Re: Disallow cancellation of waiting for synchronous replication

[Andrey Borodin]

> 25 дек. 2019 г., в 15:28, Maksim Milyutin <milyuti...@gmail.com> написал(а):
> 
>> Synchronous replication
>> does not guarantee that a committed write is actually on any replica,
>> but it does in general guarantee that a commit has been replicated
>> before sending a response to the client. That's arguably more
>> important because the rest of what the application might depend on the
>> transaction completing and replicating successfully. I don't know of
>> cases other than cancellation in which a response is sent to the
>> client without replication when synchronous replication is enabled.
> 
> 
> Yes, at query canceling (e.g. by timeout from client driver) client receives 
> response about completed transaction (though with warning which not all 
> client drivers can handle properly) and the guarantee about successfully 
> replicated transaction *violates*.

We obviously need a design discussion here to address the issue. But the 
immediate question is should we add this topic to January CF items?

Best regards, Andrey Borodin.