From: Junio C Hamano <gitster@pobox.com>
To: Taylor Blau <me@ttaylorr.com>
Cc: "SZEDER Gábor" <szeder.dev@gmail.com>, git@vger.kernel.org
Subject: Re: What's cooking in git.git (Jan 2024, #01; Tue, 2)
Date: Tue, 16 Jan 2024 15:42:38 -0800 [thread overview]
Message-ID: <xmqqedegx2tt.fsf@gitster.g> (raw)
In-Reply-To: <ZacRx1rbESvYiVgN@nand.local> (Taylor Blau's message of "Tue, 16 Jan 2024 18:31:19 -0500")
Taylor Blau <me@ttaylorr.com> writes:
>> A big red button solution to avoid this would be to uprev the
>> repository format version once you start writing v2 Bloom filters
>> anywhere in the layers. That way, existing Git clients would not be
>> able to touch it. I do not know if the cure is more severe than the
>> disease in that case, though.
>
> I tend to think that in this case the cure is probably worse than the
> disease. I expect it to be extremely rare that a user would upgrade to a
> modern version of Git, write commit-graphs, then downgrade, and try to
> write more commit-graphs.
But then the big red button solution would rarely misfire for users
because they will not downgrade (and see "gee, I now need to stick
to the newer version"), no?
I am not seriously suggesting to do this, but I am not sure if
documenting "don't do this because you'll break your repository"
is sufficient.
>> In any case, at least, we should be able to prepare the code that we
>> teach to grok v2 today so that they do not trigger the same segfault
>> when they see a commit graph layer containing v3 Bloom filters (or
>> later). Then we won't have to have the same conversation when we
>> somehow need to update Bloom filters again.
>
> This series should accomplish that by loading the Bloom chunk
> unconditionally, and only reading its filters when they match the
> given hash_version.
Good.
prev parent reply other threads:[~2024-01-16 23:42 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-03 1:02 What's cooking in git.git (Jan 2024, #01; Tue, 2) Junio C Hamano
2024-01-03 5:53 ` ps/refstorage-extension (was: What's cooking in git.git (Jan 2024, #01; Tue, 2)) Patrick Steinhardt
2024-01-03 9:01 ` What's cooking in git.git (Jan 2024, #01; Tue, 2) Jeff King
2024-01-03 16:37 ` Junio C Hamano
2024-01-05 8:59 ` Jeff King
2024-01-05 16:34 ` Junio C Hamano
2024-01-03 17:14 ` René Scharfe
2024-01-03 16:43 ` Taylor Blau
2024-01-03 18:08 ` Junio C Hamano
2024-01-13 18:35 ` SZEDER Gábor
2024-01-13 22:06 ` Taylor Blau
2024-01-13 23:41 ` SZEDER Gábor
2024-01-16 20:37 ` Taylor Blau
2024-02-25 22:59 ` SZEDER Gábor
2024-02-26 14:44 ` Taylor Blau
2024-01-13 22:51 ` SZEDER Gábor
2024-01-16 20:49 ` Taylor Blau
2024-01-16 22:45 ` Junio C Hamano
2024-01-16 23:31 ` Taylor Blau
2024-01-16 23:42 ` Junio C Hamano [this message]
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