mcs: fix ticker stop in register

pkg/mcs/discovery/register.go

@@ -82,11 +82,11 @@
 					log.Error("keep alive failed", zap.String("key", sr.key))
 					// retry
 					t := time.NewTicker(time.Duration(sr.ttl) * time.Second / 2)
+					defer t.Stop()
 					for {
 						select {
 						case <-sr.ctx.Done():
 							log.Info("exit register process", zap.String("key", sr.key))
-							t.Stop()
 							return
 						default:
 						}
@@ -95,13 +95,11 @@
 						resp, err := sr.cli.Grant(sr.ctx, sr.ttl)
 						if err != nil {
 							log.Error("grant lease failed", zap.String("key", sr.key), zap.Error(err))
-							t.Stop()
 							continue
 						}
 
 						if _, err := sr.cli.Put(sr.ctx, sr.key, sr.value, clientv3.WithLease(resp.ID)); err != nil {
 							log.Error("put the key failed", zap.String("key", sr.key), zap.Error(err))
-							t.Stop()
 							continue
 						}
 					}

server/server.go

@@ -1861,6 +1861,12 @@ func (s *Server) initTSOPrimaryWatcher() {
 		return nil
 	}
 	deleteFn := func(kv *mvccpb.KeyValue) error {
+		var oldPrimary string
+		v, ok := s.servicePrimaryMap.Load(serviceName)
+		if ok {
+			oldPrimary = v.(string)
+		}
+		log.Info("delete tso primary", zap.String("old-primary", oldPrimary))
 		s.servicePrimaryMap.Delete(serviceName)
 		return nil
 	}