In 9.5, the default pg_ctl stop mode was changed from "smart" to "fast".
In pg_upgrade, there is this code: void stop_postmaster(bool fast) { ... exec_prog(SERVER_STOP_LOG_FILE, NULL, !fast, "\"%s/pg_ctl\" -w -D \"%s\" -o \"%s\" %s stop", cluster->bindir, cluster->pgconfig, cluster->pgopts ? cluster->pgopts : "", fast ? "-m fast" : ""); ... } So, when upgrading from 9.5 or later, code that requested a non-fast shutdown would now always get a fast shutdown. I think the last line should be changed to something like fast ? "-m fast" : "-m smart"); -- Peter Eisentraut http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers