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From: Junio C Hamano <gitster@pobox.com>
To: Christian Couder <christian.couder@gmail.com>
Cc: git@vger.kernel.org, Jeff King <peff@peff.net>,
	Ben Peart <Ben.Peart@microsoft.com>,
	Jonathan Tan <jonathantanmy@google.com>,
	Nguyen Thai Ngoc Duy <pclouds@gmail.com>,
	Mike Hommey <mh@glandium.org>,
	Lars Schneider <larsxschneider@gmail.com>,
	Eric Wong <e@80x24.org>,
	Christian Couder <chriscool@tuxfamily.org>,
	Jeff Hostetler <jeffhost@microsoft.com>
Subject: Re: [PATCH v2 00/36] Promisor remotes and external ODB support
Date: Mon, 19 Mar 2018 12:13:49 -0700	[thread overview]
Message-ID: <xmqqh8pbvpxu.fsf@gitster-ct.c.googlers.com> (raw)
In-Reply-To: <20180319133147.15413-1-chriscool@tuxfamily.org> (Christian Couder's message of "Mon, 19 Mar 2018 14:31:11 +0100")

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

> A lot of things are different because the jh/fsck-promisors and
> jh/partial-clone have been merged into master since the v1. So the
> integration is much more complete now (though not fully complete), and
> this integration happens quite early in the patch series.
>
> This integration makes it possible to have many promisor and partial
> clone remotes (instead of just one) with possibly different partial
> clone filters, though that is not tested yet.
>
> I am not sure that the "external odb" name is still the best, as the
> promisor remotes are not quite external. So I am open to suggestions
> about a new name.

So,... so far we have a way to make an incomplete clone of a project
from a remote that promises that objects (deliberately) missing from
the resulting repository are available later by an on-demand request.

We do not yet have code to actually make an on-demand request, and
the other side of the request to fulfill the promise.  

And that is what these patches want to do?

That sounds like a "lazy backfill" mechanism; I know others are
better in naming things than me, though ;-)

On the other hand, if the code updated with these patches do not
cooperate with the promise mechansim (e.g. request is made to any
missing objects, instead of "this object was promised by that
remote, so let's go there and ask" and "this object is simply
missing, without promise by anybody, so let's not bother the
promisor remote"), then it is not even "back"-filling, but is a
mechanism to access remote object database over a protocol, so
a minimum s/ext/remote/ would clarify what it is.

I guess "lazy backfill" would be more preferrable than a pile of
independent, competing and uncooperative features ;-)

>   - Patches 13/36 and 14/36:
>
> These patches move over the promisor objects and partial clone code to
> use the external odb mechanism. The result of 13/36 is that instead of
> the "extensions.partialclone" config variable, a
> "odb.<name>.promisorRemote" config variable is now used. The result of
> 14/36 is that instead of the "core.partialclonefilter" config
> variable, a "odb.<name>.partialclonefilter" config variable is now
> used.

The use of "extensions" was to protect the repository from versions
of Git that are unaware of the "promise" mechanism to even attempt
touching it.  Will we keep the same degree of safety with these
changes, I wonder?


      parent reply	other threads:[~2018-03-19 19:13 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-19 13:31 Christian Couder
2018-03-19 13:31 ` [PATCH v2 01/36] Add initial external odb support Christian Couder
2018-03-19 13:31 ` [PATCH v2 02/36] sha1_file: add prepare_external_alt_odb() Christian Couder
2018-03-19 13:31 ` [PATCH v2 03/36] Add GIT_NO_EXTERNAL_ODB env variable Christian Couder
2018-03-19 13:31 ` [PATCH v2 04/36] external-odb: add has_external_odb() Christian Couder
2018-03-19 13:31 ` [PATCH v2 05/36] external-odb: implement external_odb_get_direct Christian Couder
2018-03-19 13:31 ` [PATCH v2 06/36] sha1_file: prepare for external odbs Christian Couder
2018-03-19 13:31 ` [PATCH v2 07/36] odb-helper: add 'enum odb_helper_type' Christian Couder
2018-03-19 13:31 ` [PATCH v2 08/36] external-odb: add external_odb_reinit() Christian Couder
2018-03-19 13:31 ` [PATCH v2 09/36] external-odb: add script mode support Christian Couder
2018-03-19 13:31 ` [PATCH v2 10/36] odb-helper: add 'script_mode' to 'struct odb_helper' Christian Couder
2018-03-19 13:31 ` [PATCH v2 11/36] odb-helper: add odb_helper_init() to send 'init' instruction Christian Couder
2018-03-19 13:31 ` [PATCH v2 12/36] external-odb: add external_odb_get_many_direct() Christian Couder
2018-03-19 13:31 ` [PATCH v2 13/36] Use external_odb_get_direct() and has_external_odb() Christian Couder
2018-03-19 13:31 ` [PATCH v2 14/36] Use odb.origin.partialclonefilter instead of core.partialclonefilter Christian Couder
2018-03-19 13:31 ` [PATCH v2 15/36] external-odb: add 'get_direct' support Christian Couder
2018-03-19 13:31 ` [PATCH v2 16/36] t0500: add 'put_raw_obj' instruction to odb-helper script Christian Couder
2018-03-19 13:31 ` [PATCH v2 17/36] external odb: add 'put_raw_obj' support Christian Couder
2018-03-19 13:31 ` [PATCH v2 18/36] external-odb: accept only blobs for now Christian Couder
2018-03-19 13:31 ` [PATCH v2 19/36] t0500: add test for external odb write support Christian Couder
2018-03-19 13:31 ` [PATCH v2 20/36] Add t0510 to test external ODB transfer Christian Couder
2018-03-19 13:31 ` [PATCH v2 21/36] lib-httpd: pass config file to start_httpd() Christian Couder
2018-03-19 13:31 ` [PATCH v2 22/36] lib-httpd: add upload.sh Christian Couder
2018-03-19 13:31 ` [PATCH v2 23/36] lib-httpd: add list.sh Christian Couder
2018-03-19 13:31 ` [PATCH v2 24/36] lib-httpd: add apache-e-odb.conf Christian Couder
2018-03-19 13:31 ` [PATCH v2 25/36] odb-helper: add odb_helper_get_raw_object() Christian Couder
2018-03-19 13:31 ` [PATCH v2 26/36] pack-objects: don't pack objects in external odbs Christian Couder
2018-03-19 13:31 ` [PATCH v2 27/36] Add t0520 to test transfer to HTTP external odb Christian Couder
2018-03-19 13:31 ` [PATCH v2 28/36] odb-helper: add init_object_process() Christian Couder
2018-03-19 13:31 ` [PATCH v2 29/36] Add t0550 to test 'get_direct' mechanism Christian Couder
2018-03-19 13:31 ` [PATCH v2 30/36] Add t0560 to test passing git objects Christian Couder
2018-03-19 13:31 ` [PATCH v2 31/36] odb-helper: add put_object_process() Christian Couder
2018-03-19 13:31 ` [PATCH v2 32/36] Add t0570 to test passing raw objects Christian Couder
2018-03-19 13:31 ` [PATCH v2 33/36] odb-helper: add have_object_process() Christian Couder
2018-03-19 13:31 ` [PATCH v2 34/36] Add t0580 to test "have" capability and raw objects Christian Couder
2018-03-19 13:31 ` [PATCH v2 35/36] external-odb: use 'odb=magic' attribute to mark odb blobs Christian Couder
2018-03-19 13:31 ` [PATCH v2 36/36] Add Documentation/technical/external-odb.txt Christian Couder
2018-03-19 19:13 ` Junio C Hamano [this message]

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