git.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Taylor Blau <me@ttaylorr.com>
To: Derrick Stolee <stolee@gmail.com>
Cc: Jeff King <peff@peff.net>,
	Derrick Stolee via GitGitGadget <gitgitgadget@gmail.com>,
	git@vger.kernel.org, Taylor Blau <me@ttaylorr.com>,
	Derrick Stolee <derrickstolee@github.com>,
	Derrick Stolee <dstolee@microsoft.com>
Subject: Re: [PATCH v3] commit-graph: ignore duplicates when merging layers
Date: Thu, 8 Oct 2020 12:42:43 -0400	[thread overview]
Message-ID: <20201008164243.GA358741@nand.local> (raw)
In-Reply-To: <e1d4c427-b9a7-261a-6297-4a4768e8dbc0@gmail.com>

On Thu, Oct 08, 2020 at 12:26:29PM -0400, Derrick Stolee wrote:
> At this point, any disagreement between rows would be corrupt data
> in one or the other, and it should be caught by the 'verify'
> subcommand. It definitely would be caught by 'verify' in the merged
> layer after the 'write' completes.

Yeah, I'm fine with assuming that this data is correct here, since we
would have already "checked" it after we wrote it.

Of course, that means that if we find another commit-graph bug that
writes bad data and fix it in a future version, old commit-graphs with
duplicate objects have a chance to persist their data.

But, we again have 'git commit-graph verify' as a last resort there, so
I think it's OK.

> At this point, we don't have any evidence that whatever causes the
> duplicate rows could possibly write the wrong data to the duplicate
> rows. I'll keep it in mind as we look for that root cause.

Thanks.

Taylor

  reply	other threads:[~2020-10-08 16:42 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-08 13:56 [PATCH] " Derrick Stolee via GitGitGadget
2020-10-08 14:15 ` Taylor Blau
2020-10-08 14:29   ` Derrick Stolee
2020-10-08 14:59 ` [PATCH v2] " Derrick Stolee via GitGitGadget
2020-10-08 15:04   ` [PATCH v3] " Derrick Stolee via GitGitGadget
2020-10-08 15:53     ` Jeff King
2020-10-08 16:26       ` Derrick Stolee
2020-10-08 16:42         ` Taylor Blau [this message]
2020-10-08 16:43         ` Jeff King
2020-10-09 20:53     ` [PATCH v4 0/2] " Derrick Stolee via GitGitGadget
2020-10-09 20:53       ` [PATCH v4 1/2] " Derrick Stolee via GitGitGadget
2020-10-09 20:53       ` [PATCH v4 2/2] commit-graph: don't write commit-graph when disabled Derrick Stolee via GitGitGadget
2020-10-09 21:12         ` Junio C Hamano
2020-10-09 21:17         ` Taylor Blau

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20201008164243.GA358741@nand.local \
    --to=me@ttaylorr.com \
    --cc=derrickstolee@github.com \
    --cc=dstolee@microsoft.com \
    --cc=git@vger.kernel.org \
    --cc=gitgitgadget@gmail.com \
    --cc=peff@peff.net \
    --cc=stolee@gmail.com \
    --subject='Re: [PATCH v3] commit-graph: ignore duplicates when merging layers' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
on how to clone and mirror all data and code used for this inbox