From: Tom Lane <tgl@sss.pgh.pa.us>
To: Alvaro Herrera <alvherre@2ndquadrant.com>
cc: "ktm@rice.edu" <ktm@rice.edu>, Steve.Toutant@inspq.qc.ca,
	pgsql-admin@postgresql.org
Subject: Re: exceeded MAX_ALLOCATED_DESCS while trying to open file
In-reply-to: <20130528163332.GW15045@eldon.alvh.no-ip.org>
References: 
 <OF419B5767.8A3C9ADB-ON85257B79.005491E9-85257B79.0054F6F1@isn.rtss.qc.ca>
	<20130528154837.GQ12507@aart.rice.edu>
	<20130528163332.GW15045@eldon.alvh.no-ip.org>
Comments: In-reply-to Alvaro Herrera <alvherre@2ndquadrant.com>
	message dated "Tue, 28 May 2013 12:33:33 -0400"
Date: Sat, 01 Jun 2013 01:07:34 -0400
Message-ID: <15375.1370063254@sss.pgh.pa.us>
Precedence: bulk
Sender: pgsql-admin-owner@postgresql.org

Alvaro Herrera <alvherre@2ndquadrant.com> writes:
> ktm@rice.edu wrote:
>> Each SELECT opens your FOREIGN TABLE so you are opening it 10 times. This is
>> hardcoded by a #define in ./src/backend/storage/file/fd.c during the build so
>> you would need to recompile the software yourself to change it. Can you re-
>> write your query using a single SELECT or possibly read the data into a
>> temporary table for processing?

> To me this sounds like a bug in whatever FDW is being used.

Yeah, we need to fix file_fdw so that it's using virtual rather than
physical file descriptors ...

			regards, tom lane


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