br: change start mode in nextgen build (#64320)

close #64332

Author: 3pointer

br/pkg/gluetidb/glue.go

@@ -115,7 +115,7 @@ func (g Glue) startDomainAsNeeded(store kv.Storage) error {
 	if err != nil {
 		return err
 	}
-	return dom.Start(ddl.Normal)
+	return dom.Start(ddl.BR)
 }
 
 func (g Glue) createTypesSession(store kv.Storage) (sessionapi.Session, error) {

pkg/ddl/ddl.go

@@ -109,6 +109,8 @@ const (
 	// the DDL owner, to make sure all upgrade related DDLs are run on new version
 	// TiDB instance.
 	Upgrade StartMode = "upgrade"
+	// BR mode, Start DDL from br, with this mode can skip loadSystemStore in next-gen and initLogBackup.
+	BR StartMode = "br"
 )
 
 // OnExist specifies what to do when a new object has a name collision.

pkg/domain/domain.go

@@ -827,9 +827,11 @@ func (do *Domain) Start(startMode ddl.StartMode) error {
 		}, "closestReplicaReadCheckLoop")
 	}
 
-	err = do.initLogBackup(do.ctx, pdCli)
-	if err != nil {
-		return err
+	if startMode != ddl.BR {
+		err = do.initLogBackup(do.ctx, pdCli)
+		if err != nil {
+			return err
+		}
 	}
 
 	// right now we only allow access system keyspace info schema after fully bootstrap.