On Fri, Mar 20, 2026 at 4:33 AM Xuneng Zhou <xunengzhou(at)gmail(dot)com> wrote:
>
> After taking a closer look, I'm less certain about this. I'll
> investigate further. Could you also explain why you think this is the
> case?
The mechanism is in RequestXLogStreaming (walreceiverfuncs.c, around
line 276): it explicitly truncates recptr to the segment start before
passing it to the walreceiver. So even when both nodes have replayed
the same records, the cascade's startpoint lands at the beginning of
the next segment while the upstream's GetStandbyFlushRecPtr returns
replayPtr somewhere inside the current one.
I covered this in more detail in my reply to your previous message.
Best regards,
Marco