Given the diagram from Alexu Book of designing Rate-limiter. I am wondering how the 2 way communication between Redis and rate limiter will take place. The 2 way communication has been shown using double arrow in the diagram between Redis…
My team is trying to design an event-driven microservice architecture that allow an end-user to select a subscription type (e.g: Pro, Enterprise) from our website and buy max 5 licenses for that subscription. The payments and checkout administration will be…
I am working on a system using JPA where Entity 'Events' are associated with Entity 'Groups' and each Group has five boolean columns (Group1, Group2...) indicating their attendance status for an event. Now, I need to enhance the system by…
I need someone expert advice here. For my chat application, I'm using MYSQL. As I have structured messages so I chose mysql. Now My concern is about the scalibility and throughput. I spent time analizing DynamoDB in terms of scalibility…
Let's say I have a message producer, which sends a very high number of messages with versions V1, V2, ..., VN, in a short timespan. We have a service, which is not required to react to every such message. We…
I have setup celery, rabbitmq and django web server on digitalocean. RabbitMQ runs on another server where my Django app is not running. When I am trying to add the tasks to the queue using delay I am getting an…
Given a pipeline of tasks that run in sequence. Each task consumes data from the database, manipulate it, and produces (write) to the same database. We are using AWS RDS Aurora, and in order to spread the load, the “reading…
I am developing an application where there is a dashboard for data insights. The backend is a set of microservices written in NodeJS express framework, with MySQL backend. The pattern used is the Database-Per-Service pattern, with a message broker in…
I'm trying to design a page that supports infinite scroll. There is 1 important feature that we definitely want this to support: we want to be able to update the already loaded items if an item is changed/deleted. For example,…
Let's suppose we have a fairly large database of products for e.g. 50 K Mobile Phone. We store these data in Elastic Search. Now I have a Product Listing page for mobile phone, there I list all mobile 10 at…