From 05007c86bb5c32a1bea6dde3f1f4fed5e8cdedd9 Mon Sep 17 00:00:00 2001
From: maizige <37949155+wsx864321@users.noreply.github.com>
Date: Sat, 27 Aug 2022 12:18:23 +0800
Subject: [PATCH] fix:duplicate copy MD (#2304)

---
 zrpc/internal/clientinterceptors/tracinginterceptor.go | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/zrpc/internal/clientinterceptors/tracinginterceptor.go b/zrpc/internal/clientinterceptors/tracinginterceptor.go
index 5d4b666e..e9cbc6ef 100644
--- a/zrpc/internal/clientinterceptors/tracinginterceptor.go
+++ b/zrpc/internal/clientinterceptors/tracinginterceptor.go
@@ -153,11 +153,8 @@ func (w *clientStream) sendStreamEvent(eventType streamEventType, err error) {
 }
 
 func startSpan(ctx context.Context, method, target string) (context.Context, trace.Span) {
-	var md metadata.MD
-	requestMetadata, ok := metadata.FromOutgoingContext(ctx)
-	if ok {
-		md = requestMetadata.Copy()
-	} else {
+	md, ok := metadata.FromOutgoingContext(ctx)
+	if !ok {
 		md = metadata.MD{}
 	}
 	tr := otel.Tracer(ztrace.TraceName)