Redis - The Definitive Guide - Data Modeling- Caching- And Messaging Pdf.pdf – Fast

# During checkout (simplified) MULTI HINCRBY product:1001 stock -1 RPUSH pending_inventory_updates '"product_id":1001,"delta":-1,"order_id":777' EXEC PUBLISH inventory_changes '"product_id":1001,"action":"sold","quantity":1'

HMSET product:1001 name "Wireless Headphones" price 79.99 stock 250 Maya updates stock using HINCRBY (atomic decrement):

They implement a for reliable messaging: