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Re: warn if GUC set to an invalid shared library

Justin Pryzby <pryzby@telsasoft.com>

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From: Justin Pryzby <pryzby@telsasoft.com>
To: Michael Paquier <michael@paquier.xyz>
Cc: Tom Lane <tgl@sss.pgh.pa.us>, Maciek Sakrejda <m.sakrejda@gmail.com>, Robert Haas <robertmhaas@gmail.com>, "David G. Johnston" <david.g.johnston@gmail.com>, Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com>, pgsql-hackers@lists.postgresql.org
Date: 2022-06-16T03:50:14Z
Lists: pgsql-hackers 
I've started to think that we should really WARN whenever a (set of) GUC is set
in a manner that the server will fail to start - not just for shared libraries.

In particular, I think the server should also warn if it's going to fail to
start like this:

2022-06-15 22:48:34.279 CDT postmaster[20782] FATAL:  WAL streaming (max_wal_senders > 0) requires wal_level "replica" or "logical"

-- 
Justin