On 2/18/16 3:33 AM, Andres Freund wrote: > Hi, > > On 2016-02-17 21:47:50 -0500, Peter Eisentraut wrote: >> It would be nice if pg_ctl promote supported the -w (wait) option. >> >> How could pg_ctl determine when the promotion has finished? > > How about looking into pg_control? ControlFileData->state ought to have > the correct information.
Is it safe to read pg_control externally without a lock? pg_controldata will just report a CRC error and proceed, and if you're not sure you can just run it again. But if a promotion fails every so often because of concurrent pg_control writes, that would make this feature annoying. -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
