This course immerses the learner into the design of systems and makes them ready for any new design problems.

sys-design.tar.gz

basic

This course provides an alternate perspective to system design where we learn about building blocs first and then use them to build bigger, more capable systems.

Copy-System Design-The Missing Pieces

# Fulfilling requirements

Our non-functional requirements for the proposed newsfeed system design are scalability, fault tolerance, availability, and low latency. Let's discuss one by one how the proposed system fulfills these requirements.

1. **Scalability:** The proposed system is scalable to handle an ever-increasing number of users. The required resources, including load balancers, web servers, and other relevant servers, are added/removed on demand.   

2. **Fault tolerance:** The replication of data consisting of users' metadata, posts, and newsfeed makes the system fault-tolerant. 
. Moreover, the redundant resources are always there to handle the failure of a server or its component. 

3. **Availability:** The system is highly available by providing redundant servers and replicating data on them. When a user gets disconnected due to some fault in the server, the session is re-created via a load balancer with a different server. Moreover, the data (users metadata, posts, and newsfeeds) is stored on different and redundant database clusters, which provides high availability and durability.

4. **Low latency:** There are various levels at which we minimize the system's latency.
   * Through geographically distributed servers and the cache associated with them. This way, we bring the service close to users.  

   * Using CDNs for frequently accessed newsfeeds and media content.     
  
 



Evaluate the newsfeed design with respect to its non-functional requirements. 

Evaluation of the Newsfeed System

Evaluate the newsfeed design with respect to its non-functional requirements.