Re: pg_upgrade: out of memory

On Mon, Feb 06, 2012 at 05:14:55PM -0500, deepak wrote:
> Hi!
>
> While running pg_upgrade, on one instance, it ran out of memory during the
> final stages of upgrade
> (just before it starts to "link" old database files to new ones).
>
>
> We are using Postgres 9.1.1, and I see that there were some fixes to pg_upgrade
> in 9.1.2, though
> it doesn't mention anything about memory issues as such.
>
> Wondering if anyone has run into a similar type of situation, and if so, how to
> solve it?
>
> Also, is it possible to recover the database once pg_upgrade aborts in this
> manner?
>
>
> Here's an excerpt from the log while running pg_upgrade:
> ...
> "bin/pg_ctl" -w  -D "data"  stop
> waiting for server to shut down....LOG:  received smart shutdown request
> LOG:  shutting down
> .......LOG:  database system is shut down
> . done
> server stopped
> Restoring user relation files
> Restoring user relation files
> pg_upgrade: out of memory
>
> pg_upgrade: out of memory

Wow, that's pretty amazing.  As the docs say, pg_upgrade doesn't modify
the old cluster so you should be fine in reverting to that.

As far as why it ran out of memory, I have no idea, and have never heard
of a report about that before.  Can you run it in a debugger and get a
backtrace?

--
  Bruce Momjian  <bruce@momjian.us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

  + It's impossible for everything to be true. +