Prisma•3mo ago

Hitting connection limits multiple times in a microservice environment

I run a bunch of AWS Fargate tasks and they all have their own prisma client connecting to the same database. Frequently, I come across the following error

Timed out fetching a new connection from the connection pool. More info: http://pris.ly/d/connection-pool (Current connection pool timeout: 10, connection limit: 3)

They're all relatively small instances, with 1vcpu 1gb ram each, and my metrics stay at around 30-40% usage so no need to upgrade them. However sometimes they come across multiple write operations that lead to the error above; I've read in other threads that just changing the connection limit isn't really ideal, and might just be sweeping the problem under the rug. Should I be doing anything specific to mitigate this?

1 Reply

Nurul•3mo ago

How many database connections does your database support? Assuming that you are using a Postgres database, can you run this SQL to check the number of database connections occupied by each application connected to your database?

SELECT application_name, usename, state, COUNT(*) AS connection_count
FROM pg_stat_activity
GROUP BY application_name, usename, state
ORDER BY connection_count DESC;

SELECT application_name, usename, state, COUNT(*) AS connection_count
FROM pg_stat_activity
GROUP BY application_name, usename, state
ORDER BY connection_count DESC;

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Hitting connection limits multiple times in a microservice environment