Monday, August 18, 2014
On Thursday, August 14, 2014 11:29:18 AM UTC-7, Hassan Schroeder wrote:
On Wed, Aug 13, 2014 at 2:32 PM, Zeb Haradon <zebha...@gmail.com> wrote:
> Summary: rails app using postgres randomly gets into a state where hstore
> array is returned as a string, and cannot be fixed without rebuilding the
> database
Not that familiar with (or fond of) postgres, but curious --
> You can see that in the broken instance, it is returning the hstore data as
> a string. Some pertinent info is that once it gets in this broken state, you
> can drop and restore the database, or rename the database, and as long as
> it's on the same postgres sever, it's still broken - you have to rebuild the
> whole database for it to work.
What is the difference exactly between "drop and restore" and
"rebuild"?
Sorry, I misspoke. I meant that once the problem occurs you have to actually reinstall postgres to get it to work again. So we drop and restore the database, hundreds of times, with no failure, then one day the same thing causes a failure. After that, even after dropping and restoring the database, hstore arrays are still returned as strings, for every database on the server. Then postgres is reinstalled, and it starts working again. Simply reinstalling the hstore extension is not enough to fix the problem - the whole postgres instance must be reinstalled.
> And if you point the app (change
> database.yml) to point to a different server, it works.
What's in the postgres logs when this fails? Is there anything in the
Rails logs at startup that differs between working/not working?
Nothing useful beyond that it's returning the hstore array as a string, nothing that tells us why. The cleanest log info is the info from the irb log I posted.
Have you put any additional logging into the connection adapter?
Not yet but the thing I'm trying to figure out how to do now is just repro the problem. I've repeated the deployment process hundreds of times with no repro... it works and works and works then the same thing fails.
--
Hassan Schroeder ------------------------ hassan.s...@gmail.com
http://about.me/hassanschroeder
twitter: @hassan
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