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From: Taylor Blau <me@ttaylorr.com>
To: Teng Long <dyroneteng@gmail.com>
Cc: avarab@gmail.com, derrickstolee@github.com, git@vger.kernel.org,
	tenglong.tl@alibaba-inc.com
Subject: Re: [PATCH v1 1/3] pack-bitmap.c: use "ret" in "open_midx_bitmap()
Date: Tue, 29 Mar 2022 22:39:01 -0400	[thread overview]
Message-ID: <YkPCxRDelmwpdey3@nand.local> (raw)
In-Reply-To: <20220328075907.75529-1-dyroneteng@gmail.com>

On Mon, Mar 28, 2022 at 03:59:07PM +0800, Teng Long wrote:
> Although all MIDX bitmap are scanned, only one of them will eventually work
> , and there seems to be no guarantee that the last MIDX that works is the
> most appropriate one? (with the same comfusion applies to non-MIDX
> bitmap's behavour...)

I think your "which is the most appropriate one?" exactly highlights the
problem. Since Git can only handle one .bitmap file at a time, we should
tell the user when we found more than one candidate.

In this case, they may be expecting or depending on a particular choice
for performance reasons, and so may be rather surprised or upset if Git
chose a different available .bitmap.

The one exception to this is when we have both a single- and multi-pack
bitmap available, in which case it almost always makes more sense to
pick the multi-pack bitmap. So we don't complain in this case (i.e., if
open_midx_bitmap() succeeds, we immediately return success from
open_bitmap() and proceed to have prepare_bitmap_git() call
load_bitmap() on the previous result without even bothering to check for
pack bitmaps).

Thanks,
Taylor

  reply	other threads:[~2022-03-30  2:39 UTC|newest]

Thread overview: 68+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-24 11:43 [PATCH v1 0/3] trace2 output for bitmap decision path Teng Long
2022-03-24 11:43 ` [PATCH v1 1/3] pack-bitmap.c: use "ret" in "open_midx_bitmap()" Teng Long
2022-03-24 19:11   ` Taylor Blau
2022-03-28  7:59     ` [PATCH v1 1/3] pack-bitmap.c: use "ret" in "open_midx_bitmap() Teng Long
2022-03-30  2:39       ` Taylor Blau [this message]
2022-03-24 11:44 ` [PATCH v1 2/3] pack-bitmap.c: add "break" statement in "open_pack_bitmap()" Teng Long
2022-03-24 18:40   ` Junio C Hamano
2022-03-24 19:06     ` Taylor Blau
2022-03-24 19:03   ` Taylor Blau
2022-03-29  2:49     ` Teng Long
2022-03-30  2:55       ` Taylor Blau
2022-03-30  7:32         ` Teng Long Teng Long
2022-03-30 13:17           ` Ævar Arnfjörð Bjarmason
2022-03-24 11:44 ` [PATCH v1 3/3] bitmap: add trace outputs during open "bitmap" file Teng Long
2022-03-24 18:42   ` Junio C Hamano
2022-03-24 13:22 ` [PATCH v1 0/3] trace2 output for bitmap decision path Ævar Arnfjörð Bjarmason
2022-03-29  7:38   ` Teng Long Teng Long
2022-03-29  8:54     ` Ævar Arnfjörð Bjarmason
2022-04-21 13:26 ` [PATCH v2 0/5] trace2 output for bitmap decision path Teng Long
2022-04-21 13:26   ` [PATCH v2 1/5] pack-bitmap.c: continue looping when first MIDX bitmap is found Teng Long
2022-05-11 21:31     ` Taylor Blau
2022-04-21 13:26   ` [PATCH v2 2/5] pack-bitmap.c: rename "idx_name" to "bitmap_name" Teng Long
2022-05-11 21:31     ` Taylor Blau
2022-04-21 13:26   ` [PATCH v2 3/5] pack-bitmap.c: make warnings more detailed when opening bitmap Teng Long
2022-04-21 17:25     ` Taylor Blau
2022-05-06  9:08       ` Teng Long
2022-04-21 13:26   ` [PATCH v2 4/5] bitmap: add trace2 outputs during open "bitmap" file Teng Long
2022-04-21 15:51     ` Ævar Arnfjörð Bjarmason
2022-05-06 11:27       ` Teng Long
2022-05-06 11:53       ` Teng Long
2022-04-21 16:32     ` Jeff Hostetler
2022-05-06 12:43       ` Teng Long
2022-05-10 20:47         ` Jeff Hostetler
2022-04-21 13:26   ` [PATCH v2 5/5] pack-bitmap.c: using error() instead of silently returning -1 Teng Long
2022-04-21 15:41     ` Ævar Arnfjörð Bjarmason
2022-05-06 12:55       ` Teng Long
2022-06-12  7:44   ` [PATCH v3 0/5] Teng Long
2022-06-12  7:44     ` [PATCH v3 1/5] pack-bitmap.c: continue looping when first MIDX bitmap is found Teng Long
2022-06-12  7:44     ` [PATCH v3 2/5] pack-bitmap.c: rename "idx_name" to "bitmap_name" Teng Long
2022-06-12  7:44     ` [PATCH v3 3/5] pack-bitmap.c: make warnings support i18N when opening bitmap Teng Long
2022-06-12  7:44     ` [PATCH v3 4/5] pack-bitmap.c: using error() instead of silently returning -1 Teng Long
2022-06-14  1:15       ` Taylor Blau
2022-06-20 13:17         ` Teng Long
2022-06-12  7:44     ` [PATCH v3 5/5] bitmap: add trace2 outputs during open "bitmap" file Teng Long
2022-06-13 20:59       ` Junio C Hamano
2022-06-20 13:32         ` Teng Long
2022-06-14  1:40       ` Taylor Blau
2022-06-21  6:58         ` Teng Long
2022-06-22 12:51       ` Jeff Hostetler
2022-06-23  9:38         ` Teng Long
2022-06-23 15:14           ` Jeff Hostetler
2022-06-24  8:27             ` [PATCH v3 5/5] bitmap: add trace2 outputs during open "bitmap" Teng Long
2022-06-21 13:25     ` [PATCH v3 0/5] trace2 output for bitmap decision path Teng Long
2022-06-21 13:25       ` [PATCH v3 1/5] pack-bitmap.c: continue looping when first MIDX bitmap is found Teng Long
2022-06-21 13:25       ` [PATCH v3 2/5] pack-bitmap.c: rename "idx_name" to "bitmap_name" Teng Long
2022-06-21 13:25       ` [PATCH v3 3/5] pack-bitmap.c: make warnings support i18N when opening bitmap Teng Long
2022-06-21 13:25       ` [PATCH v3 4/5] pack-bitmap.c: using error() instead of silently returning -1 Teng Long
2022-06-21 13:25       ` [PATCH v3 5/5] bitmap: add trace2 outputs during open "bitmap" file Teng Long
2022-06-22 13:04         ` Jeff Hostetler
2022-06-22 15:12           ` Junio C Hamano
2022-06-28  8:17       ` [PATCH v5 0/5] tr2: avoid to print "interesting" config repeatedly Teng Long
2022-06-28  8:17         ` [PATCH v5 1/5] pack-bitmap.c: continue looping when first MIDX bitmap is found Teng Long
2022-06-28  8:17         ` [PATCH v5 2/5] pack-bitmap.c: rename "idx_name" to "bitmap_name" Teng Long
2022-06-28  8:17         ` [PATCH v5 3/5] pack-bitmap.c: using error() instead of silently returning -1 Teng Long
2022-06-28  8:17         ` [PATCH v5 4/5] pack-bitmap.c: retrieve missing i18n translations Teng Long
2022-06-28  8:58           ` Ævar Arnfjörð Bjarmason
2022-06-28  8:17         ` [PATCH v5 5/5] tr2: avoid to print "interesting" config repeatedly Teng Long
2022-06-28  9:13           ` Ævar Arnfjörð Bjarmason

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