From: Justin Pryzby <pryzby@telsasoft.com>
To: Patrick Mulrooney <mulroony@gmail.com>
Cc: pgsql-performance@lists.postgresql.org
Subject: Re: Increasing parallelism of queries while using file fdw and partitions
Date: Wed, 19 Dec 2018 00:51:49 -0600
Message-ID: <20181219065149.GF8042@telsasoft.com> (raw)
In-Reply-To: <aea30799-809c-f027-1a4b-0c03c7efa3f6@gmail.com>
References: <aea30799-809c-f027-1a4b-0c03c7efa3f6@gmail.com>
On Tue, Dec 18, 2018 at 08:39:36PM -0800, Patrick Mulrooney wrote:
> Wondering if anyone had any thoughts on how to tweak my setup to get it to
> read many files at once instead of one at a time when using file fdw and
> partitions.
I found this:
https://www.postgresql.org/docs/current/parallel-safety.html
|The following operations are always parallel restricted.
|Scans of foreign tables, unless the foreign data wrapper has an IsForeignScanParallelSafe API which indicates otherwise.
https://github.com/ergo70/vcf_fdw/blob/master/vcf_fdw/__init__.py
=> has no such API marker, since it's couple years old, same as multicorn.
Justin
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To: pgsql-performance@postgresql.org
Cc: pryzby@telsasoft.com, mulroony@gmail.com, pgsql-performance@lists.postgresql.org
Subject: Re: Increasing parallelism of queries while using file fdw and partitions
In-Reply-To: <20181219065149.GF8042@telsasoft.com>
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