On 18 February 2016 at 02:47, Peter Eisentraut <peter_e@gmx.net> wrote:
It would be nice if pg_ctl promote supported the -w (wait) option.
How could pg_ctl determine when the promotion has finished?
We could query pg_is_in_recovery(), but that would require database access, which we got rid of in pg_ctl.
We could check when recovery.conf is gone or recovery.done appears. This could work, but I think some people are trying to get rid of these files, so building a feature on that might be a problem? (I think the latest news on that was that the files might be different in this hypothetical future but there would still be a file to prevent re-recovery on restart.)
Other ideas?
We use a trigger file under the covers, so a promotion complete file seems useful also, but crappy.
Perhaps we should have a Server Status file that shows Standby or Master, obviously not updated on crash.
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Simon Riggs http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services