On 2/8/16 2:45 PM, Tom Lane wrote:
Alvaro Herrera <alvhe...@2ndquadrant.com> writes:
Tom Lane wrote:
What I'd like to do to investigate this is put in a temporary HEAD-only
patch that makes ShutdownXLOG() and its subroutines much chattier about
how far they've gotten and what time it is, and also makes pg_ctl print
out the current time if it gives up waiting.

Seems like a reasonable place to start.  I assume you'll be installing
some debug-elog calls, enabled by default, and then once the problem is
fixed, we'll change the default to disabled but keep the actual calls?

I had in mind to just "git revert" the patch when we're done with it.
There might be some parts we want to keep (for instance, I'm thinking of
logging "postmaster is done" after we've unlinked the pidfile, which might
be useful permanently).  But I plan to err on the side of noisiness for
the moment, rather than make something I think has long-term value.

It's already difficult enough for DBAs to debug some performance issues, so getting rid of logging is a step backwards. I realize it's unlikely that you could run DEBUG2 in a prod environment, but we still shouldn't be reducing visibility.
Jim Nasby, Data Architect, Blue Treble Consulting, Austin TX
Experts in Analytics, Data Architecture and PostgreSQL
Data in Trouble? Get it in Treble! http://BlueTreble.com

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