I'm curious about how systems that automate synchronization between buckets work. Especially in a global structure serving a large number of users, what should we consider when synchronizing buckets with a CDN? Also, which approaches best ensure data consistency?
How do you synchronize a bucket with a CDN?
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Wow, so I did a small internship on a project like this, bro, and for bucket synchronization, we initially used AWS S3's built-in cross-region replication feature. But since we needed immediate global consistency, we ended up triggering updates manually using "S3 Event Notifications" + Lambdas.
For the CDN side, we kept CloudFront's default cache TTLs as low as possible and used origin failover to direct users to the most up-to-date data. The most stable results came from using "DynamoDB Global Tables" for multi-master synchronization and treating the buckets more like background caches.
The easiest way to ensure data consistency was running buckets in nearby regions simultaneously and using S3 Transfer Acceleration to handle sync interruptions.