From c7b8505956106b3bc507a461ea5796838d6bfa2b Mon Sep 17 00:00:00 2001
From: dentinyhao <dentinyhao@gmail.com>
Date: Tue, 31 Mar 2026 04:40:37 -0700
Subject: [PATCH] fix(lb): Use the first address for pick-first policy

---
 grpc/src/client/load_balancing/pick_first.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/grpc/src/client/load_balancing/pick_first.rs b/grpc/src/client/load_balancing/pick_first.rs
index 0c10807a5..21e5817bb 100644
--- a/grpc/src/client/load_balancing/pick_first.rs
+++ b/grpc/src/client/load_balancing/pick_first.rs
@@ -91,7 +91,10 @@ impl LbPolicy for PickFirstPolicy {
             .ok_or("no endpoints")?
             .addresses;
 
-        let address = addresses.pop().ok_or("no addresses")?;
+        if addresses.is_empty() {
+            return Err("no addresses".to_string());
+        }
+        let address = addresses.remove(0);
 
         let sc = channel_controller.new_subchannel(&address);
         sc.connect();