add back remove old conns

Author: cinquemb

ngx_http_upstream_serverlist.c

@@ -1209,7 +1209,7 @@ refresh_upstream(serverlist *sl, ngx_str_t *body, ngx_log_t *log) {
     dump_serverlist(new_sl);
 
     serverlist *old_sls = mcf->serverlists.elts;
-    //service_conn *old_scs = mcf->service_conns.elts;
+    service_conn *old_scs = mcf->service_conns.elts;
     ngx_uint_t i;
 
     for (i = 0; i < mcf->serverlists.nelts; i++) {
@@ -1223,10 +1223,10 @@ refresh_upstream(serverlist *sl, ngx_str_t *body, ngx_log_t *log) {
             old_sls[i].new_pool = NULL;
         }
 
-        /*if (old_scs[i].peer_conn.connection) {
+        if (old_scs[i].peer_conn.connection) {
             ngx_close_connection(old_scs[i].peer_conn.connection);
             old_scs[i].peer_conn.connection = NULL;
-        }*/
+        }
     }
 
     if (old_servers != NULL) {