Unexpected Memory Bloat When Caching Results with Rails 7 and Redis
I'm optimizing some code but Can someone help me understand I'm having trouble with I've been struggling with this for a few days now and could really use some help. I'm experiencing important memory bloat when using Rails 7 with Redis as a cache store. I've set up caching for some expensive database queries, but after a few hours of running the application, I'm noticing a steady increase in memory usage. My setup is as follows: ```ruby # config/environments/production.rb config.cache_store = :redis_cache_store, { url: ENV['REDIS_URL'], namespace: 'myapp::cache' } ``` I've implemented caching in my controller like this: ```ruby class ProductsController < ApplicationController def index @products = Rails.cache.fetch('products', expires_in: 12.hours) do Product.includes(:category).all.to_a end end end ``` Initially, I thought the memory leak might be related to the way I'm fetching and caching the records, so I tried using `to_a` to force loading the records into memory. However, that hasn't solved the scenario. I've also monitored the Redis memory usage and it seems to be behaving as expected, while the Rails server's memory keeps climbing. I used `memory_profiler` to get some insights, and it seems a lot of memory is being held by cached objects that aren't getting garbage collected. I tried calling `Rails.cache.clear` at specific intervals, but it didn't help the overall memory footprint. Is there a best practice for caching large datasets in Rails without causing memory issues? Iām using Ruby 3.1 and Redis 6.0. Any insights or advice on how to manage this better would be greatly appreciated! Thanks in advance! I'm on Ubuntu 20.04 using the latest version of Ruby. This is for a service running on Linux. What's the best practice here? This is my first time working with Ruby stable. I appreciate any insights! This is my first time working with Ruby 3.9. Hoping someone can shed some light on this.