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Users may want to specify a minimum batch size for their needs. This is only a minimum: the path-walk API provides a list of OIDs that correspond to the same path, and thus it is optimal to allow delta compression across those objects in a single server request. We could consider limiting the request to have a maximum batch size in the future. Signed-off-by: Derrick Stolee <stolee@gmail.com>
56 lines
1.8 KiB
Plaintext
56 lines
1.8 KiB
Plaintext
git-backfill(1)
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===============
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NAME
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----
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git-backfill - Download missing objects in a partial clone
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SYNOPSIS
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--------
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[verse]
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'git backfill' [--batch-size=<n>]
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DESCRIPTION
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-----------
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Blobless partial clones are created using `git clone --filter=blob:none`
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and then configure the local repository such that the Git client avoids
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downloading blob objects unless they are required for a local operation.
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This initially means that the clone and later fetches download reachable
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commits and trees but no blobs. Later operations that change the `HEAD`
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pointer, such as `git checkout` or `git merge`, may need to download
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missing blobs in order to complete their operation.
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In the worst cases, commands that compute blob diffs, such as `git blame`,
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become very slow as they download the missing blobs in single-blob
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requests to satisfy the missing object as the Git command needs it. This
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leads to multiple download requests and no ability for the Git server to
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provide delta compression across those objects.
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The `git backfill` command provides a way for the user to request that
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Git downloads the missing blobs (with optional filters) such that the
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missing blobs representing historical versions of files can be downloaded
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in batches. The `backfill` command attempts to optimize the request by
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grouping blobs that appear at the same path, hopefully leading to good
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delta compression in the packfile sent by the server.
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By default, `git backfill` downloads all blobs reachable from the `HEAD`
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commit. This set can be restricted or expanded using various options.
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OPTIONS
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-------
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--batch-size=<n>::
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Specify a minimum size for a batch of missing objects to request
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from the server. This size may be exceeded by the last set of
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blobs seen at a given path. Default batch size is 16,000.
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SEE ALSO
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--------
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linkgit:git-clone[1].
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GIT
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---
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Part of the linkgit:git[1] suite
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