Concurrent requests Flask python

Question

I have some Flask application. It works with some database, I'm using SQLAlchemy for this. So I have one question:

Flask handle requests one-by-one. So, for example, I have two users, which are modifying the same record in the table of database, for example A and B (they are concurrent).

How can I say to user B that user A has changed this record? It must be some message to user B.

Welcome to Stackoverflow! Please post a minimal, Complete, and Verifiable example, so that we can help you. — jhoepken
– jhoepken, Commented Nov 13, 2016 at 10:37

Rohin Gopalakrishnan · Accepted Answer · 2016-11-13 11:05:47Z

2

In the development server version, when you do app.run(), you get a single synchronous process, which means at most 1 requests being processed at a time. So you cannot accept multiple users at the same time.

However, gunicorn is a solid, easy-to-use WSGI server that will let you spawn multiple workers (separate processes), and even comes with asynchronous workers when you need to deploy your application.

However, to answer your question, since, they run on separate threads, the data that exists in the database at the specific time when the query is run in that thread will be used/returned.

I hope this answers your query.

answered Nov 13, 2016 at 11:05

Rohin Gopalakrishnan

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dyop Over a year ago

I don't know how do this.

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