consistency, normalization, joins, sorting, and many many more
Problems with RDBMS
Inherent limitations
1. Doesnt scale -- only vertical scalability 2. Not dc-aware 3. Prone to failures
Solutions to scale RDBMS
NoSQL
Linear scalability
DC-awareness
Robust and designed with failures in mind
Why Cassandra ?
TODO
- Also talk about ugly joins in sql, affecting performance?
- Also talk about this: nosql means no sort keys on any random column?
- ^^ in short, means that openstack already developed it's apis with an assumption that all backends are going to have those functionalities, which becomes false once we throw nosql in the mix. So such api's should be made optional/extensions? E.g. sort keys?
