Re: patch to allow disable of WAL recycling - Mailing list pgsql-hackers

From Jerry Jelinek
Subject Re: patch to allow disable of WAL recycling
Date
Msg-id CACPQ5Fr_dDudiGms4FW1T0j0QvDii_-GnBzFrBvGeR88r_usSg@mail.gmail.com
Whole thread Raw
In response to Re: patch to allow disable of WAL recycling  (Thomas Munro <thomas.munro@gmail.com>)
List pgsql-hackers


On Mon, Apr 1, 2019 at 7:48 PM Thomas Munro <thomas.munro@gmail.com> wrote:
On Sat, Mar 30, 2019 at 11:18 AM Jerry Jelinek <jerry.jelinek@joyent.com> wrote:
> I went through your new version of the patch and it all looks great to me.

I moved the error handling logic around a bit so we'd capture errno
immediately after the syscalls.  I also made a couple of further
tweaks to comments and removed some unnecessary casts.

I suspect we took so long on this because of lack of ZFS knowledge and
uncertainty about the precise reason for the current coding in terms
of crash safety in general.  After learning more, I now suspect the
claim about fsyncdata(2) and indirect blocks in the comments may be
incorrect (it may stem from buggy behaviour on older Linux kernels),
but I'm not sure and it's not this patch's job to change that.

Pushed.  Thanks for the patch!

 Thanks a lot for getting this integrated, and thanks to everyone else who gave me so much feedback and assistance during this process!
Jerry

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