Re: "unexpected EOF" messages

Excerpts from Magnus Hagander's message of jue may 03 10:58:12 -0400 2012:
> On Thu, May 3, 2012 at 4:53 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> > In the context of yesterday's discussions, I wonder whether a filter by
> > SQLSTATE would be appropriate.
> 
> I'm worried it's not really granular enough.

Yeah.

> regexp-on-text would also have the advantage of being able to filter
> stuff coming from stored procedures or such as well - without having
> to invent a whole bunch of SQLSTATEs to put in the stored procedures
> (consider the usecase when somebody else wrote the stored procedures
> and the DBA wants to limit the logging).
> 
> We could have two parameters of course - log_filter_sqlstate and
> log_filter_re or something like that...

The problem with regexes is that they are so expensive.  You just need
to forget the start anchor and it's suddenly a serious problem.  And if
you want to filter out a second message, the config option starts
to become rather unwieldy.

I wonder if there's a better way to selectively filter out messages --
say some sort of config file that contains a list of filenames/numbers
of messages to disable.  That particular idea would be a pain to
maintain, of course, not to mention that it'd change from one release to
the next.

Hey, maybe we could add a UUID to each ereport() call site ;-)

(Maybe the sites that have a load problem caused by log traffic are not
the same sites that would like to filter out messages, and thus using
regexes is not really a problem.  It doesn't seem to be the kind of bet
that we want to do.)

-- 
Álvaro Herrera <alvherre@commandprompt.com>
The PostgreSQL Company - Command Prompt, Inc.
PostgreSQL Replication, Consulting, Custom Development, 24x7 support