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glossary: add reachability bitmap description 

Describe the purpose of the reachability bitmap.

Signed-off-by: Philip Oakley <philipoakley@iee.email>
Signed-off-by: Taylor Blau <me@ttaylorr.com>
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Philip Oakley 2022-10-29 17:41:11 +01:00 committed by Taylor Blau
parent 4973726c5d
commit 8fea12ab40
1 changed files with 8 additions and 0 deletions
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Documentation/glossary-content.txt
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@ -508,6 +508,14 @@ exclude;;
<<def_tree_object,trees>> to the trees or <<def_blob_object,blobs>>
that they contain.
[[def_reachability_bitmap]]reachability bitmaps::
Reachability bitmaps store information about the
<<def_reachable,reachability>> of a selected set of commits in
a packfile, or a multi-pack index (MIDX), to speed up object search.
The bitmaps are stored in a ".bitmap" file. A repository may have at
most one bitmap file in use. The bitmap file may belong to either one
pack, or the repository's multi-pack index (if it exists).
[[def_rebase]]rebase::
To reapply a series of changes from a <<def_branch,branch>> to a
different base, and reset the <<def_head,head>> of that branch