This might be nitpicking (or i'm currently missing something), but i recognized that setting wal_buffers = -1 always triggers the following on reload, even if nothing to wal_buffers had changed:

$ pg_ctl reload
LOG:  received SIGHUP, reloading configuration files
LOG:  parameter "wal_buffers" cannot be changed without restarting the server

This only happens when you have wal_buffers set to -1.

--
Thanks

        Bernd

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