📝 Parottasalna Blog
249 practical articles on backend engineering, system design, databases, Docker, Python, AI and DSA, explained simply.
Docker Cookbook
List all images ? docker images List all containers ? docker container ls -a / docker ps -a List all containers belong to a particular image ? docker…
CodingCode Smell : Anemic Model / Data Class
Problem faced: During our software development, we used to use design a class just to use it as a data structure. But while i was interested in readi…
DockerTipsCOPY or ADD in DOCKERfile ?
While i was reading on the best practices of writing a Dockerfile, its mentioned that COPY is preferred than ADD. The COPY and ADD commands in Docker…
Load BalancingWhy do we need to maintain same hash in load balancer ?
Introduction Have you ever thought of what is that ? when developers discuss like add a server; we need to scale up; we can scale down; implement a l…
API DesignCan we use PUT in place of IDEMPOTENT POST ?
Consider we have created an idempotent post request. So now the functionalities of PUT and POST are similar. So is it okay to use PUT inplace for POS…
ProgrammingCan we use database as queue in asynchronous process ?
When reading about kafka, rabbitmq or any brokers; this is the thought that comes to my mind. Why can’t we simply use a database ? This post deals wi…
RedisREDIS: WRITE BEHIND CACHE
Note: Its same as write through cache . Only difference is its asynchronous in inserting the values to mongodb. Its an Application level caching, whe…
RedisREDIS: WRITE THROUGH CACHE
Its an Application level caching, where the application writes the data directly to the redis; and redis will write to the primary db (mongodb in our…
DevelopmentHow npm Install and npm CI works ?
Prerequisite: https://parottasalna.com/2024/06/12/contents-of-package-json-package-lock-json/ How does npm install work? So far we have seen the func…
ProgrammingContents of package.json & package-lock.json ?
If you work in web development, you likely use NPM (Node PM or New PM) all the time. It is a free public software registry – the largest in the world…
Web DevelopmentServer Sent Events : An real time unidirectional communication
While you are developing real-time projects, there is always a one-question mark on “ how to get real time updates from server ? ”. There are differe…
TechnologyHow reed solomon error correction algorithm makes a damaged QR code to work fine ?
Amused At Due to fever and cold i went to Ayurvedic medicine store. During the payment , i asked him QR code for digital payment. The QR code sheet i…