Re: pg_rewind: warn when checkpoint hasn't happened after promotion

At Tue, 07 Jun 2022 12:39:38 +0900 (JST), Kyotaro Horiguchi <horikyota.ntt@gmail.com> wrote in 
> One possible way to detect promotion reliably is to look into timeline
> history files. It is written immediately at promotion even on
> standbys.

The attached seems to work. It uses timeline history files to identify
the source timeline.  With this change pg_waldump no longer need to
wait for end-of-recovery to finish.

(It lacks doc part and test.. But I'm not sure how we can test this
behavior.)

regards.

-- 
Kyotaro Horiguchi
NTT Open Source Software Center