From: Jeff King <peff@peff.net>
To: Junio C Hamano <gitster@pobox.com>
Cc: Johannes Schindelin via GitGitGadget <gitgitgadget@gmail.com>,
git@vger.kernel.org,
Johannes Schindelin <johannes.schindelin@gmx.de>
Subject: Re: [PATCH 4/4] get_oid(): when an object was not found, try harder
Date: Wed, 13 Mar 2019 22:40:23 -0400 [thread overview]
Message-ID: <20190314024023.GA3889@sigill.intra.peff.net> (raw)
In-Reply-To: <20190314022245.GA1414@sigill.intra.peff.net>
On Wed, Mar 13, 2019 at 10:22:46PM -0400, Jeff King wrote:
> Try this:
>
> -- >8 --
> mkfifo in
> (git cat-file --batch-check <in) &
> exec 9>in
>
> git commit --allow-empty -m one
> git commit --allow-empty -m two
>
> git rev-parse --short HEAD^ >&9
> git repack -adk
> git rev-parse --short HEAD >&9
> -- >8 --
>
> The second object will (usually) be reported as "missing", even though
> by calling reprepare_packed_git(), we would then find it in the
> packfile.
>
> I say "usually" because if the two commits have the same first-byte to
> their sha1, then we'd load both into the loose cache during the first
> request, and use that during the second request.
>
> After this patch, it works consistently (we flush both the loose cache
> and the cached set of packs, and find the packed version).
By the way, an interesting implication of this is that we're doing the
re-prepare only when we come up with no object. But we _could_ actually
come up with the wrong object when we should say "ambiguous". I.e., the
user asks for 1234abcd. We have 1234abcde in a pack, and 1234abcdf
loose. A simultaneous process repacks, and we see neither copy of
1234abcdf, reporting that 1234abcde is the right answer.
I'm not sure it's really worth addressing (just because I don't think
there's a good way to do it that isn't expensive).
-Peff
next prev parent reply other threads:[~2019-03-14 2:41 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-13 10:16 [PATCH 0/4] get_oid: cope with a possibly stale loose object cache Johannes Schindelin via GitGitGadget
2019-03-13 10:16 ` [PATCH 1/4] rebase -i: demonstrate obscure loose object cache bug Johannes Schindelin via GitGitGadget
2019-03-13 16:11 ` Ævar Arnfjörð Bjarmason
2019-03-13 16:35 ` Jeff King
2019-03-13 16:53 ` Jeff King
2019-03-13 22:40 ` Johannes Schindelin
2019-03-14 0:07 ` Jeff King
2019-03-13 22:27 ` Johannes Schindelin
2019-03-14 0:05 ` Jeff King
2019-03-14 6:40 ` Johannes Sixt
2019-03-14 13:06 ` Johannes Schindelin
2019-03-14 1:12 ` Junio C Hamano
2019-03-14 12:44 ` Johannes Schindelin
2019-03-13 10:16 ` [PATCH 2/4] sequencer: improve error message when an OID could not be parsed Johannes Schindelin via GitGitGadget
2019-03-14 1:14 ` Junio C Hamano
2019-03-13 10:16 ` [PATCH 3/4] sequencer: move stale comment into correct location Johannes Schindelin via GitGitGadget
2019-03-13 10:16 ` [PATCH 4/4] get_oid(): when an object was not found, try harder Johannes Schindelin via GitGitGadget
2019-03-14 1:29 ` Junio C Hamano
2019-03-14 2:22 ` Jeff King
2019-03-14 2:40 ` Jeff King [this message]
2019-03-14 4:05 ` Junio C Hamano
2019-03-14 18:55 ` Jeff King
2019-03-14 3:49 ` Junio C Hamano
2019-03-14 13:17 ` Johannes Schindelin
2019-03-14 18:57 ` Jeff King
2019-03-14 19:55 ` Johannes Schindelin
2019-03-13 15:33 ` [PATCH 0/4] get_oid: cope with a possibly stale loose object cache Jeff King
2019-03-14 15:33 ` [PATCH v2 0/4] get_short_oid: " Johannes Schindelin via GitGitGadget
2019-03-14 15:33 ` [PATCH v2 1/4] rebase -i: demonstrate obscure loose object cache bug Johannes Schindelin via GitGitGadget
2019-03-14 15:33 ` [PATCH v2 2/4] sequencer: improve error message when an OID could not be parsed Johannes Schindelin via GitGitGadget
2019-03-14 15:33 ` [PATCH v2 3/4] sequencer: move stale comment into correct location Johannes Schindelin via GitGitGadget
2019-03-14 15:33 ` [PATCH v2 4/4] get_oid(): when an object was not found, try harder Johannes Schindelin via GitGitGadget
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