diff --git a/apisix/upstream.lua b/apisix/upstream.lua
index 681ce682..7cef761d 100644
--- a/apisix/upstream.lua
+++ b/apisix/upstream.lua
@@ -144,7 +144,7 @@ do
         grpcs = 443,
     }
 
-    function fill_node_info(up_conf, scheme)
+    function fill_node_info(up_conf, scheme, is_stream)
         local nodes = up_conf.nodes
         if up_conf.nodes_ref == nodes then
             -- filled
@@ -153,7 +153,7 @@ do
 
         local need_filled = false
         for _, n in ipairs(nodes) do
-            if not n.port then
+            if not is_stream and not n.port then
                 if up_conf.scheme ~= scheme then
                     return nil, "Can't detect upstream's scheme. " ..
                                 "You should either specify a port in the node " ..
@@ -180,7 +180,7 @@ do
             if not n.port or not n.priority then
                 filled_nodes[i] = core.table.clone(n)
 
-                if not n.port then
+                if not is_stream and not n.port then
                     filled_nodes[i].port = scheme_to_port[scheme]
                 end
 
@@ -259,12 +259,17 @@ function _M.set_by_route(route, api_ctx)
     end
 
     if not is_http then
+        local ok, err = fill_node_info(up_conf, nil, true)
+        if not ok then
+            return 503, err
+        end
+
         return
     end
 
     set_upstream_scheme(api_ctx, up_conf)
 
-    local ok, err = fill_node_info(up_conf, api_ctx.upstream_scheme)
+    local ok, err = fill_node_info(up_conf, api_ctx.upstream_scheme, false)
     if not ok then
         return 503, err
     end
diff --git a/t/stream-node/priority-balancer.t b/t/stream-node/priority-balancer.t
new file mode 100644
index 00000000..e25bdc3f
--- /dev/null
+++ b/t/stream-node/priority-balancer.t
@@ -0,0 +1,158 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+use t::APISIX 'no_plan';
+
+repeat_each(2); # repeat each test to ensure after_balance is called correctly
+log_level('info');
+no_root_location();
+worker_connections(1024);
+no_shuffle();
+
+add_block_preprocessor(sub {
+    my ($block) = @_;
+
+    if ($block->apisix_yaml) {
+        if (!$block->yaml_config) {
+            my $yaml_config = <<_EOC_;
+apisix:
+    node_listen: 1984
+    config_center: yaml
+    enable_admin: false
+_EOC_
+
+            $block->set_value("yaml_config", $yaml_config);
+        }
+    }
+
+    $block->set_value("stream_enable", 1);
+
+    if (!$block->stream_request) {
+        $block->set_value("stream_request", "mmm");
+    }
+
+    if ((!defined $block->error_log) && (!defined $block->no_error_log)) {
+        $block->set_value("no_error_log", "[error]");
+    }
+});
+
+run_tests();
+
+__DATA__
+
+=== TEST 1: sanity
+--- apisix_yaml
+stream_routes:
+    -
+    id: 1
+    upstream:
+        type: least_conn
+        nodes:
+        - host: 127.0.0.1
+          port: 1979
+          weight: 2
+          priority: 1
+        - host: 127.0.0.2
+          port: 1979
+          weight: 1
+          priority: 1
+        - host: 127.0.0.3
+          port: 1979
+          weight: 2
+          priority: 0
+        - host: 127.0.0.4
+          port: 1979
+          weight: 1
+          priority: 0
+        - host: 127.0.0.1
+          port: 1995
+          weight: 2
+          priority: -1
+#END
+--- stream_response
+hello world
+--- error_log
+connect() failed
+failed to get server from current priority 1, try next one
+failed to get server from current priority 0, try next one
+--- grep_error_log eval
+qr/proxy request to \S+/
+--- grep_error_log_out
+proxy request to 127.0.0.1:1979
+proxy request to 127.0.0.2:1979
+proxy request to 127.0.0.3:1979
+proxy request to 127.0.0.4:1979
+proxy request to 127.0.0.1:1995
+
+
+
+=== TEST 2: default priority is 0
+--- apisix_yaml
+stream_routes:
+    -
+    id: 1
+    upstream:
+        type: least_conn
+        nodes:
+        - host: 127.0.0.1
+          port: 1979
+          weight: 2
+          priority: 1
+        - host: 127.0.0.2
+          port: 1979
+          weight: 1
+          priority: 1
+        - host: 127.0.0.3
+          port: 1979
+          weight: 2
+        - host: 127.0.0.4
+          port: 1979
+          weight: 1
+        - host: 127.0.0.1
+          port: 1995
+          weight: 2
+          priority: -1
+#END
+--- stream_response
+hello world
+--- error_log
+connect() failed
+failed to get server from current priority 1, try next one
+failed to get server from current priority 0, try next one
+--- grep_error_log eval
+qr/proxy request to \S+/
+--- grep_error_log_out
+proxy request to 127.0.0.1:1979
+proxy request to 127.0.0.2:1979
+proxy request to 127.0.0.3:1979
+proxy request to 127.0.0.4:1979
+proxy request to 127.0.0.1:1995
+
+
+
+=== TEST 3: fix priority for nonarray nodes
+--- apisix_yaml
+stream_routes:
+    -
+    id: 1
+    upstream:
+        type: roundrobin
+        nodes:
+            "127.0.0.1:1995": 1
+            "127.0.0.2:1995": 1
+#END
+--- stream_response
+hello world