Greetings,
* norbert poellmann (np@ibu.de) wrote:
> https://www.postgresql.org/docs/current/different-replication-solutions.html
> is listing a shared disk solution for HA.
Yeah. Frankly, it's bad advice and we should remove it. "Rapid
failover" is a bit laughable compared to replication when you consider
that crash recovery can take a very, very long time (depending on how
much outstanding WAL has been written since the last checkpoint but with
extended checkpoints and single-process WAL replay, crash recovery could
be on the order of hours ...) and promoting an online replica takes only
moments.
Ditto for block-based replication.
Probably should talk about WAL shipping more as "Physical Replication".
At the least, physical replication should really be listed first and
then logical replication, perhaps even in a distinct "included as part
of PostgreSQL" section with everything else pushed down to "some other
things exist that you could try"...
Thanks,
Stephen