Improving GraphQL API performance and consistency with AWS AppSync Caching and DynamoDB Transactions support
Article Summary
AWS just shipped two features that solve opposite problems: making GraphQL APIs blazing fast and keeping DynamoDB writes bulletproof. Here's how they change the game for mobile backends.
AWS AppSync now supports server-side caching and DynamoDB transactions for GraphQL APIs. These features address two critical mobile app challenges: reducing latency for frequently accessed data and ensuring data consistency across complex operations.
Key Takeaways
- Three caching modes: none, full request, or per-resolver granular control
- Cache keys use user identity or arguments for multi-tenant scenarios
- DynamoDB transactions support up to 25 items with ACID guarantees
- Built-in monitoring dashboard tracks cache hits, misses, and performance
- Per-resolver caching lets you cache specific fields while others hit live data
AppSync now offers managed caching to cut API latency and DynamoDB transactions to guarantee all-or-nothing writes across multiple tables.
About This Article
E-commerce applications deal with different data update patterns. Inventory volumes change frequently, customer profiles update occasionally, and transaction IDs never change. When you access data sources directly, it adds latency and hurts performance.
AWS AppSync lets developers cache specific GraphQL fields or query operations with custom TTL values through per-resolver caching. Other fields can still hit live data sources directly.
The AppSync monitoring dashboard shows how well caching works by tracking hits, misses, evictions, and bytes used. Developers can measure performance improvements without having to maintain infrastructure.