> Chain replication is how a huge percentage of real-world cloud-scale data replication is done
Is this still true today? I know that Facebook does [1], but I don't have references for any other places which use it.
[1] https://engineering.fb.com/2022/05/04/data-infrastructure/de...
Inside multiple AWS products (including DynamoDB, Kinesis, and Aurora DSQL) is a system called Journal that moves a ton of data. It uses a variant of chain replication.
EBS is also a chain replication variant at heart, and moves even more data.