Re: walsummarizer can get stuck when switching timelines

[Andrey Borodin]

> On 2 Aug 2026, at 21:00, Alexander Lakhin <exclus...@gmail.com> wrote:
> 
> So it looks like the test might fail when the checkpoint record slips into
> segment 4.


I think swapping two SQL statements would be enough:

 $node2->safe_psql('postgres', <<EOM);
-SELECT pg_switch_wal();
 CHECKPOINT;
+SELECT pg_switch_wal();
 EOM

The CHECKPOINT is what gives the summarizer a redo point to close the
timeline-2 summary at, and node3 only ever reads completed segments from
the archive, so it has to be before pg_switch_wal().

CI shows no problems with this change to me.


Best regards, Andrey Borodin.