[feike]

Patroni does have synchronous_mode_strict setting, which may be what you're looking for:

This parameter prevents Patroni from switching off the synchronous replication on the primary when no synchronous standby candidates are available. As a downside, the primary is not be available for writes (unless the Postgres transaction explicitly turns of synchronous_mode), blocking all client write requests until at least one synchronous replica comes up.

https://patroni.readthedocs.io/en/latest/replication_modes.h...

edit: seems I missed this discussion on twitter: https://twitter.com/jepsen_io/status/1265626035380346881

[aphyr]

Er, again, the docs say "it is still possible to lose transactions even when using synchronous_mode_strict". I've talked about this with some of the Stolon folks on Twitter, and we're not exactly sure how that manifests--possibly an SI or SSI violation.

[merb]

why is stolon more safe than? I tought stolon uses synchronous replication of pg aswell?