https://dev.classmethod.jp/en/articles/rds-multi-az-ena-express-srd/
Amazon RDS Multi-AZ synchronous replication now supports ENA Express | DevelopersIO
RDS Multi-AZ synchronous replication between AZs now supports ENA Express (SRD), expanding single-flow bandwidth from 5 Gbps to 25 Gbps. It can be enabled at...
amazon rdssynchronous replicationmultisupportsena
https://jira.mariadb.org/browse/MDEV-19140?attachmentOrder=asc
[MDEV-19140] Full synchronous replication - Jira
synchronous replicationmdevfulljira
https://antirez.com/news/66
WAIT: synchronous replication for Redis - antirez
synchronous replicationwaitredisantirez