Questions tagged [microservices]
Microservices are small, independent processes that communicate with each other to form complex applications which utilize language-agnostic APIs. These services are small building blocks, highly decoupled and focused on doing a small task, facilitating a modular approach to system-building.
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Data change event publishing by microservice vs separate application - best practice
Suppose there is a microservice that has an restful HTTP API for CRUD operations on a database - nothing fancy, but there is a journal table of all changes recorded for audit purposes.
Suppose also ...
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30 views
Event-based communication between microservices
I'm currently looking into NestJS to use as the framework for a new e-commerce project. The goal is to build multiple loosely-coupled services, which can communicate with each other using the pub/sub ...
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Gateway aggregation is only for microservices?
I started to work in an existing Angular app that consumes a monolithic Web API writen with .NET CORE. This API has dozens of controllers(routes).
In one of the main screens, when one specific event ...
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1answer
39 views
Flask restful file upload asynchronously?
I am working on converting an existing python based monolith solution to a microservice. The current flow is pretty straight forward:
Accept XLSX as input -> Run some complex algorithms based on ...
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2answers
119 views
how to build microservices that also have GUIs
In a microservices architecture where each component does one thing, how do you handle GUI logic? How do you avoid building a front end web application that has a lot of smarts built into it where it ...
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1answer
67 views
Design decision of reading XLSX file at once or intermittently
I am working on converting an existing python based monolith solution to a microservice. The current flow is pretty straight forward:
Accept XLSX as input -> Run some complex algorithms based on ...
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0answers
26 views
How to implement a saga execution coordinator in node.js for orchestration based saga of microservices? [closed]
All of my services are written in nodejs. I want to create a saga execution coordinator (SEC) for my services, which I want to be in nodejs also. I have no idea how do I implement this.
I'd like to ...
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1answer
89 views
If I use the same database (Redis container) for all microservices, will that be an acceptable design without deviating from microservice principles?
I am working on converting a milestone project into microservices. All these services are in seperate docker containers. I am using event-driven pattern where I have used RabbitMQ as the message ...
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2answers
68 views
Can a service be split into two microservices using common libraries?
I am thinking of splitting a service serving multiple endpoints into microservices that can serve a set of endpoints but the problem is that the two services have certain logic in common. can the two ...
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1answer
68 views
How microservices db are updated and sync when scale? [closed]
Scenario:
In Case I have MS "MS-1"
Orchestration detect high volume
Orchestration create additional node with cloned MS "MS-2"
"MS-2" get request and update its DB
Question :
How MS "MS-1" will ...
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4answers
257 views
Should we share a database between two 'Microservices'?
We're implementing a service that exposes data related to a particular part of a business. It will pull data in from different sources, do some ETL, and store it in Redis. It will expose this data ...
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4answers
191 views
Is it better for a microservice to access database tables individually or to work with joined data?
In my limited understanding of microservices they seem to focus on quite limited pools of information, leaving it up to the application to bring all the data together in ways which were perhaps not ...
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2answers
114 views
Data from one microservice to another
How does one service get the data from another service? I will give few examples:
1) Let's say we have two services which need to share the data: User Service and Order Service. Order Service pretty ...
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1answer
30 views
building a frontend for a microservice backend: architectures? (spring boot stack)
to summarize a bit my current situation: I am building a backend based on microservices using spring boot.
These are aggregated behind an api-gateway.
My intention is to consume these api's from both ...
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1answer
32 views
Scheduled AWS Lambda to Update Database via API Call
I'm planning on the following for a use case scenario for AWS Lambda and want to make sure I'm headed in the right direction and that there's not some better/easier solution out there.
The database ...
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0answers
25 views
Microservices: Changing DB Usernames at Runtime and Carrying Session Settings Across Other Services
Currently, our database is a shared database separate schema. Under the current architecture, all users start at the entry schema, which we called as APP, before the identity of the user (upon ...
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3answers
374 views
Microservices - What does it mean to deploy & upgrade independently?
In this article, it is mentioned (emphasis mine):
...the microservice architectural style is an approach to developing a
single application as a suite of small services, each running in its
own ...
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38 views
best way to get history for a MicroService
I'll shortly describe a part of a system that is monitoring and detecting a specific change.
mon-service : actively poll value from the source and publish changes
log-service : listen to changes and ...
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1answer
82 views
Authentication and Signup with Microservices
I am looking for the best practice to do authentication (login) and signup using microservices, given that microservices are not supposed to share the same data.
At the moment I am thinking:
Two ...
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1answer
27 views
Dynamic Configuration vs. Custom Service
I have been designing an email alert system for my customers which allows them to choose what alerts they receive. AlertManager seems suitable, except for it's static configuration file; A customer ...
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1answer
45 views
Sharing data between services in events based architecture
We currently have a monolithic application. Currently an API end-point will look something like:
public async Task<IActionResult> Post([FromBody]ContactViewModel model) {
//... update the ...
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2answers
95 views
Microservices architecture: Divide micro services by user roles alone
I have encountered the following design requirement in an app marketplace like project from a client in which users can rate games/apps they download (only in a special way more helpful than ...
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2answers
42 views
Aggregating data between microservices in twitter-like application
I'm developing a Twitter-like app and I have some doubts about my service oriented architecture.
I have a User Service with a REST endpoint POST /users/{userId}/follow
so the "connected" user starts ...
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1answer
101 views
How to identify rules satisfying a certain condition based on events
I am working on a microservice, in an event driven world, where I have tens of 1000s of rules configured which depend on data type A, B, C, D and so on.
As soon as an event arrives I want to be able ...
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1answer
72 views
How could I programmatically generate a chart of interservice messaging flows before runtime?
My team is currently developing an application using a microservice architecture with publish/subscribe interservice communication over a message bus. Certain types of HTTP requests and messages ...
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1answer
65 views
Background job in microservices
I have a basic java Dropwizard service within cluster of microservices. It manages user resources with restful api styles. Let's call it user-app Then there is a new operation / api endpoint that ...
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What is the best practice when it comes to naming microservice endpoints?
With a monolith we have one huge api project for which we used plural nouns to represent each entity. For example http://monolith.domain.com/Payments, http://monolith.domain.com/Customers, http://...
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1answer
41 views
Is event-sourcing and event-driven design works in scalable architecture for a wallet?
considering you need to design a simple wallet service that keep tracks of transactions, and give balance for each account.
I started designing the solution using event-driven architecture, so every ...
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1answer
132 views
How to develop independent logical blocks without having too many microservices?
I have a service which is composed of various independent small "blocks" of logical code.
A block stands for a class which implements an interface "IBlock" which includes an "Execute" function that ...
1
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1answer
21 views
Event Carried State Transfer and initial state synchronization
I'm exploring Event Carried State Transfer patter, I understand how it works, but there is one problem I don't know how to solve.
So, in ECST, a service can listen to events and then build a private ...
2
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1answer
61 views
Should I use Repositories or wrap that logic in an additional service layer in my Controllers
I am building a Loopback4 app just for learning;
I have a scenario where I have to check for a couple of things before sending that request to the database, so my entry point is my Controllers Method, ...
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2answers
33 views
Normalising pagination regardless of the target source
I have a service that fetches data from a target source (not through an API but via scraping) which can change. I want to do pagination so that I return 35 items per page but the target source is 25 ...
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0answers
23 views
Error code handling between Oracle Database and Microservice API
I'm using Oracle Database and .Net Core API for my project.
What is the best way / best practice of handling errors between Database and API?
What I'm thinking is, I'll return only custom error ...
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4answers
158 views
Design Idea to Overcome Slow DB (a black box) Access
Suppose we have a DB with a table holding
Person:
id
first name
last name
age
The DB is a black box. And there are a lot of get and post requests for these records. We cannot change the DB but ...
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2answers
94 views
How to send queue messages to one queue in rabbitmq?
I want to use rabbitmq to share domains events between microservices. Due to the fact that queues are round-robin, I need to define one queue per event source and event consumer.
For example, cars-ms ...
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1answer
72 views
Should microservices manage their own media file logics?
I've heard that when you designing a microservice, the service should includes everything it needs to make them loose coupling instead of calling each other (services).
Based on this idea, should ...
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1answer
166 views
At what point does a microservices architecture become “worth it” vs. a monolithic ASP.NET web application?
I'm the maintainer of an ASP.NET WebForms application and am contemplating a refresh of the application in order to eliminate dependency on some legacy libraries, add some features, fix some areas ...
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2answers
74 views
Looking for clarification on pub/sub systems and how an API gateway comes into play
I'm new to micro service architecture and I'm looking to understand how services should/can interact with each other.
The acceptance for my current story requires me to:
Email a document
Backup the ...
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3answers
269 views
Does each microservice need its own server running (Tomcat, docker container)
In development I have a Java backend API which I'm running with Tomcat. I'm wanting to wrap the backend in a docker container and deploy to an AWS EC2 instance, and be able to scale up/down.
Does ...
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2answers
72 views
Possible microservice based design
Here are the design considerations for a software.
The querying of data should be as fast as possible (reader <1s, writer <2.5s possibly since it also take time to reach the client end web or ...
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1answer
75 views
Why should an authentication server and a gateway be two distinct components?
Why should I decouple an authentication server from a gateway in a micro services architecture ?
A clear drawback is the additional network load needed to query the auth server in each request.
...
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0answers
21 views
Common ordering patterns for several instances of a microservice and one DB in eventual consistency [duplicate]
i was wondering - when we're talking about microservices communication, one common pattern is "eventual consistency":
https://docs.microsoft.com/en-us/dotnet/architecture/microservices/architect-...
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2answers
156 views
Direct Service Calls vs API Gateway For Microservice Communication
I've such microservice architecture as below. I want execution service to get some information from storage and assignment services. I want to use MVC App like an API Gateway and handle all ...
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1answer
53 views
Do I need multiple exception classes for a Micro Service
I am developing a Micro Service which is going to be called/used internally. I'm trying to improve error handling, but got confused with two below approaches.
Having multiple exception classes for ...
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2answers
87 views
Http Status Code When Downstream Validation Fails
I have an API that charges for an order. It accepts the orderId and the amount as inputs. Then it makes a '/charge' call to the downstream, which returns a 202. Immediately after this call, it calls a ...
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3answers
148 views
Multiple Databases per Microservice
We have a scenario in which all the important and transactional fields of our business entities are highly structured and relational. The data size of these important fields is also very small. ...
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1answer
214 views
How do sites like LeetCode & HackerRank test your code for correctness?
Not sure if this question belongs here, but I've always wondered how exactly sites like Leetcode & HackerRank test your code. Say you code in Java for a question like,
Find all the duplicates in ...
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1answer
140 views
Saga vs. Unit of work
What's the relationship between the two?
Both are for atomic operations. Both results need to be either success, or failure with rollback to original state.
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1answer
103 views
Multitenancy - Tenant provider in microservices architecture
We are now in a process of migrating our server-per-client architecture to a multi-tenancy architecture.
Everything is in place except for one design issue we are having.
We are using a subdomain in ...
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2answers
99 views
How should I design an architecture for an endpoint to take in huge amount of data without loading the database?
Every day, there will be a set of new data that I will need to write and update to the database. This set of data can contain 8-10million records.
This new set of data comes from Service A and it ...
