From: "Đoàn Trần Công Danh" <congdanhqx@gmail.com>
To: Derrick Stolee via GitGitGadget <gitgitgadget@gmail.com>
Cc: git@vger.kernel.org, Johannes.Schindelin@gmx.de,
sandals@crustytoothpaste.net, steadmon@google.com,
jrnieder@gmail.com, peff@peff.net, phillip.wood123@gmail.com,
emilyshaffer@google.com, sluongng@gmail.com,
jonathantanmy@google.com,
Derrick Stolee <derrickstolee@github.com>,
Derrick Stolee <dstolee@microsoft.com>
Subject: Re: [PATCH v2 08/18] maintenance: add prefetch task
Date: Sat, 25 Jul 2020 08:37:15 +0700 [thread overview]
Message-ID: <20200725013715.GA2436@danh.dev> (raw)
In-Reply-To: <3165b8916d2d80bf72dac6596a42c871ccd4cbe6.1595527000.git.gitgitgadget@gmail.com>
On 2020-07-23 17:56:30+0000, Derrick Stolee via GitGitGadget <gitgitgadget@gmail.com> wrote:
> From: Derrick Stolee <dstolee@microsoft.com>
>
> When working with very large repositories, an incremental 'git fetch'
> command can download a large amount of data. If there are many other
> users pushing to a common repo, then this data can rival the initial
> pack-file size of a 'git clone' of a medium-size repo.
>
> Users may want to keep the data on their local repos as close as
> possible to the data on the remote repos by fetching periodically in
> the background. This can break up a large daily fetch into several
> smaller hourly fetches.
>
> The task is called "prefetch" because it is work done in advance
> of a foreground fetch to make that 'git fetch' command much faster.
>
> However, if we simply ran 'git fetch <remote>' in the background,
> then the user running a foregroudn 'git fetch <remote>' would lose
> some important feedback when a new branch appears or an existing
> branch updates. This is especially true if a remote branch is
> force-updated and this isn't noticed by the user because it occurred
> in the background. Further, the functionality of 'git push
> --force-with-lease' becomes suspect.
>
> When running 'git fetch <remote> <options>' in the background, use
> the following options for careful updating:
Does this job interfere with FETCH_HEAD?
From my quick test (by applying 01-08 on top of rc1, and messing with t7900),
it looks like yes.
I (and some other people, probably) rely on FETCH_HEAD for our scripts.
Hence, it would be nice to not touch FETCH_HEAD with prefetch job.
Thanks,
-Danh
>
> 1. --no-tags prevents getting a new tag when a user wants to see
> the new tags appear in their foreground fetches.
>
> 2. --refmap= removes the configured refspec which usually updates
> refs/remotes/<remote>/* with the refs advertised by the remote.
>
> 3. By adding a new refspec "+refs/heads/*:refs/prefetch/<remote>/*"
> we can ensure that we actually load the new values somewhere in
> our refspace while not updating refs/heads or refs/remotes. By
> storing these refs here, the commit-graph job will update the
> commit-graph with the commits from these hidden refs.
>
> 4. --prune will delete the refs/prefetch/<remote> refs that no
> longer appear on the remote.
>
> We've been using this step as a critical background job in Scalar
> [1] (and VFS for Git). This solved a pain point that was showing up
> in user reports: fetching was a pain! Users do not like waiting to
> download the data that was created while they were away from their
> machines. After implementing background fetch, the foreground fetch
> commands sped up significantly because they mostly just update refs
> and download a small amount of new data. The effect is especially
> dramatic when paried with --no-show-forced-udpates (through
> fetch.showForcedUpdates=false).
>
> [1] https://github.com/microsoft/scalar/blob/master/Scalar.Common/Maintenance/FetchStep.cs
>
> Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
> ---
> Documentation/git-maintenance.txt | 12 ++++++
> builtin/gc.c | 64 ++++++++++++++++++++++++++++++-
> t/t7900-maintenance.sh | 24 ++++++++++++
> 3 files changed, 99 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/git-maintenance.txt b/Documentation/git-maintenance.txt
> index 9204762e21..0927643247 100644
> --- a/Documentation/git-maintenance.txt
> +++ b/Documentation/git-maintenance.txt
> @@ -53,6 +53,18 @@ since it will not expire `.graph` files that were in the previous
> `commit-graph-chain` file. They will be deleted by a later run based on
> the expiration delay.
>
> +prefetch::
> + The `fetch` task updates the object directory with the latest objects
> + from all registered remotes. For each remote, a `git fetch` command
> + is run. The refmap is custom to avoid updating local or remote
> + branches (those in `refs/heads` or `refs/remotes`). Instead, the
> + remote refs are stored in `refs/prefetch/<remote>/`. Also, tags are
> + not updated.
> ++
> +This means that foreground fetches are still required to update the
> +remote refs, but the users is notified when the branches and tags are
> +updated on the remote.
> +
> gc::
> Cleanup unnecessary files and optimize the local repository. "GC"
> stands for "garbage collection," but this task performs many
> diff --git a/builtin/gc.c b/builtin/gc.c
> index 5d99b4b805..969c127877 100644
> --- a/builtin/gc.c
> +++ b/builtin/gc.c
> @@ -28,6 +28,7 @@
> #include "blob.h"
> #include "tree.h"
> #include "promisor-remote.h"
> +#include "remote.h"
>
> #define FAILED_RUN "failed to run %s"
>
> @@ -700,7 +701,7 @@ int cmd_gc(int argc, const char **argv, const char *prefix)
> return 0;
> }
>
> -#define MAX_NUM_TASKS 2
> +#define MAX_NUM_TASKS 3
>
> static const char * const builtin_maintenance_usage[] = {
> N_("git maintenance run [<options>]"),
> @@ -781,6 +782,63 @@ static int maintenance_task_commit_graph(void)
> return 1;
> }
>
> +static int fetch_remote(const char *remote)
> +{
> + int result;
> + struct argv_array cmd = ARGV_ARRAY_INIT;
> + struct strbuf refmap = STRBUF_INIT;
> +
> + argv_array_pushl(&cmd, "fetch", remote, "--prune",
> + "--no-tags", "--refmap=", NULL);
> +
> + strbuf_addf(&refmap, "+refs/heads/*:refs/prefetch/%s/*", remote);
> + argv_array_push(&cmd, refmap.buf);
> +
> + if (opts.quiet)
> + argv_array_push(&cmd, "--quiet");
> +
> + result = run_command_v_opt(cmd.argv, RUN_GIT_CMD);
> +
> + strbuf_release(&refmap);
> + return result;
> +}
> +
> +static int fill_each_remote(struct remote *remote, void *cbdata)
> +{
> + struct string_list *remotes = (struct string_list *)cbdata;
> +
> + string_list_append(remotes, remote->name);
> + return 0;
> +}
> +
> +static int maintenance_task_prefetch(void)
> +{
> + int result = 0;
> + struct string_list_item *item;
> + struct string_list remotes = STRING_LIST_INIT_DUP;
> +
> + if (for_each_remote(fill_each_remote, &remotes)) {
> + error(_("failed to fill remotes"));
> + result = 1;
> + goto cleanup;
> + }
> +
> + /*
> + * Do not modify the result based on the success of the 'fetch'
> + * operation, as a loss of network could cause 'fetch' to fail
> + * quickly. We do not want that to stop the rest of our
> + * background operations.
> + */
> + for (item = remotes.items;
> + item && item < remotes.items + remotes.nr;
> + item++)
> + fetch_remote(item->string);
> +
> +cleanup:
> + string_list_clear(&remotes, 0);
> + return result;
> +}
> +
> static int maintenance_task_gc(void)
> {
> int result;
> @@ -871,6 +929,10 @@ static void initialize_tasks(void)
> for (i = 0; i < MAX_NUM_TASKS; i++)
> tasks[i] = xcalloc(1, sizeof(struct maintenance_task));
>
> + tasks[num_tasks]->name = "prefetch";
> + tasks[num_tasks]->fn = maintenance_task_prefetch;
> + num_tasks++;
> +
> tasks[num_tasks]->name = "gc";
> tasks[num_tasks]->fn = maintenance_task_gc;
> tasks[num_tasks]->enabled = 1;
> diff --git a/t/t7900-maintenance.sh b/t/t7900-maintenance.sh
> index c09a9eb90b..8b04a04c79 100755
> --- a/t/t7900-maintenance.sh
> +++ b/t/t7900-maintenance.sh
> @@ -44,4 +44,28 @@ test_expect_success 'run --task duplicate' '
> test_i18ngrep "cannot be selected multiple times" err
> '
>
> +test_expect_success 'run --task=prefetch with no remotes' '
> + git maintenance run --task=prefetch 2>err &&
> + test_must_be_empty err
> +'
> +
> +test_expect_success 'prefetch multiple remotes' '
> + git clone . clone1 &&
> + git clone . clone2 &&
> + git remote add remote1 "file://$(pwd)/clone1" &&
> + git remote add remote2 "file://$(pwd)/clone2" &&
> + git -C clone1 switch -c one &&
> + git -C clone2 switch -c two &&
> + test_commit -C clone1 one &&
> + test_commit -C clone2 two &&
> + GIT_TRACE2_EVENT="$(pwd)/run-prefetch.txt" git maintenance run --task=prefetch &&
> + grep ",\"fetch\",\"remote1\"" run-prefetch.txt &&
> + grep ",\"fetch\",\"remote2\"" run-prefetch.txt &&
> + test_path_is_missing .git/refs/remotes &&
> + test_cmp clone1/.git/refs/heads/one .git/refs/prefetch/remote1/one &&
> + test_cmp clone2/.git/refs/heads/two .git/refs/prefetch/remote2/two &&
> + git log prefetch/remote1/one &&
> + git log prefetch/remote2/two
> +'
> +
> test_done
> --
> gitgitgadget
>
--
Danh
next prev parent reply other threads:[~2020-07-25 1:37 UTC|newest]
Thread overview: 164+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-07 14:21 [PATCH 00/21] Maintenance builtin, allowing 'gc --auto' customization Derrick Stolee via GitGitGadget
2020-07-07 14:21 ` [PATCH 01/21] gc: use the_repository less often Derrick Stolee via GitGitGadget
2020-07-07 14:21 ` [PATCH 02/21] gc: use repository in too_many_loose_objects() Derrick Stolee via GitGitGadget
2020-07-07 14:21 ` [PATCH 03/21] gc: use repo config Derrick Stolee via GitGitGadget
2020-07-07 14:21 ` [PATCH 04/21] gc: drop the_repository in log location Derrick Stolee via GitGitGadget
2020-07-09 2:22 ` Jonathan Tan
2020-07-09 11:13 ` Derrick Stolee
2020-07-07 14:21 ` [PATCH 05/21] maintenance: create basic maintenance runner Derrick Stolee via GitGitGadget
2020-07-07 14:21 ` [PATCH 06/21] maintenance: add --quiet option Derrick Stolee via GitGitGadget
2020-07-07 14:21 ` [PATCH 07/21] maintenance: replace run_auto_gc() Derrick Stolee via GitGitGadget
2020-07-07 14:21 ` [PATCH 08/21] maintenance: initialize task array and hashmap Derrick Stolee via GitGitGadget
2020-07-09 2:25 ` Jonathan Tan
2020-07-09 13:15 ` Derrick Stolee
2020-07-09 13:51 ` Junio C Hamano
2020-07-07 14:21 ` [PATCH 09/21] maintenance: add commit-graph task Derrick Stolee via GitGitGadget
2020-07-09 2:29 ` Jonathan Tan
2020-07-09 11:14 ` Derrick Stolee
2020-07-09 22:52 ` Jeff King
2020-07-09 23:41 ` Derrick Stolee
2020-07-07 14:21 ` [PATCH 10/21] maintenance: add --task option Derrick Stolee via GitGitGadget
2020-07-07 14:21 ` [PATCH 11/21] maintenance: take a lock on the objects directory Derrick Stolee via GitGitGadget
2020-07-07 14:21 ` [PATCH 12/21] maintenance: add fetch task Derrick Stolee via GitGitGadget
2020-07-09 2:35 ` Jonathan Tan
2020-07-07 14:21 ` [PATCH 13/21] maintenance: add loose-objects task Derrick Stolee via GitGitGadget
2020-07-07 14:21 ` [PATCH 14/21] maintenance: add pack-files task Derrick Stolee via GitGitGadget
2020-07-07 14:21 ` [PATCH 15/21] maintenance: auto-size pack-files batch Derrick Stolee via GitGitGadget
2020-07-07 14:21 ` [PATCH 16/21] maintenance: create maintenance.<task>.enabled config Derrick Stolee via GitGitGadget
2020-07-07 14:21 ` [PATCH 17/21] maintenance: use pointers to check --auto Derrick Stolee via GitGitGadget
2020-07-07 14:21 ` [PATCH 18/21] maintenance: add auto condition for commit-graph task Derrick Stolee via GitGitGadget
2020-07-07 14:21 ` [PATCH 19/21] maintenance: create auto condition for loose-objects Derrick Stolee via GitGitGadget
2020-07-07 14:21 ` [PATCH 20/21] maintenance: add pack-files auto condition Derrick Stolee via GitGitGadget
2020-07-07 14:21 ` [PATCH 21/21] midx: use start_delayed_progress() Derrick Stolee via GitGitGadget
2020-07-08 23:57 ` [PATCH 00/21] Maintenance builtin, allowing 'gc --auto' customization Emily Shaffer
2020-07-09 11:21 ` Derrick Stolee
2020-07-09 12:43 ` Derrick Stolee
2020-07-09 23:16 ` Jeff King
2020-07-09 23:45 ` Derrick Stolee
2020-07-10 18:46 ` Emily Shaffer
2020-07-10 19:30 ` Son Luong Ngoc
2020-07-09 14:05 ` Junio C Hamano
2020-07-09 15:54 ` Derrick Stolee
2020-07-09 16:26 ` Junio C Hamano
2020-07-09 16:56 ` Derrick Stolee
2020-07-23 17:56 ` [PATCH v2 00/18] " Derrick Stolee via GitGitGadget
2020-07-23 17:56 ` [PATCH v2 01/18] maintenance: create basic maintenance runner Derrick Stolee via GitGitGadget
2020-07-25 1:26 ` Taylor Blau
2020-07-25 1:47 ` Đoàn Trần Công Danh
2020-07-29 22:19 ` Jonathan Nieder
2020-07-30 13:12 ` Derrick Stolee
2020-07-31 0:30 ` Jonathan Nieder
2020-08-03 17:37 ` Derrick Stolee
2020-08-03 17:46 ` Jonathan Nieder
2020-08-03 22:46 ` Taylor Blau
2020-08-03 23:01 ` Jonathan Nieder
2020-08-03 23:08 ` Taylor Blau
2020-08-03 23:17 ` Jonathan Nieder
2020-08-04 0:07 ` Junio C Hamano
2020-08-04 13:32 ` Derrick Stolee
2020-08-04 14:42 ` Jonathan Nieder
2020-08-04 16:32 ` Derrick Stolee
2020-08-04 17:02 ` Jonathan Nieder
2020-08-04 17:51 ` Derrick Stolee
2020-08-05 15:02 ` Derrick Stolee
2020-07-31 16:40 ` Jonathan Nieder
2020-08-03 23:52 ` Jonathan Nieder
2020-07-23 17:56 ` [PATCH v2 02/18] maintenance: add --quiet option Derrick Stolee via GitGitGadget
2020-07-23 17:56 ` [PATCH v2 03/18] maintenance: replace run_auto_gc() Derrick Stolee via GitGitGadget
2020-07-23 20:21 ` Junio C Hamano
2020-07-25 1:33 ` Taylor Blau
2020-07-30 13:29 ` Derrick Stolee
2020-07-30 13:31 ` Derrick Stolee
2020-07-30 19:00 ` Eric Sunshine
2020-07-30 20:21 ` Derrick Stolee
2020-07-23 17:56 ` [PATCH v2 04/18] maintenance: initialize task array Derrick Stolee via GitGitGadget
2020-07-23 19:57 ` Junio C Hamano
2020-07-24 12:23 ` Derrick Stolee
2020-07-24 12:51 ` Derrick Stolee
2020-07-24 19:39 ` Junio C Hamano
2020-07-25 1:46 ` Taylor Blau
2020-07-29 22:19 ` Emily Shaffer
2020-07-23 17:56 ` [PATCH v2 05/18] maintenance: add commit-graph task Derrick Stolee via GitGitGadget
2020-07-23 20:22 ` Junio C Hamano
2020-07-24 13:09 ` Derrick Stolee
2020-07-24 19:47 ` Junio C Hamano
2020-07-25 1:52 ` Taylor Blau
2020-07-30 13:59 ` Derrick Stolee
2020-07-29 0:22 ` Jeff King
2020-07-23 17:56 ` [PATCH v2 06/18] maintenance: add --task option Derrick Stolee via GitGitGadget
2020-07-23 20:21 ` Junio C Hamano
2020-07-23 22:18 ` Junio C Hamano
2020-07-24 13:36 ` Derrick Stolee
2020-07-24 19:50 ` Junio C Hamano
2020-07-23 17:56 ` [PATCH v2 07/18] maintenance: take a lock on the objects directory Derrick Stolee via GitGitGadget
2020-07-23 17:56 ` [PATCH v2 08/18] maintenance: add prefetch task Derrick Stolee via GitGitGadget
2020-07-23 20:53 ` Junio C Hamano
2020-07-24 14:25 ` Derrick Stolee
2020-07-24 20:47 ` Junio C Hamano
2020-07-25 1:37 ` Đoàn Trần Công Danh [this message]
2020-07-25 1:48 ` Junio C Hamano
2020-07-27 14:07 ` Derrick Stolee
2020-07-27 16:13 ` Junio C Hamano
2020-07-27 18:27 ` Derrick Stolee
2020-07-28 16:37 ` [PATCH v2] fetch: optionally allow disabling FETCH_HEAD update Junio C Hamano
2020-07-29 9:12 ` Phillip Wood
2020-07-29 9:17 ` Phillip Wood
2020-07-30 15:17 ` Derrick Stolee
2020-07-23 17:56 ` [PATCH v2 09/18] maintenance: add loose-objects task Derrick Stolee via GitGitGadget
2020-07-23 20:59 ` Junio C Hamano
2020-07-24 14:50 ` Derrick Stolee
2020-07-24 19:57 ` Junio C Hamano
2020-07-29 22:21 ` Emily Shaffer
2020-07-30 15:38 ` Derrick Stolee
2020-07-23 17:56 ` [PATCH v2 10/18] maintenance: add incremental-repack task Derrick Stolee via GitGitGadget
2020-07-23 22:00 ` Junio C Hamano
2020-07-24 15:03 ` Derrick Stolee
2020-07-29 22:22 ` Emily Shaffer
2020-07-23 17:56 ` [PATCH v2 11/18] maintenance: auto-size incremental-repack batch Derrick Stolee via GitGitGadget
2020-07-23 22:15 ` Junio C Hamano
2020-07-23 23:09 ` Eric Sunshine
2020-07-23 23:24 ` Junio C Hamano
2020-07-24 16:09 ` Derrick Stolee
2020-07-24 19:51 ` Derrick Stolee
2020-07-24 20:17 ` Junio C Hamano
2020-07-29 22:23 ` Emily Shaffer
2020-07-30 16:57 ` Derrick Stolee
2020-07-30 19:02 ` Derrick Stolee
2020-07-30 19:24 ` Chris Torek
2020-08-05 12:37 ` Đoàn Trần Công Danh
2020-08-06 13:54 ` Derrick Stolee
2020-07-23 17:56 ` [PATCH v2 12/18] maintenance: create maintenance.<task>.enabled config Derrick Stolee via GitGitGadget
2020-07-23 17:56 ` [PATCH v2 13/18] maintenance: use pointers to check --auto Derrick Stolee via GitGitGadget
2020-07-23 17:56 ` [PATCH v2 14/18] maintenance: add auto condition for commit-graph task Derrick Stolee via GitGitGadget
2020-07-23 17:56 ` [PATCH v2 15/18] maintenance: create auto condition for loose-objects Derrick Stolee via GitGitGadget
2020-07-23 17:56 ` [PATCH v2 16/18] maintenance: add incremental-repack auto condition Derrick Stolee via GitGitGadget
2020-07-23 17:56 ` [PATCH v2 17/18] midx: use start_delayed_progress() Derrick Stolee via GitGitGadget
2020-07-23 17:56 ` [PATCH v2 18/18] maintenance: add trace2 regions for task execution Derrick Stolee via GitGitGadget
2020-07-29 22:03 ` [PATCH v2 00/18] Maintenance builtin, allowing 'gc --auto' customization Emily Shaffer
2020-07-30 22:24 ` [PATCH v3 00/20] " Derrick Stolee via GitGitGadget
2020-07-30 22:24 ` [PATCH v3 01/20] maintenance: create basic maintenance runner Derrick Stolee via GitGitGadget
2020-07-30 22:24 ` [PATCH v3 02/20] maintenance: add --quiet option Derrick Stolee via GitGitGadget
2020-07-30 22:24 ` [PATCH v3 03/20] maintenance: replace run_auto_gc() Derrick Stolee via GitGitGadget
2020-07-30 22:24 ` [PATCH v3 04/20] maintenance: initialize task array Derrick Stolee via GitGitGadget
2020-07-30 22:24 ` [PATCH v3 05/20] maintenance: add commit-graph task Derrick Stolee via GitGitGadget
2020-07-30 22:24 ` [PATCH v3 06/20] maintenance: add --task option Derrick Stolee via GitGitGadget
2020-07-30 22:24 ` [PATCH v3 07/20] maintenance: take a lock on the objects directory Derrick Stolee via GitGitGadget
2020-07-30 22:24 ` [PATCH v3 08/20] fetch: optionally allow disabling FETCH_HEAD update Junio C Hamano via GitGitGadget
2020-07-30 22:24 ` [PATCH v3 09/20] maintenance: add prefetch task Derrick Stolee via GitGitGadget
2020-07-30 22:24 ` [PATCH v3 10/20] maintenance: add loose-objects task Derrick Stolee via GitGitGadget
2020-07-30 22:24 ` [PATCH v3 11/20] midx: enable core.multiPackIndex by default Derrick Stolee via GitGitGadget
2020-07-30 22:24 ` [PATCH v3 12/20] maintenance: add incremental-repack task Derrick Stolee via GitGitGadget
2020-07-30 22:24 ` [PATCH v3 13/20] maintenance: auto-size incremental-repack batch Derrick Stolee via GitGitGadget
2020-07-30 23:36 ` Chris Torek
2020-08-03 17:43 ` Derrick Stolee
2020-07-30 22:24 ` [PATCH v3 14/20] maintenance: create maintenance.<task>.enabled config Derrick Stolee via GitGitGadget
2020-07-30 22:24 ` [PATCH v3 15/20] maintenance: use pointers to check --auto Derrick Stolee via GitGitGadget
2020-07-30 22:24 ` [PATCH v3 16/20] maintenance: add auto condition for commit-graph task Derrick Stolee via GitGitGadget
2020-07-30 22:24 ` [PATCH v3 17/20] maintenance: create auto condition for loose-objects Derrick Stolee via GitGitGadget
2020-07-30 22:24 ` [PATCH v3 18/20] maintenance: add incremental-repack auto condition Derrick Stolee via GitGitGadget
2020-07-30 22:24 ` [PATCH v3 19/20] midx: use start_delayed_progress() Derrick Stolee via GitGitGadget
2020-07-30 22:24 ` [PATCH v3 20/20] maintenance: add trace2 regions for task execution Derrick Stolee via GitGitGadget
2020-07-30 23:06 ` [PATCH v3 00/20] Maintenance builtin, allowing 'gc --auto' customization Junio C Hamano
2020-07-30 23:31 ` Junio C Hamano
2020-07-31 2:58 ` Junio C Hamano
2020-08-06 17:58 ` Derrick Stolee
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