Marketplace-Research OpenSearch + Personalize Caching Best Practices A reference distillation of caching strategies for two-sided marketplaces running AWS OpenSearch (search) and AWS Personalize (recommendations behind a microservice). Contains 52 rules across 9 categories , ordered by cascade effect — from the upstream decision of whether to cache, through key design, personalisation boundary, strategy selection, TTL design, stampede protection, observability, and the lower-cascade categories of negative caching and tier composition. Each rule explains the WHY (the cost, latency, or correctn…