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restorer: Allow writing target file blobs out of order

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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>
This commit is contained in:
Igor Fedorenko
2019-11-27 07:22:38 -05:00
committed by Leo R. Lundgren
parent f2bf06a419
commit f17ffa0283
13 changed files with 321 additions and 1448 deletions
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Enhancement: Simplify and improve restore performance
Significantly improves restore performance of large files (i.e. 50M+):
https://github.com/restic/restic/issues/2074
https://forum.restic.net/t/restore-using-rclone-gdrive-backend-is-slow/1112/8
https://forum.restic.net/t/degraded-restore-performance-s3-backend/1400
Fixes "not enough cache capacity" error during restore:
https://github.com/restic/restic/issues/2244
NOTE: This new implementation does not guarantee order in which blobs
are written to the target files and, for example, the last blob of a
file can be written to the file before any of the preceeding file blobs.
It is therefore possible to have gaps in the data written to the target
files if restore fails or interrupted by the user.
https://github.com/restic/restic/pull/2195