On Mon, Jul 11, 2016 at 7:01 PM, Magnus Hagander <mag...@hagander.net> wrote:
> But isn't this also a pre-existing bug in 9.5? Or did we change something
> else that suddenly made it visible?

What has been patched here is a defect caused by pg_start_backup(),
and not pg_basebackup. In the case of the latter, ThisTimelineID gets
set by GetStandbyFlushRecPtr() in the context of the WAL sender used
to send the base backup. In short, this is only a defect of 9.6, where
pg_start_backup() can be used on standbys for the first time for
non-exclusive backups.

So the issue does not actually pre-exist, GetStandbyFlushRecPtr()
playing its role to set up the timeline ID.

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