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f17ffa0283
Much simpler implementation that guarantees each required pack is downloaded only once (and hence does not need to manage pack cache). Also improves large file restore performance. Signed-off-by: Igor Fedorenko <igor@ifedorenko.com>
25 lines
1.1 KiB
Go
25 lines
1.1 KiB
Go
// Package restorer contains code to restore data from a repository.
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//
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// The Restorer tries to keep the number of backend requests minimal. It does
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// this by downloading all required blobs of a pack file with a single backend
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// request and avoiding repeated downloads of the same pack. In addition,
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// several pack files are fetched concurrently.
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//
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// Here is high-level pseudo-code of how the Restorer attempts to achieve
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// these goals:
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//
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// while there are packs to process
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// choose a pack to process [1]
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// retrieve the pack from the backend [2]
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// write pack blobs to the files that need them [3]
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//
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// Retrieval of repository packs (step [2]) and writing target files (step [3])
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// are performed concurrently on multiple goroutines.
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//
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// Implementation does not guarantee order in which blobs are written to the
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// target files and, for example, the last blob of a file can be written to the
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// file before any of the preceeding file blobs. It is therefore possible to
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// have gaps in the data written to the target files if restore fails or
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// interrupted by the user.
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package restorer
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