Re: Use durable_unlink for .ready and .done files for WAL segmentremoval

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От Michael Paquier
Тема Re: Use durable_unlink for .ready and .done files for WAL segmentremoval
Дата
Msg-id 20181205013443.GE2407@paquier.xyz
обсуждение исходный текст
Ответ на Re: Use durable_unlink for .ready and .done files for WAL segmentremoval  ("Bossart, Nathan" <bossartn@amazon.com>)
Ответы Re: Use durable_unlink for .ready and .done files for WAL segmentremoval  ("Bossart, Nathan" <bossartn@amazon.com>)
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On Tue, Dec 04, 2018 at 08:40:40PM +0000, Bossart, Nathan wrote:
> Thanks for the updated patch!  The code looks good to me, the patch
> applies cleanly and builds without warnings, and it seems to work well
> in my manual tests.  I just have a few wording suggestions.

How are you testing this?  I just stop the server and manually touch
some fake status files in archive_status :)

> I would phrase this comment this way:
>
>         Since archive_status files are not durably removed, a system
>         crash could leave behind .ready files for WAL segments that
>         have already been recycled or removed.  In this case, simply
>         remove the orphan status file and move on.

Fine for me.  Thanks!

> +     ereport(WARNING,
> +             (errmsg("removed orphan archive status file %s",
> +                     xlogready)));
>
> I think we should put quotes around the file name like we do elsewhere
> in pgarch_ArchiverCopyLoop().

Done.

> +                    ereport(WARNING,
> +                            (errmsg("failed removal of \"%s\" too many times, will try again later",
> +                                    xlogready)));
>
> I'd suggest mirroring the log statement for failed archiving commands
> and saying something like, "removing orphan archive status file \"%s\"
> failed too many times, will try again later."  IMO that makes it
> clearer what is failing and why we are removing it in the first place.

"removal of" is more consistent here I think, so changed this way with
your wording merged.
--
Michael

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