Function checkBackupReadTsAdvanced

worker/backup.go:100–111

checkBackupReadTsAdvanced returns an error if readTs does not advance the backup chain past latestManifest. A regressed ReadTs means the cluster's timestamp counter went backwards (typically because Zero state was wiped or rebuilt while this backup chain was still active). The new posting list KVs w

(latestManifest *Manifest, readTs uint64)

// are silently dropped at restore, corrupting indexes. Callers should require
// forceFull to start a new chain when this triggers.
func checkBackupReadTsAdvanced(latestManifest *Manifest, readTs uint64) error {
	if latestManifest.Type == "" {
		return nil
	}
	if readTs > latestManifest.ValidReadTs() {
		return nil
	}
	return errors.Errorf("backup read_ts (%d) is not greater than the latest "+
		"manifest's read_ts (%d); this usually means Zero state was reset or "+
		"rebuilt while this backup chain was active. Use \"forceFull\" to "+
		"start a new chain.", readTs, latestManifest.ValidReadTs())
}

type MasterManifest struct {
	Manifests []*Manifest