Re: Incremental backup from a streaming replication standby fails

On Sat, 2024-06-29 at 07:01 +0200, Laurenz Albe wrote:
> I played around with incremental backup yesterday and tried $subject
>
> The WAL summarizer is running on the standby server, but when I try
> to take an incremental backup, I get an error that I understand to mean
> that WAL summarizing hasn't caught up yet.
>
> I am not sure if that is working as designed, but if it is, I think it
> should be documented.

I played with this some more. Here is the exact error message:

ERROR: manifest requires WAL from final timeline 1 ending at 0/1967C260, but this backup starts at 0/1967C190

By trial and error I found that when I run a CHECKPOINT on the primary,
taking an incremental backup on the standby works.

I couldn't fathom the cause of that, but I think that that should either
be addressed or documented before v17 comes out.

Yours,
Laurenz Albe