Using write forwarding in an Amazon Aurora global database

You can reduce the number of endpoints that you need to manage for applications running on your Aurora global database, by using write forwarding. With write forwarding enabled, secondary clusters in an Aurora global database forward SQL statements that perform write operations to the primary cluster. The primary cluster updates the source and then propagates resulting changes back to all secondary AWS Regions.

The write forwarding configuration saves you from implementing your own mechanism to send write operations from a secondary AWS Region to the primary Region. Aurora handles the cross-Region networking setup. Aurora also transmits all necessary session and transactional context for each statement. The data is always changed first on the primary cluster and then replicated to the secondary clusters in the Aurora global database. This way, the primary cluster is the source of truth and always has an up-to-date copy of all your data.