WebSockets is essentially a transport layer built on the top of the TCP/IP Protocol. and provides a persistent bidirectional communication channel between a client and a server. The initial connection is established similar to a normal HTTP request and then upgraded to a lightweight and real-time bidirectional channel which

A key aspect of any Large scale system is the ability to handle a large amount of Data. A Database is used to persist information that will be useful later on. Broadly there are two types of database categories available to store the data and those are SQL or NoSQL.

Scaling means increasing the system capacity to cope up with increased load for example number of requests or handling more data. Need for Scaling If our system is currently handling 100 requests/min and suddenly the traffic increases to 1000 requests/min, even though our system might be able to

NoSQL Database refers to Non Relational database, In contrast to a relational database where data is stored in well defined tabular relations and Structured Query Language is used to access data, NoSQL database uses different mechanisms for storage and retrieval and generally does not provide SQL based data access and

Messaging System is a common approach to transfer data between systems and applications. A producer generates a message containing some information that is transmitted to the consumers. We can do this via direct communication via TCP connection between producer and consumer. However, such a system allows communication between exactly one

Load Balancing means efficiently distributing the network traffic across multiple machines to balance out the load and prevent any hotspots. Load Balancers also keep track of servers which are not functional and avoid sending requests to those machines. When the server comes back up or new servers are added, Load

It’s a network of servers that are distributed geographically and deliver content at fast speeds. It gives quick transfer of static content like files(HTML, js, text, etc.), images, and videos. CDN plays a vital role in designing modern web applications and serves a majority of web traffic in

Caching means storing data into the cache, which is a high-speed low latency data storage. It will store a limited amount of information, that is very likely to be used in the immediate future. Caching layer typically stores the data in memory (or RAM) and hence avoids accessing the secondary

ACID ACID is an acronym for Atomicity, Consistency, Isolation, and Durability coined by Andreas Reuter and Theo Härder as a set of properties of database transactions that every database storage engine should strive for. ACID compliance guarantees the validity of data in events of errors, hardware, or power failures. Atomicity