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From: Taylor Blau <me@ttaylorr.com>
To: Christian Couder <christian.couder@gmail.com>
Cc: Junio C Hamano <gitster@pobox.com>,
	git@vger.kernel.org, John Cai <johncai86@gmail.com>,
	Jonathan Tan <jonathantanmy@google.com>,
	Jonathan Nieder <jrnieder@gmail.com>,
	Derrick Stolee <stolee@gmail.com>, Patrick Steinhardt <ps@pks.im>,
	Christian Couder <chriscool@tuxfamily.org>
Subject: Re: [PATCH 6/9] repack: add `--filter=<filter-spec>` option
Date: Thu, 22 Jun 2023 07:05:15 -0400	[thread overview]
Message-ID: <ZJQq64eOkOxh8Qyt@nand.local> (raw)
In-Reply-To: <CAP8UFD0PY283_C3K8N1cE=Rc98W7CfMArD5kzSnO-6yBqM3sTw@mail.gmail.com>

On Wed, Jun 21, 2023 at 05:04:48PM +0200, Christian Couder wrote:
> On Wed, Jun 21, 2023 at 1:20 PM Taylor Blau <me@ttaylorr.com> wrote:
> >
> > On Thu, Jun 15, 2023 at 05:43:27PM -0700, Junio C Hamano wrote:
> > > Christian Couder <christian.couder@gmail.com> writes:
> > >
> > > > After cloning with --filter=<filter-spec>, for example to avoid
> > > > getting unneeded large files on a user machine, it's possible
> > > > that some of these large files still get fetched for some reasons
> > > > (like checking out old branches) over time.
> > > >
> > > > In this case the repo size could grow too much for no good reason and a
> > > > way to filter out some objects would be useful to remove the unneeded
> > > > large files.
> > >
> > > Makes sense.
> > >
> > > If we repack without these objects, when the repository has a
> > > promisor remote, we should be able to rely on that remote to supply
> > > them on demand, once we need them again, no?
> >
> > I think in theory, yes, but this patch series (at least up to this
> > point) does not seem to implement that functionality by marking the
> > relevant remote(s) as promisors, if they weren't already.
>
> Yeah, it's not part of this patch series to implement all the features
> that could be useful in the case of promisor remotes. This patch
> series only hopes to implement a `repack --filter=...` option that can
> help in a number of different use cases. I'm open to opinions about
> whether or not the doc and commit messages should talk, and how much,
> about use cases related to promisor remotes.
>
> > > [...] It does smell somewhat similar to the cruft packs but not
> > > really (the choice over there is between exploding to loose and
> > > keeping in a pack, and never involves loss of objects).
> >
> > Indeed. `pack-objects`'s `--stdin-packs` and `--cruft` work similarly,
> > and I believe that we could use `--stdin-packs` here instead of having
> > to store the list of objects which don't meet the filter's spec. IOW, I
> > think that this similarity is no coincidence...
>
> Yeah, I agree that we could use `--stdin-packs` to implement `repack
> --filter=...`. I am just not sure it's the best path forward
> performance wise in the long run. So others' opinions are welcome
> about that.

I think it would almost certainly have comparable performance in most
cases, and significantly better performance in large repositories. IIUC,
the current system has to remember the OID of every object which did not
pass the filter, and then construct a pack containing just those
objects.

It would be nice from a memory-savings perspective to not have to
remember these OIDs. But it also just seems error prone to me to do so:
what if we lose an OID, or reorder the list?

I dunno. I feel pretty strongly that implementing this in terms of:

  - Write a filtered pack.
  - Construct the list of existing packs (marked with '-') and the
    filtered pack.
  - Pass that as input to `git pack-objects --stdin-packs`
  - If '-d' given, delete any existing pack(s).

Thanks,
Taylor

  reply	other threads:[~2023-06-22 11:05 UTC|newest]

Thread overview: 161+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-06-14 19:25 [PATCH 0/9] Repack objects into separate packfiles based on a filter Christian Couder
2023-06-14 19:25 ` [PATCH 1/9] pack-objects: allow `--filter` without `--stdout` Christian Couder
2023-06-21 10:49   ` Taylor Blau
2023-07-05  6:16     ` Christian Couder
2023-06-14 19:25 ` [PATCH 2/9] pack-objects: add `--print-filtered` to print omitted objects Christian Couder
2023-06-15 22:50   ` Junio C Hamano
2023-06-21 10:52     ` Taylor Blau
2023-06-21 11:11       ` Christian Couder
2023-06-21 11:54         ` Taylor Blau
2023-06-14 19:25 ` [PATCH 3/9] t/helper: add 'find-pack' test-tool Christian Couder
2023-06-15 23:32   ` Junio C Hamano
2023-06-21 10:40     ` Christian Couder
2023-06-21 10:54     ` Taylor Blau
2023-06-14 19:25 ` [PATCH 4/9] repack: refactor piping an oid to a command Christian Couder
2023-06-15 23:46   ` Junio C Hamano
2023-06-21 10:55     ` Taylor Blau
2023-06-21 10:56     ` Christian Couder
2023-06-14 19:25 ` [PATCH 5/9] repack: refactor finishing pack-objects command Christian Couder
2023-06-16  0:13   ` Junio C Hamano
2023-06-21 11:06     ` Taylor Blau
2023-06-21 11:19       ` Christian Couder
2023-06-21 11:05   ` Taylor Blau
2023-06-14 19:25 ` [PATCH 6/9] repack: add `--filter=<filter-spec>` option Christian Couder
2023-06-16  0:43   ` Junio C Hamano
2023-06-21 11:20     ` Taylor Blau
2023-06-21 15:04       ` Christian Couder
2023-06-22 11:05         ` Taylor Blau [this message]
2023-06-21 14:40     ` Christian Couder
2023-06-21 16:53       ` Junio C Hamano
2023-06-22  8:39         ` Christian Couder
2023-06-22 18:32           ` Junio C Hamano
2023-06-21 11:17   ` Taylor Blau
2023-07-05  7:18     ` Christian Couder
2023-06-14 19:25 ` [PATCH 7/9] gc: add `gc.repackFilter` config option Christian Couder
2023-06-14 19:25 ` [PATCH 8/9] repack: implement `--filter-to` for storing filtered out objects Christian Couder
2023-06-16  2:21   ` Junio C Hamano
2023-06-21 11:49   ` Taylor Blau
2023-06-21 12:08     ` Christian Couder
2023-06-21 12:25       ` Taylor Blau
2023-06-21 16:44         ` Junio C Hamano
2023-07-05  6:19     ` Christian Couder
2023-06-14 19:25 ` [PATCH 9/9] gc: add `gc.repackFilterTo` config option Christian Couder
2023-06-16  2:54   ` Junio C Hamano
2023-06-14 21:36 ` [PATCH 0/9] Repack objects into separate packfiles based on a filter Junio C Hamano
2023-06-16  3:08   ` Junio C Hamano
2023-07-05  6:08 ` [PATCH v2 0/8] " Christian Couder
2023-07-05  6:08   ` [PATCH v2 1/8] pack-objects: allow `--filter` without `--stdout` Christian Couder
2023-07-05  6:08   ` [PATCH v2 2/8] t/helper: add 'find-pack' test-tool Christian Couder
2023-07-05  6:08   ` [PATCH v2 3/8] repack: refactor finishing pack-objects command Christian Couder
2023-07-05  6:08   ` [PATCH v2 4/8] repack: refactor finding pack prefix Christian Couder
2023-07-05  6:08   ` [PATCH v2 5/8] repack: add `--filter=<filter-spec>` option Christian Couder
2023-07-05 17:53     ` Junio C Hamano
2023-07-24  9:01       ` Christian Couder
2023-07-24 18:28         ` Junio C Hamano
2023-07-25 15:22           ` Christian Couder
2023-07-25 17:25             ` Junio C Hamano
2023-07-25 23:08               ` Junio C Hamano
2023-08-08  8:45                 ` Christian Couder
2023-08-09 20:38                   ` Taylor Blau
2023-08-09 22:50                   ` Junio C Hamano
2023-08-09 23:38                     ` Junio C Hamano
2023-08-10  0:10                       ` Jeff King
2023-07-05 18:12     ` Junio C Hamano
2023-07-24  9:02       ` Christian Couder
2023-07-05  6:08   ` [PATCH v2 6/8] gc: add `gc.repackFilter` config option Christian Couder
2023-07-05  6:08   ` [PATCH v2 7/8] repack: implement `--filter-to` for storing filtered out objects Christian Couder
2023-07-05 18:26     ` Junio C Hamano
2023-07-24  9:00       ` Christian Couder
2023-07-24 18:18         ` Junio C Hamano
2023-07-25 13:41           ` Robert Coup
2023-07-25 16:50             ` Junio C Hamano
2023-07-25 15:45           ` Christian Couder
2023-07-05  6:08   ` [PATCH v2 8/8] gc: add `gc.repackFilterTo` config option Christian Couder
2023-07-24  8:59   ` [PATCH v3 0/8] Repack objects into separate packfiles based on a filter Christian Couder
2023-07-24  8:59     ` [PATCH v3 1/8] pack-objects: allow `--filter` without `--stdout` Christian Couder
2023-07-25 22:38       ` Taylor Blau
2023-07-25 23:51         ` Junio C Hamano
2023-07-24  8:59     ` [PATCH v3 2/8] t/helper: add 'find-pack' test-tool Christian Couder
2023-07-25 22:44       ` Taylor Blau
2023-08-08  8:28         ` Christian Couder
2023-07-24  8:59     ` [PATCH v3 3/8] repack: refactor finishing pack-objects command Christian Couder
2023-07-25 22:45       ` Taylor Blau
2023-07-24  8:59     ` [PATCH v3 4/8] repack: refactor finding pack prefix Christian Couder
2023-07-25 22:47       ` Taylor Blau
2023-08-08  8:29         ` Christian Couder
2023-07-24  8:59     ` [PATCH v3 5/8] repack: add `--filter=<filter-spec>` option Christian Couder
2023-07-25 23:04       ` Taylor Blau
2023-08-08  8:34         ` Christian Couder
2023-08-09 21:12           ` Taylor Blau
2023-07-24  8:59     ` [PATCH v3 6/8] gc: add `gc.repackFilter` config option Christian Couder
2023-07-25 23:07       ` Taylor Blau
2023-08-08  8:38         ` Christian Couder
2023-08-09 21:15           ` Taylor Blau
2023-07-24  8:59     ` [PATCH v3 7/8] repack: implement `--filter-to` for storing filtered out objects Christian Couder
2023-07-24  8:59     ` [PATCH v3 8/8] gc: add `gc.repackFilterTo` config option Christian Couder
2023-07-25 23:10     ` [PATCH v3 0/8] Repack objects into separate packfiles based on a filter Taylor Blau
2023-08-08  8:26     ` [PATCH v4 " Christian Couder
2023-08-08  8:26       ` [PATCH v4 1/8] pack-objects: allow `--filter` without `--stdout` Christian Couder
2023-08-08  8:26       ` [PATCH v4 2/8] t/helper: add 'find-pack' test-tool Christian Couder
2023-08-09 21:18         ` Taylor Blau
2023-08-08  8:26       ` [PATCH v4 3/8] repack: refactor finishing pack-objects command Christian Couder
2023-08-08  8:26       ` [PATCH v4 4/8] repack: refactor finding pack prefix Christian Couder
2023-08-09 21:20         ` Taylor Blau
2023-08-08  8:26       ` [PATCH v4 5/8] repack: add `--filter=<filter-spec>` option Christian Couder
2023-08-09 21:40         ` Taylor Blau
2023-08-08  8:26       ` [PATCH v4 6/8] gc: add `gc.repackFilter` config option Christian Couder
2023-08-08  8:26       ` [PATCH v4 7/8] repack: implement `--filter-to` for storing filtered out objects Christian Couder
2023-08-08  8:26       ` [PATCH v4 8/8] gc: add `gc.repackFilterTo` config option Christian Couder
2023-08-09 21:45       ` [PATCH v4 0/8] Repack objects into separate packfiles based on a filter Taylor Blau
2023-08-09 21:57         ` Junio C Hamano
2023-08-12  0:12         ` Christian Couder
2023-08-12  0:00       ` [PATCH v5 " Christian Couder
2023-08-12  0:00         ` [PATCH v5 1/8] pack-objects: allow `--filter` without `--stdout` Christian Couder
2023-08-12  0:00         ` [PATCH v5 2/8] t/helper: add 'find-pack' test-tool Christian Couder
2023-08-12  0:00         ` [PATCH v5 3/8] repack: refactor finishing pack-objects command Christian Couder
2023-08-12  0:00         ` [PATCH v5 4/8] repack: refactor finding pack prefix Christian Couder
2023-08-12  0:00         ` [PATCH v5 5/8] repack: add `--filter=<filter-spec>` option Christian Couder
2023-08-12  0:00         ` [PATCH v5 6/8] gc: add `gc.repackFilter` config option Christian Couder
2023-08-12  0:00         ` [PATCH v5 7/8] repack: implement `--filter-to` for storing filtered out objects Christian Couder
2023-08-12  0:00         ` [PATCH v5 8/8] gc: add `gc.repackFilterTo` config option Christian Couder
2023-08-15  0:51         ` [PATCH v5 0/8] Repack objects into separate packfiles based on a filter Junio C Hamano
2023-08-15 21:43           ` Taylor Blau
2023-08-15 22:32             ` Junio C Hamano
2023-08-15 23:09               ` Taylor Blau
2023-08-15 23:18                 ` Junio C Hamano
2023-08-16  0:38                   ` Taylor Blau
2023-08-16 17:16                     ` Junio C Hamano
2023-09-11 15:20                 ` Christian Couder
2023-09-11 15:06         ` [PATCH v6 0/9] " Christian Couder
2023-09-11 15:06           ` [PATCH v6 1/9] pack-objects: allow `--filter` without `--stdout` Christian Couder
2023-09-11 15:06           ` [PATCH v6 2/9] t/helper: add 'find-pack' test-tool Christian Couder
2023-09-11 15:06           ` [PATCH v6 3/9] repack: refactor finishing pack-objects command Christian Couder
2023-09-11 15:06           ` [PATCH v6 4/9] repack: refactor finding pack prefix Christian Couder
2023-09-11 15:06           ` [PATCH v6 5/9] pack-bitmap-write: rebuild using new bitmap when remapping Christian Couder
2023-09-11 15:06           ` [PATCH v6 6/9] repack: add `--filter=<filter-spec>` option Christian Couder
2023-09-11 15:06           ` [PATCH v6 7/9] gc: add `gc.repackFilter` config option Christian Couder
2023-09-11 15:06           ` [PATCH v6 8/9] repack: implement `--filter-to` for storing filtered out objects Christian Couder
2023-09-11 15:06           ` [PATCH v6 9/9] gc: add `gc.repackFilterTo` config option Christian Couder
2023-09-25 15:25           ` [PATCH v7 0/9] Repack objects into separate packfiles based on a filter Christian Couder
2023-09-25 15:25             ` [PATCH v7 1/9] pack-objects: allow `--filter` without `--stdout` Christian Couder
2023-09-25 15:25             ` [PATCH v7 2/9] t/helper: add 'find-pack' test-tool Christian Couder
2023-09-25 15:25             ` [PATCH v7 3/9] repack: refactor finishing pack-objects command Christian Couder
2023-09-25 15:25             ` [PATCH v7 4/9] repack: refactor finding pack prefix Christian Couder
2023-09-25 15:25             ` [PATCH v7 5/9] pack-bitmap-write: rebuild using new bitmap when remapping Christian Couder
2023-09-25 15:25             ` [PATCH v7 6/9] repack: add `--filter=<filter-spec>` option Christian Couder
2023-09-25 15:25             ` [PATCH v7 7/9] gc: add `gc.repackFilter` config option Christian Couder
2023-09-25 15:25             ` [PATCH v7 8/9] repack: implement `--filter-to` for storing filtered out objects Christian Couder
2023-09-25 15:25             ` [PATCH v7 9/9] gc: add `gc.repackFilterTo` config option Christian Couder
2023-09-25 19:14             ` [PATCH v7 0/9] Repack objects into separate packfiles based on a filter Junio C Hamano
2023-09-25 22:41               ` Taylor Blau
2023-10-02 16:54             ` [PATCH v8 " Christian Couder
2023-10-02 16:54               ` [PATCH v8 1/9] pack-objects: allow `--filter` without `--stdout` Christian Couder
2023-10-02 16:54               ` [PATCH v8 2/9] t/helper: add 'find-pack' test-tool Christian Couder
2023-10-02 16:54               ` [PATCH v8 3/9] repack: refactor finishing pack-objects command Christian Couder
2023-10-02 16:54               ` [PATCH v8 4/9] repack: refactor finding pack prefix Christian Couder
2023-10-02 16:55               ` [PATCH v8 5/9] pack-bitmap-write: rebuild using new bitmap when remapping Christian Couder
2023-10-02 16:55               ` [PATCH v8 6/9] repack: add `--filter=<filter-spec>` option Christian Couder
2023-10-02 16:55               ` [PATCH v8 7/9] gc: add `gc.repackFilter` config option Christian Couder
2023-10-02 16:55               ` [PATCH v8 8/9] repack: implement `--filter-to` for storing filtered out objects Christian Couder
2023-10-02 16:55               ` [PATCH v8 9/9] gc: add `gc.repackFilterTo` config option Christian Couder
2023-10-02 20:14               ` [PATCH v8 0/9] Repack objects into separate packfiles based on a filter Taylor Blau

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