Re: making write location work (was: Efficient transaction-controlled synchronous replication)

Robert Haas <robertmhaas@gmail.com> writes:
> Specifically, if we're not going to remove write location, then I
> think we need to apply something like the attached.

>              while (walrcv_receive(0, &type, &buf, &len))
>                  XLogWalRcvProcessMsg(type, buf, len);
> +            /* Let the master know that we received some data. */
> +            XLogWalRcvSendReply();

What if we didn't actually receive any new data?
        regards, tom lane