fix: modify the way port number passing (#210)

* refactor naming of some variables

* fix sanity test failure

* modify to pick ports in linear fashion

* modify the way port number passing

* using plural ports instead of switching to singular

* trigger rebuild test

* fix KeyError

* retrigger rebuild test

Co-authored-by: Jinpeng Qi <qijinpen@amazon.com>

docker/build_artifacts/sagemaker/python_service.py

@@ -31,8 +31,8 @@
 
 SAGEMAKER_BATCHING_ENABLED = os.environ.get("SAGEMAKER_TFS_ENABLE_BATCHING", "false").lower()
 MODEL_CONFIG_FILE_PATH = "/sagemaker/model-config.cfg"
-TFS_GRPC_PORT_RANGE = os.environ.get("TFS_GRPC_PORT_RANGE")
-TFS_REST_PORT_RANGE = os.environ.get("TFS_REST_PORT_RANGE")
+TFS_GRPC_PORTS = os.environ.get("TFS_GRPC_PORTS")
+TFS_REST_PORTS = os.environ.get("TFS_REST_PORTS")
 SAGEMAKER_TFS_PORT_RANGE = os.environ.get("SAGEMAKER_SAFE_PORT_RANGE")
 TFS_INSTANCE_COUNT = int(os.environ.get("SAGEMAKER_TFS_INSTANCE_COUNT", "1"))
 
@@ -69,8 +69,8 @@ def __init__(self):
             # during the _handle_load_model_post()
             self.model_handlers = {}
         else:
-            self._tfs_grpc_ports = self._parse_sagemaker_port_range(TFS_GRPC_PORT_RANGE)
-            self._tfs_rest_ports = self._parse_sagemaker_port_range(TFS_REST_PORT_RANGE)
+            self._tfs_grpc_ports = self._parse_concat_ports(TFS_GRPC_PORTS)
+            self._tfs_rest_ports = self._parse_concat_ports(TFS_REST_PORTS)
 
             self._channels = {}
             for grpc_port in self._tfs_grpc_ports:
@@ -98,16 +98,11 @@ def on_post(self, req, res, model_name=None):
             data = json.loads(req.stream.read().decode("utf-8"))
             self._handle_load_model_post(res, data)
 
-    def _parse_sagemaker_port_range(self, port_range):
-        lower, upper = port_range.split('-')
-        lower = int(lower)
-        upper = int(upper)
-        if lower == upper:
-            return [lower]
-        return [lower + 2 * i for i in range(TFS_INSTANCE_COUNT)]
+    def _parse_concat_ports(self, concat_ports):
+        return concat_ports.split(",")
 
     def _pick_port(self, ports):
-        return str(random.choice(ports))
+        return random.choice(ports)
 
     def _parse_sagemaker_port_range_mme(self, port_range):
         lower, upper = port_range.split('-')
@@ -254,7 +249,7 @@ def _handle_invocation_post(self, req, res, model_name=None):
             rest_port = self._pick_port(self._tfs_rest_ports)
             data, context = tfs_utils.parse_request(req, rest_port, grpc_port,
                                                     self._tfs_default_model_name,
-                                                    channel=self._channels[int(grpc_port)])
+                                                    channel=self._channels[grpc_port])
 
         try:
             res.status = falcon.HTTP_200

docker/build_artifacts/sagemaker/serve.py

@@ -89,30 +89,29 @@ def __init__(self):
             parts = self._sagemaker_port_range.split("-")
             low = int(parts[0])
             hi = int(parts[1])
-            self._tfs_grpc_port = []
-            self._tfs_rest_port = []
+            self._tfs_grpc_ports = []
+            self._tfs_rest_ports = []
             if low + 2 * self._tfs_instance_count > hi:
                 raise ValueError("not enough ports available in SAGEMAKER_SAFE_PORT_RANGE ({})"
                                  .format(self._sagemaker_port_range))
-            self._tfs_grpc_port_range = "{}-{}".format(low,
-                                                       low + 2 * self._tfs_instance_count)
-            self._tfs_rest_port_range = "{}-{}".format(low + 1,
-                                                       low + 2 * self._tfs_instance_count + 1)
+            # select non-overlapping grpc and rest ports based on tfs instance count
             for i in range(self._tfs_instance_count):
-                self._tfs_grpc_port.append(str(low + 2 * i))
-                self._tfs_rest_port.append(str(low + 2 * i + 1))
-            # set environment variable for python service
-            os.environ["TFS_GRPC_PORT_RANGE"] = self._tfs_grpc_port_range
-            os.environ["TFS_REST_PORT_RANGE"] = self._tfs_rest_port_range
+                self._tfs_grpc_ports.append(str(low + 2 * i))
+                self._tfs_rest_ports.append(str(low + 2 * i + 1))
+            # concat selected ports respectively in order to pass them to python service
+            self._tfs_grpc_concat_ports = self._concat_ports(self._tfs_grpc_ports)
+            self._tfs_rest_concat_ports = self._concat_ports(self._tfs_rest_ports)
         else:
             # just use the standard default ports
-            self._tfs_grpc_port = ["9000"]
-            self._tfs_rest_port = ["8501"]
-            self._tfs_grpc_port_range = "9000-9000"
-            self._tfs_rest_port_range = "8501-8501"
-            # set environment variable for python service
-            os.environ["TFS_GRPC_PORT_RANGE"] = self._tfs_grpc_port_range
-            os.environ["TFS_REST_PORT_RANGE"] = self._tfs_rest_port_range
+            self._tfs_grpc_ports = ["9000"]
+            self._tfs_rest_ports = ["8501"]
+            # provide single concat port here for default case
+            self._tfs_grpc_concat_ports = "9000"
+            self._tfs_rest_concat_ports = "8501"
+
+        # set environment variable for python service
+        os.environ["TFS_GRPC_PORTS"] = self._tfs_grpc_concat_ports
+        os.environ["TFS_REST_PORTS"] = self._tfs_rest_concat_ports
 
     def _need_python_service(self):
         if os.path.exists(INFERENCE_PATH):
@@ -121,6 +120,11 @@ def _need_python_service(self):
                 and os.environ.get("SAGEMAKER_MULTI_MODEL_UNIVERSAL_PREFIX"):
             self._enable_python_service = True
 
+    def _concat_ports(self, ports):
+        str_ports = [str(port) for port in ports]
+        concat_str_ports = ",".join(str_ports)
+        return concat_str_ports
+
     def _create_tfs_config(self):
         models = tfs_utils.find_models()
 
@@ -194,13 +198,13 @@ def _setup_gunicorn(self):
         gunicorn_command = (
             "gunicorn -b unix:/tmp/gunicorn.sock -k {} --chdir /sagemaker "
             "--workers {} --threads {} "
-            "{}{} -e TFS_GRPC_PORT_RANGE={} -e TFS_REST_PORT_RANGE={} "
+            "{}{} -e TFS_GRPC_PORTS={} -e TFS_REST_PORTS={} "
             "-e SAGEMAKER_MULTI_MODEL={} -e SAGEMAKER_SAFE_PORT_RANGE={} "
             "-e SAGEMAKER_TFS_WAIT_TIME_SECONDS={} "
             "python_service:app").format(self._gunicorn_worker_class,
                                          self._gunicorn_workers, self._gunicorn_threads,
                                          python_path_option, ",".join(python_path_content),
-                                         self._tfs_grpc_port_range, self._tfs_rest_port_range,
+                                         self._tfs_grpc_concat_ports, self._tfs_rest_concat_ports,
                                          self._tfs_enable_multi_model_endpoint,
                                          self._sagemaker_port_range,
                                          self._tfs_wait_time_seconds)
@@ -230,7 +234,7 @@ def _download_scripts(self, bucket, prefix):
     def _create_nginx_tfs_upstream(self):
         indentation = "    "
         tfs_upstream = ""
-        for port in self._tfs_rest_port:
+        for port in self._tfs_rest_ports:
             tfs_upstream += "{}server localhost:{};\n".format(indentation, port)
         tfs_upstream = tfs_upstream[len(indentation):-2]
 
@@ -334,7 +338,7 @@ def _wait_for_gunicorn(self):
 
     def _wait_for_tfs(self):
         for i in range(self._tfs_instance_count):
-            tfs_utils.wait_for_model(self._tfs_rest_port[i],
+            tfs_utils.wait_for_model(self._tfs_rest_ports[i],
                                      self._tfs_default_model_name, self._tfs_wait_time_seconds)
 
     @contextmanager
@@ -370,8 +374,8 @@ def _restart_single_tfs(self, pid):
 
     def _start_single_tfs(self, instance_id):
         cmd = tfs_utils.tfs_command(
-            self._tfs_grpc_port[instance_id],
-            self._tfs_rest_port[instance_id],
+            self._tfs_grpc_ports[instance_id],
+            self._tfs_rest_ports[instance_id],
             self._tfs_config_path,
             self._tfs_enable_batching,
             self._tfs_batching_config_path,