fix: Revert "enhance: avoid the coexistence of the old coordinator an…

…d the new node/proxy (#35720)" (#36113)

issue: #36100
This reverts commit 73be0ba.

Signed-off-by: Wei Liu <wei.liu@zilliz.com>

cmd/roles/roles.go

@@ -445,35 +445,6 @@ func (mr *MilvusRoles) Run() {
 		componentMap[typeutil.QueryCoordRole] = queryCoord
 	}
 
-	waitCoordBecomeHealthy := func() {
-		for {
-			select {
-			case <-ctx.Done():
-				log.Info("wait all coord become healthy loop quit")
-				return
-			default:
-				rcState := rootCoord.Health(ctx)
-				dcState := dataCoord.Health(ctx)
-				icState := indexCoord.Health(ctx)
-				qcState := queryCoord.Health(ctx)
-
-				if rcState == commonpb.StateCode_Healthy && dcState == commonpb.StateCode_Healthy && icState == commonpb.StateCode_Healthy && qcState == commonpb.StateCode_Healthy {
-					log.Info("all coord become healthy")
-					return
-				}
-				log.Info("wait all coord become healthy", zap.String("rootCoord", rcState.String()), zap.String("dataCoord", dcState.String()), zap.String("indexCoord", icState.String()), zap.String("queryCoord", qcState.String()))
-				time.Sleep(time.Second)
-			}
-		}
-	}
-
-	// In standalone mode, block the start process until the new coordinator is active to avoid the coexistence of the old coordinator and the new node/proxy
-	// 1. In the start/restart process, the new coordinator will become active immediately and will not be blocked
-	// 2. In the rolling upgrade process, the new coordinator will not be active until the old coordinator is down, and it will be blocked
-	if mr.Local {
-		waitCoordBecomeHealthy()
-	}
-
 	if mr.EnableQueryNode {
 		queryNode = mr.runQueryNode(ctx, local, &wg)
 		componentMap[typeutil.QueryNodeRole] = queryNode