Horton

Re: Use pg_pwritev_with_retry() instead of write() in dir_open_for_write() to avoid partial writes?

Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com>

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From: Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com>
To: Michael Paquier <michael@paquier.xyz>
Cc: Alvaro Herrera <alvherre@alvh.no-ip.org>, Nathan Bossart <nathandbossart@gmail.com>, Thomas Munro <thomas.munro@gmail.com>, PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Date: 2022-11-01T03:02:48Z
Lists: pgsql-hackers

Attachments

On Mon, Oct 31, 2022 at 11:50 AM Bharath Rupireddy
<bharath.rupireddyforpostgres@gmail.com> wrote:
>
> On Mon, Oct 31, 2022 at 5:01 AM Michael Paquier <michael@paquier.xyz> wrote:
> >
> > On Sun, Oct 30, 2022 at 03:44:32PM +0100, Alvaro Herrera wrote:
> > > So I'm kinda proposing that we only do the forward struct initialization
> > > dance when it really saves on things -- in particular, when it helps
> > > avoid or reduce massive indirect header inclusion.
> >
> > Sure.
>
> I don't think including pg_iovec.h in file_utils.h is a good idea. I
> agree that pg_iovec.h is fairly a small header file but file_utils.h
> is included in 21 .c files, as of today and the file_utils.h footprint
> might increase in future. Therefore, I'd vote for forward struct
> initialization as it is on HEAD today.

I'm attaching the v9 patch from upthread here again for further review
and to make CF bot happy.

-- 
Bharath Rupireddy
PostgreSQL Contributors Team
RDS Open Source Databases
Amazon Web Services: https://aws.amazon.com

Commits

  1. Revise pg_pwrite_zeros()

  2. Use pg_pwrite_zeros() in walmethods.c

  3. Introduce pg_pwrite_zeros() in fileutils.c

  4. Move pg_pwritev_with_retry() to src/common/file_utils.c

  5. Restore pg_pread and friends.

  6. Remove dead pread and pwrite replacement code.