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backend/retry: Overwrite failed uploads instead of deleting them 

For backends which are able to atomically replace files, we just can
overwrite the old copy, if it is necessary to retry an upload. This has
the benefit of issuing one operation less and might be beneficial if a
backend storage, due to bugs or similar, could mix up the order of the
upload and delete calls.
This commit is contained in:
Michael Eischer 2022-08-21 11:14:53 +02:00
parent fc506f8538
commit de0162ea76
1 changed files with 10 additions and 4 deletions
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14
internal/backend/backend_retry.go
View File

@ -68,10 +68,16 @@ func (be *RetryBackend) Save(ctx context.Context, h restic.Handle, rd restic.Rew
return nil
}
debug.Log("Save(%v) failed with error, removing file: %v", h, err)
rerr := be.Backend.Remove(ctx, h)
if rerr != nil {
debug.Log("Remove(%v) returned error: %v", h, err)
if be.Backend.HasAtomicReplace() {
debug.Log("Save(%v) failed with error: %v", h, err)
// there is no need to remove files from backends which can atomically replace files
// in fact if something goes wrong at the backend side the delete operation might delete the wrong instance of the file
} else {
debug.Log("Save(%v) failed with error, removing file: %v", h, err)
rerr := be.Backend.Remove(ctx, h)
if rerr != nil {
debug.Log("Remove(%v) returned error: %v", h, err)
}
}
// return original error