This is an automated cherry-pick of tikv#8824

close tikv#8823

Signed-off-by: ti-chi-bot <ti-community-prow-bot@tidb.io>

server/region_syncer/client.go

@@ -36,6 +36,11 @@ import (
 const (
 	keepaliveTime    = 10 * time.Second
 	keepaliveTimeout = 3 * time.Second
+<<<<<<< HEAD:server/region_syncer/client.go
+=======
+	msgSize          = 8 * units.MiB
+	retryInterval    = time.Second
+>>>>>>> 41ec8dced (syncer: exit watch leader immediately (#8824)):pkg/syncer/client.go
 )
 
 // StopSyncWithLeader stop to sync the region with leader.
@@ -160,7 +165,12 @@ func (s *RegionSyncer) StartSyncWithLeader(addr string) {
 					}
 				}
 				log.Error("server failed to establish sync stream with leader", zap.String("server", s.server.Name()), zap.String("leader", s.server.GetLeader().GetName()), errs.ZapError(err))
-				time.Sleep(time.Second)
+				select {
+				case <-ctx.Done():
+					log.Info("stop synchronizing with leader due to context canceled")
+					return
+				case <-time.After(retryInterval):
+				}
 				continue
 			}
 
@@ -172,7 +182,12 @@ func (s *RegionSyncer) StartSyncWithLeader(addr string) {
 					if err = stream.CloseSend(); err != nil {
 						log.Error("failed to terminate client stream", errs.ZapError(errs.ErrGRPCCloseSend, err))
 					}
-					time.Sleep(time.Second)
+					select {
+					case <-ctx.Done():
+						log.Info("stop synchronizing with leader due to context canceled")
+						return
+					case <-time.After(retryInterval):
+					}
 					break
 				}
 				if s.history.GetNextIndex() != resp.GetStartIndex() {
@@ -213,7 +228,17 @@ func (s *RegionSyncer) StartSyncWithLeader(addr string) {
 						log.Debug("region is stale", zap.Stringer("origin", origin.GetMeta()), errs.ZapError(err))
 						continue
 					}
+<<<<<<< HEAD:server/region_syncer/client.go
 					_, saveKV, _, _ := regionGuide(region, origin)
+=======
+					cctx := &core.MetaProcessContext{
+						Context:    ctx,
+						TaskRunner: ratelimit.NewSyncRunner(),
+						Tracer:     core.NewNoopHeartbeatProcessTracer(),
+						// no limit for followers.
+					}
+					saveKV, _, _, _ := regionGuide(cctx, region, origin)
+>>>>>>> 41ec8dced (syncer: exit watch leader immediately (#8824)):pkg/syncer/client.go
 					overlaps := bc.PutRegion(region)
 
 					if saveKV {