etcdserver: use request timeout defined by ServerConfig for v3 requests

etcdserver/v3_server.go

@@ -35,9 +35,6 @@ const (
 	// specify a large value might end up with shooting in the foot.
 	maxRequestBytes = 1.5 * 1024 * 1024
 
-	// max timeout for waiting a v3 request to go through raft.
-	maxV3RequestTimeout = 5 * time.Second
-
 	// In the health case, there might be a small gap (10s of entries) between
 	// the applied index and committed index.
 	// However, if the committed entries are very heavy to apply, the gap might grow.
@@ -557,7 +554,7 @@ func (s *EtcdServer) processInternalRaftRequestOnce(ctx context.Context, r pb.In
 	}
 	ch := s.w.Register(id)
 
-	cctx, cancel := context.WithTimeout(ctx, maxV3RequestTimeout)
+	cctx, cancel := context.WithTimeout(ctx, s.Cfg.ReqTimeout())
 	defer cancel()
 
 	start := time.Now()