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multi-pack-index: repack batches below --batch-size

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The --batch-size=<size> option of 'git multi-pack-index repack' is
intended to limit the amount of work done by the repack. In the case of
a large repository, this command should repack a number of small
pack-files but leave the large pack-files alone. Most often, the
repository has one large pack-file from a 'git clone' operation and
number of smaller pack-files from incremental 'git fetch' operations.

The issue with '--batch-size' is that it also _prevents_ the repack from
happening if the expected size of the resulting pack-file is too small.
This was intended as a way to avoid frequent churn of small pack-files,
but it has mostly caused confusion when a repository is of "medium"
size. That is, not enormous like the Windows OS repository, but also not
so small that this incremental repack isn't valuable.

The solution presented here is to collect pack-files for repack if their
expected size is smaller than the batch-size parameter until either the
total expected size exceeds the batch-size or all pack-files are
considered. If there are at least two pack-files, then these are
combined to a new pack-file whose size should not be too much larger
than the batch-size.

This new strategy should succeed in keeping the number of pack-files
small in these "medium" size repositories. The concern about churn is
likely not interesting, as the real control over that is the frequency
in which the repack command is run.

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Reviewed-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Derrick Stolee 2020-08-11 15:30:18 +00:00 committed by Junio C Hamano
parent 4f0a8be784
commit 1eb22c7dd8
3 changed files with 25 additions and 6 deletions
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11
Documentation/git-multi-pack-index.txt
View File

@ -51,11 +51,12 @@ repack::
multi-pack-index, then divide by the total number of objects in
the pack and multiply by the pack size. We select packs with
expected size below the batch size until the set of packs have
total expected size at least the batch size. If the total size
does not reach the batch size, then do nothing. If a new pack-
file is created, rewrite the multi-pack-index to reference the
new pack-file. A later run of 'git multi-pack-index expire' will
delete the pack-files that were part of this batch.
total expected size at least the batch size, or all pack-files
are considered. If only one pack-file is selected, then do
nothing. If a new pack-file is created, rewrite the
multi-pack-index to reference the new pack-file. A later run of
'git multi-pack-index expire' will delete the pack-files that
were part of this batch.
+
If `repack.packKeptObjects` is `false`, then any pack-files with an
associated `.keep` file will not be selected for the batch to repack.

2
midx.c
View File

@ -1371,7 +1371,7 @@ static int fill_included_packs_batch(struct repository *r,
free(pack_info);
if (total_size < batch_size || packs_to_repack < 2)
if (packs_to_repack < 2)
return 1;
return 0;

18
t/t5319-multi-pack-index.sh
View File

@ -643,6 +643,7 @@ test_expect_success 'expire respects .keep files' '
'
test_expect_success 'repack --batch-size=0 repacks everything' '
cp -r dup dup2 &&
(
cd dup &&
rm .git/objects/pack/*.keep &&
@ -662,4 +663,21 @@ test_expect_success 'repack --batch-size=0 repacks everything' '
)
'
test_expect_success 'repack --batch-size=<large> repacks everything' '
(
cd dup2 &&
rm .git/objects/pack/*.keep &&
ls .git/objects/pack/*idx >idx-list &&
test_line_count = 2 idx-list &&
git multi-pack-index repack --batch-size=2000000 &&
ls .git/objects/pack/*idx >idx-list &&
test_line_count = 3 idx-list &&
test-tool read-midx .git/objects | grep idx >midx-list &&
test_line_count = 3 midx-list &&
git multi-pack-index expire &&
ls -al .git/objects/pack/*idx >idx-list &&
test_line_count = 1 idx-list
)
'
test_done