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bloom: ignore renames when computing changed paths 

The changed-path Bloom filters record an entry in the filter for
every path that was changed. This includes every add and delete,
regardless of whether a rename was detected. Detecting renames
causes significant performance issues, but also will trigger
downloading missing blobs in partial clone.

The simple fix is to disable rename detection when computing a
changed-path Bloom filter. This should already be disabled by
default, but it is good to explicitly enforce the intended
behavior.

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Derrick Stolee 2020-04-09 13:00:11 +00:00 committed by Junio C Hamano
parent d5b873c832
commit caf388caa1
1 changed files with 1 additions and 0 deletions
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bloom.c
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@ -189,6 +189,7 @@ struct bloom_filter *get_bloom_filter(struct repository *r,
repo_diff_setup(r, &diffopt);
diffopt.flags.recursive = 1;
diffopt.detect_rename = 0;
diffopt.max_changes = max_changes;
diff_setup_done(&diffopt);