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From: Junio C Hamano <gitster@pobox.com>
To: Phillip Wood <phillip.wood123@gmail.com>
Cc: Derrick Stolee via GitGitGadget <gitgitgadget@gmail.com>,
	git@vger.kernel.org, peff@peff.net, jrnieder@google.com,
	stolee@gmail.com, Derrick Stolee <dstolee@microsoft.com>
Subject: Re: [PATCH 01/15] run-job: create barebones builtin
Date: Sun, 05 Apr 2020 12:21:41 -0700	[thread overview]
Message-ID: <xmqqimidybzu.fsf@gitster.c.googlers.com> (raw)
In-Reply-To: <fc5e6823-ebb3-df58-d7fc-6fb2b58cffe8@gmail.com> (Phillip Wood's message of "Sun, 5 Apr 2020 16:10:01 +0100")

Phillip Wood <phillip.wood123@gmail.com> writes:

> Hi Stolee
>
> On 03/04/2020 21:48, Derrick Stolee via GitGitGadget wrote:
>> From: Derrick Stolee <dstolee@microsoft.com>
>>
>> The 'git run-job' command will be used to execute a short-lived set
>> of maintenance activities by a background job manager. The intention
>> is to perform small batches of work that reduce the foreground time
>> taken by repository maintenance such as 'git gc --auto'.
>>
>> This change does the absolute minimum to create the builtin and show
>> the usage output.
>>
>> Provide an explicit warning that this command is experimental. The
>> set of jobs may change, and each job could alter its behavior in
>> future versions.
>>
>> RFC QUESTION: This builtin is based on the background maintenance in
>> Scalar. Specifically, this builtin is based on the "scalar run <job>"
>> command [1] [2]. My default thought was to make this a "git run <job>"
>> command to maximize similarity. However, it seems like "git run" is
>> too generic. Or, am I being overly verbose for no reason?
>
> Having read through this series I wondered if we wanted a single git
> command such as 'git maintenance' (suggestions of better names
> welcome) and then 'git run-job' could become 'git maintenance run',
> 'git job-runner' would become another subcommand (run-jobs or
> schedule-jobs?) and the 'git please-run-maintenance-on-this-repo' you
> mentioned in you email to Junio could become 'git maintenance init'
> (or maybe setup)

I had a very similar impression.  In addition to what you already
said, a few more were:

 - Why the existing "git repack" isn't such "maintenance" command?
   IOW why do we even need [01/15]?  After all, "repack" may have
   started its life as a tool to reorganize the PACKFILES, but it is
   no longer limited to 'git/objects/pack/*.pack' files with its
   knowledge about the loose object files and the "--prune" option.
   Consolidating pieces of information spread across multiple .idx
   files, reachability bitmaps and commit graph files, into a newer
   and more performant forms can just be part of "packing the pieces
   of information in a repository for optimum performance", which is
   a better way to understand why "repack" has a word 'pack' in its
   name.

 - Many of the "maintenance" operations this series proposes do make
   sense, just like other "maintenance" operations we already have
   in "repack", "prune", "prune-packed" etc., which are welcome
   additions. 

 - Like the individual steps that appear in e.g. "repack", however,
   some of the individual steps in this series can be triggered by
   calling underlying tools directly, allowing scripted maintenance
   commands that suit individual needs better than the canned
   invocation of "run-job", but I didn't get the impression that the
   series strives to make sure that all knobs of these individual
   steps are available to scripters who want to deviate from what
   "run-job" prescribes.  If it is not doing so, we probably should.

 - Again, I do not think we want a reimplementation of cron, at or
   inetd that is not specific to "git" at all.

Thanks.

  reply	other threads:[~2020-04-05 19:21 UTC|newest]

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-03 20:47 [PATCH 00/15] [RFC] Maintenance jobs and job runner Derrick Stolee via GitGitGadget
2020-04-03 20:48 ` [PATCH 01/15] run-job: create barebones builtin Derrick Stolee via GitGitGadget
2020-04-05 15:10   ` Phillip Wood
2020-04-05 19:21     ` Junio C Hamano [this message]
2020-04-06 14:42       ` Derrick Stolee
2020-04-07  0:58         ` Danh Doan
2020-04-07 10:54           ` Derrick Stolee
2020-04-07 14:16             ` Danh Doan
2020-04-07 14:30               ` Johannes Schindelin
2020-04-03 20:48 ` [PATCH 02/15] run-job: implement commit-graph job Derrick Stolee via GitGitGadget
2020-05-20 19:08   ` Josh Steadmon
2020-04-03 20:48 ` [PATCH 03/15] run-job: implement fetch job Derrick Stolee via GitGitGadget
2020-04-05 15:14   ` Phillip Wood
2020-04-06 12:48     ` Derrick Stolee
2020-04-05 20:28   ` Junio C Hamano
2020-04-06 12:46     ` Derrick Stolee
2020-05-20 19:08   ` Josh Steadmon
2020-04-03 20:48 ` [PATCH 04/15] run-job: implement loose-objects job Derrick Stolee via GitGitGadget
2020-04-05 20:33   ` Junio C Hamano
2020-04-03 20:48 ` [PATCH 05/15] run-job: implement pack-files job Derrick Stolee via GitGitGadget
2020-05-27 22:17   ` Josh Steadmon
2020-04-03 20:48 ` [PATCH 06/15] run-job: auto-size or use custom pack-files batch Derrick Stolee via GitGitGadget
2020-04-03 20:48 ` [PATCH 07/15] config: add job.pack-files.batchSize option Derrick Stolee via GitGitGadget
2020-04-03 20:48 ` [PATCH 08/15] job-runner: create builtin for job loop Derrick Stolee via GitGitGadget
2020-04-03 20:48 ` [PATCH 09/15] job-runner: load repos from config by default Derrick Stolee via GitGitGadget
2020-04-05 15:18   ` Phillip Wood
2020-04-06 12:49     ` Derrick Stolee
2020-04-05 15:41   ` Phillip Wood
2020-04-06 12:57     ` Derrick Stolee
2020-04-03 20:48 ` [PATCH 10/15] job-runner: use config to limit job frequency Derrick Stolee via GitGitGadget
2020-04-05 15:24   ` Phillip Wood
2020-04-03 20:48 ` [PATCH 11/15] job-runner: use config for loop interval Derrick Stolee via GitGitGadget
2020-04-03 20:48 ` [PATCH 12/15] job-runner: add --interval=<span> option Derrick Stolee via GitGitGadget
2020-04-03 20:48 ` [PATCH 13/15] job-runner: skip a job if job.<job-name>.enabled is false Derrick Stolee via GitGitGadget
2020-04-03 20:48 ` [PATCH 14/15] job-runner: add --daemonize option Derrick Stolee via GitGitGadget
2020-04-03 20:48 ` [PATCH 15/15] runjob: customize the loose-objects batch size Derrick Stolee via GitGitGadget
2020-04-03 21:40 ` [PATCH 00/15] [RFC] Maintenance jobs and job runner Junio C Hamano
2020-04-04  0:16   ` Derrick Stolee
2020-04-07  0:50     ` Danh Doan
2020-04-07 10:59       ` Derrick Stolee
2020-04-07 14:26         ` Danh Doan
2020-04-07 14:43           ` Johannes Schindelin
2020-04-07  1:48     ` brian m. carlson
2020-04-07 20:08       ` Junio C Hamano
2020-04-07 22:23       ` Johannes Schindelin
2020-04-08  0:01         ` brian m. carlson
2020-05-27 22:39           ` Josh Steadmon
2020-05-28  0:47             ` Junio C Hamano
2020-05-27 21:52               ` Johannes Schindelin
2020-05-28 14:48                 ` Junio C Hamano
2020-05-28 14:50                 ` Jonathan Nieder
2020-05-28 14:57                   ` Junio C Hamano
2020-05-28 15:03                     ` Jonathan Nieder
2020-05-28 15:30                       ` Derrick Stolee
2020-05-28  4:39                         ` Johannes Schindelin

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