Cloud Design Patterns
Scalability :
Architecture that scale in a linear manner where adding extra resources results in at least a proportional increase in ability to serve additional load**.** There are generally two ways to scale an IT architecture: vertically and horizontally
Scaling Vertically :
Increasing the hardware capacity by stopping the instance and increase the capacity, Good for short term scaling. Not a good way to scaling for long shot because It has its limits and not always cost effective and reliable.
Horizontal Scaling :
Increase the number of resources, but not all architecture are capable of horizontal scaling or to distribute their workload to multiple resources. Bellow are some scenarios fro horizontal scaling.
Stateless Applications
- A stateless application is an application that needs no knowledge of previous interactions and stores no session information.
How to distribute load to multiple nodes
- Push model: Use load balancers or Route53(does not help every time).
- Pull model: Asynchronous event-driven workloads.
Statefull Applications:
- Databased are sate-full
Distributed Processing :
- Hadoop, AWS EMR.