Here is another stab at this subject.
This is a much simplified variant: When encountering a parameter change
in the WAL that is higher than the standby's current setting, we log a
warning (instead of an error until now) and pause recovery. If you
resume (unpause) recovery, the instance shuts down as before.
This allows you to keep your standbys running for a bit (depending on
lag requirements) and schedule the required restart more deliberately.
I had previously suggested making this new behavior configurable, but
there didn't seem to be much interest in that, so I have not included
that there.
The documentation changes are mostly carried over from previous patch
versions (but adjusted for the actual behavior of the patch).
--
Peter Eisentraut http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
