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From: Jeff Hostetler <git@jeffhostetler.com>
To: Christian Couder <christian.couder@gmail.com>, git@vger.kernel.org
Cc: Junio C Hamano <gitster@pobox.com>, 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 28/40] pack-objects: don't pack objects in external odbs
Date: Thu, 4 Jan 2018 15:54:05 -0500	[thread overview]
Message-ID: <8de3597a-01bd-a721-fffb-20769701d0af@jeffhostetler.com> (raw)
In-Reply-To: <20180103163403.11303-29-chriscool@tuxfamily.org>



On 1/3/2018 11:33 AM, Christian Couder wrote:
> Objects managed by an external ODB should not be put into
> pack files. They should be transfered using other mechanism
> that can be specific to the external odb.
> 
> Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
> ---
>   builtin/pack-objects.c | 4 ++++
>   1 file changed, 4 insertions(+)
> 
> diff --git a/builtin/pack-objects.c b/builtin/pack-objects.c
> index 6c71552cdf..4ed66c7677 100644
> --- a/builtin/pack-objects.c
> +++ b/builtin/pack-objects.c
> @@ -28,6 +28,7 @@
>   #include "argv-array.h"
>   #include "mru.h"
>   #include "packfile.h"
> +#include "external-odb.h"
>   
>   static const char *pack_usage[] = {
>   	N_("git pack-objects --stdout [<options>...] [< <ref-list> | < <object-list>]"),
> @@ -1026,6 +1027,9 @@ static int want_object_in_pack(const struct object_id *oid,
>   			return want;
>   	}
>   
> +	if (external_odb_has_object(oid->hash))
> +		return 0;
> +

I worry about the performance of this in light of my comments
earlier in the patch series about the expense of building the
"have" sets.

Since we've already checked for a loose object and we are about
to walk thru the local packfiles, so if we don't find it in any
of them, then we don't have it locally.  Only then do we need
to worry about external odbs.

If we don't have it locally, does the caller of this function
have sufficient "promisor" infomation infer that the object
should exist on the promisor remote?   Since you're going to
omit it from the packfile anyway, you don't really need to know
if the remote actually has it.


>   	for (entry = packed_git_mru.head; entry; entry = entry->next) {
>   		struct packed_git *p = entry->item;
>   		off_t offset;
> 

Jeff

  reply	other threads:[~2018-01-04 20:54 UTC|newest]

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-01-03 16:33 [PATCH 00/40] Promisor remotes and external ODB support Christian Couder
2018-01-03 16:33 ` [PATCH 01/40] Add initial external odb support Christian Couder
2018-01-04 19:59   ` Jeff Hostetler
2018-01-15 14:34     ` Christian Couder
2018-01-03 16:33 ` [PATCH 02/40] Add GIT_NO_EXTERNAL_ODB env variable Christian Couder
2018-01-03 16:33 ` [PATCH 03/40] external-odb: add has_external_odb() Christian Couder
2018-01-03 16:33 ` [PATCH 04/40] fsck: introduce promisor objects Christian Couder
2018-01-03 16:33 ` [PATCH 05/40] fsck: support refs pointing to " Christian Couder
2018-01-03 16:33 ` [PATCH 06/40] fsck: support referenced " Christian Couder
2018-01-03 16:33 ` [PATCH 07/40] fsck: support promisor objects as CLI argument Christian Couder
2018-01-03 16:33 ` [PATCH 08/40] index-pack: refactor writing of .keep files Christian Couder
2018-01-03 16:33 ` [PATCH 09/40] introduce fetch-object: fetch one promisor object Christian Couder
2018-01-03 16:33 ` [PATCH 10/40] external-odb: implement external_odb_get_direct Christian Couder
2018-01-04 17:44   ` Jeff Hostetler
2018-01-15 14:47     ` Christian Couder
2018-01-03 16:33 ` [PATCH 11/40] sha1_file: support lazily fetching missing objects Christian Couder
2018-01-03 16:33 ` [PATCH 12/40] rev-list: support termination at promisor objects Christian Couder
2018-01-03 16:33 ` [PATCH 13/40] gc: do not repack promisor packfiles Christian Couder
2018-01-03 16:33 ` [PATCH 14/40] sha1_file: prepare for external odbs Christian Couder
2018-01-04 18:00   ` Jeff Hostetler
2018-01-16  7:23     ` Christian Couder
2018-01-03 16:33 ` [PATCH 15/40] external-odb: add script mode support Christian Couder
2018-01-04 19:55   ` Jeff Hostetler
2018-03-19 13:15     ` Christian Couder
2018-01-03 16:33 ` [PATCH 16/40] odb-helper: add 'enum odb_helper_type' Christian Couder
2018-01-03 16:33 ` [PATCH 17/40] odb-helper: add odb_helper_init() to send 'init' instruction Christian Couder
2018-01-03 16:33 ` [PATCH 18/40] t0400: add 'put_raw_obj' instruction to odb-helper script Christian Couder
2018-01-03 16:33 ` [PATCH 19/40] external odb: add 'put_raw_obj' support Christian Couder
2018-01-03 16:33 ` [PATCH 20/40] external-odb: accept only blobs for now Christian Couder
2018-01-03 16:33 ` [PATCH 21/40] t0400: add test for external odb write support Christian Couder
2018-01-03 16:33 ` [PATCH 22/40] Add t0410 to test external ODB transfer Christian Couder
2018-01-03 16:33 ` [PATCH 23/40] lib-httpd: pass config file to start_httpd() Christian Couder
2018-01-03 16:33 ` [PATCH 24/40] lib-httpd: add upload.sh Christian Couder
2018-01-03 16:33 ` [PATCH 25/40] lib-httpd: add list.sh Christian Couder
2018-01-03 16:33 ` [PATCH 26/40] lib-httpd: add apache-e-odb.conf Christian Couder
2018-01-03 16:33 ` [PATCH 27/40] odb-helper: add odb_helper_get_raw_object() Christian Couder
2018-01-03 16:33 ` [PATCH 28/40] pack-objects: don't pack objects in external odbs Christian Couder
2018-01-04 20:54   ` Jeff Hostetler [this message]
2018-03-19 13:27     ` Christian Couder
2018-01-03 16:33 ` [PATCH 29/40] Add t0420 to test transfer to HTTP external odb Christian Couder
2018-01-03 16:33 ` [PATCH 30/40] external-odb: add 'get_direct' support Christian Couder
2018-01-03 16:33 ` [PATCH 31/40] odb-helper: add 'script_mode' to 'struct odb_helper' Christian Couder
2018-01-03 16:33 ` [PATCH 32/40] odb-helper: add init_object_process() Christian Couder
2018-01-03 16:33 ` [PATCH 33/40] Add t0450 to test 'get_direct' mechanism Christian Couder
2018-01-03 16:33 ` [PATCH 34/40] Add t0460 to test passing git objects Christian Couder
2018-01-03 16:33 ` [PATCH 35/40] odb-helper: add put_object_process() Christian Couder
2018-01-03 16:33 ` [PATCH 36/40] Add t0470 to test passing raw objects Christian Couder
2018-01-03 16:34 ` [PATCH 37/40] odb-helper: add have_object_process() Christian Couder
2018-01-03 16:34 ` [PATCH 38/40] Add t0480 to test "have" capability and raw objects Christian Couder
2018-01-03 16:34 ` [PATCH 39/40] external-odb: use 'odb=magic' attribute to mark odb blobs Christian Couder
2018-01-03 16:34 ` [PATCH 40/40] Add Documentation/technical/external-odb.txt Christian Couder

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