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From: Junio C Hamano <gitster@pobox.com>
To: Christian Couder <christian.couder@gmail.com>
Cc: git@vger.kernel.org, John Cai <johncai86@gmail.com>,
	Jonathan Tan <jonathantanmy@google.com>,
	Jonathan Nieder <jrnieder@gmail.com>,
	Taylor Blau <me@ttaylorr.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 11:32:23 -0700	[thread overview]
Message-ID: <xmqqa5wrfivc.fsf@gitster.g> (raw)
In-Reply-To: <CAP8UFD30Kx_vYfdV4ipPPXNVr76pKshjTUQGcJfkUvG_+KD3zQ@mail.gmail.com> (Christian Couder's message of "Thu, 22 Jun 2023 10:39:09 +0200")

Christian Couder <christian.couder@gmail.com> writes:

>> I may be missing something, but to me, the above sound more like a
>> tail wagging the dog.
> ...
> This might be a good idea, but what if users prefer to send to a
> promisor remote the objects that should be on that promisor remote as
> soon as possible, instead of keeping them on the local machine where
> they take up possibly valuable space for no good reason?
> ...
> There are some configurations where users never want to delete any git
> object. In those cases it doesn't matter if the promisor remote is a
> "dumping ground".

When one says "everything" in these sentences, I doubt one
necessarily means "everything".  A topic one works on will have
iterations that is never pushed out, a topic one started may not
even get to the state that is pushable to the central server.  But
the objects that need to support such a topic (and its historical
versions in its reflog) would need to be retained until they are
expired.

Certainly, by pushing even such objects, you can say "here is a pack
with filter=blob:none, and because I sent every blob every time I
create locally to the promisor, I can always refetch what is not in
them by definition".

But is that a good use of everybody's resources?  The key phrase in
what I said was "... and still leve the resulting promisor usable".

The promisor remote is in the unfortunate and unenviable position
that it cannot garbage collect anything because there may be
somebody who is still depending on such an object nobody planned to
use, but there is no mechanism to let it find out which ones are in
active use (or if you added some recently that I am forgetting, it
would change the equation---please remind me if that is the case).

So I would imagine that it would be fairly high in the priority list
of server operators and project leads to make sure their promisor
remotes do not become a true "dumping ground".

For "trim a bloated lazy clone" problem, I suspect that you would
need to know what is currently re-fetchable from the promisor and
drop those objects from your local repository, and the computation
of what is currently re-fetchable would certainly involve the filter
specification you had with the promisor.  The remote-tracking
branches you have for the promisor would serve as the other source
of input to perform the computation.

For "partition local and complete object store" problem, using
filter specification to sift the objects into two bins (those that
match and the rest), as the code changes in the series implements,
may be a useful mechansim.  I briefly had to wonder if partitioning
into two (and not arbitrary number N) bins is sufficient, but did
not think of a scenario where we would benefit from 3 bins more than
having 2 bins offhand.

Thanks.

  reply	other threads:[~2023-06-22 18:32 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
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 [this message]
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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