I revisited the issue and examined the problem and the proposed solution in
more depth. It’s now clear to me why the approach won’t work: if multiple
timelines are discovered at once (for example, if a replica is stopped, a
standby is promoted several times, and only then the replica resumes
replication), the current design may copy part of an earlier timeline from
the wrong predecessor into the current segment.
I’ll get back with a more correct solution soon. In the meantime,
suggestions are welcome!
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Alena Vinter