server: only owner do bootstrap

session/bootstrap.go

@@ -31,6 +31,7 @@ import (
  "github.com/pingcap/parser/mysql"
  "github.com/pingcap/parser/terror"
  "github.com/pingcap/tidb/ddl"
+ "github.com/pingcap/tidb/domain"
  "github.com/pingcap/tidb/infoschema"
  "github.com/pingcap/tidb/sessionctx/variable"
  "github.com/pingcap/tidb/util/chunk"
@@ -250,17 +251,27 @@ const (
 
 // bootstrap initiates system DB for a store.
 func bootstrap(s Session) {
- b, err := checkBootstrapped(s)
- if err != nil {
- logutil.Logger(context.Background()).Fatal("check bootstrap error",
- zap.Error(err))
- }
- if b {
- upgrade(s)
- return
+ dom := domain.GetDomain(s)
+ for {
+ b, err := checkBootstrapped(s)
+ if err != nil {
+ logutil.Logger(context.Background()).Fatal("check bootstrap error",
+ zap.Error(err))
+ }
+ // For rolling upgrade, we can't do upgrade only in the owner.
+ if b {
+ upgrade(s)
+ return
+ }
+ // To reduce conflict when multiple TiDB-server start at the same time.
+ // Actually only one server need to do the bootstrap. So we chose DDL owner to do this.
+ if dom.DDL().OwnerManager().IsOwner() {
+ doDDLWorks(s)
+ doDMLWorks(s)
+ return
+ }
+ time.Sleep(200 * time.Millisecond)
  }
- doDDLWorks(s)
- doDMLWorks(s)
 }
 
 const (