WeichenXu123 commented on code in PR #40297:
URL: https://github.com/apache/spark/pull/40297#discussion_r1135600960


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connector/connect/common/src/main/protobuf/spark/connect/ml.proto:
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@@ -0,0 +1,176 @@
+/*
+ * 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.
+ */
+
+syntax = 'proto3';
+
+package spark.connect;
+
+import "spark/connect/expressions.proto";
+import "spark/connect/relations.proto";
+import "spark/connect/ml_common.proto";
+
+option java_multiple_files = true;
+option java_package = "org.apache.spark.connect.proto";
+
+
+message MlEvaluator {
+  string name = 1;
+  MlParams params = 2;
+  string uid = 3;
+}
+
+
+message MlCommand {
+  oneof ml_command_type {
+    Fit fit = 1;
+    FetchModelAttr fetch_model_attr = 2;
+    FetchModelSummaryAttr fetch_model_summary_attr = 3;
+    LoadModel load_model = 4;
+    SaveModel save_model = 5;
+    Evaluate evaluate = 6;
+    SaveStage save_stage = 7;
+    LoadStage load_stage = 8;
+    SaveEvaluator save_evaluator = 9;
+    LoadEvaluator load_evaluator = 10;
+    CopyModel copy_model = 11;
+    DeleteModel delete_model = 12;
+  }
+
+  message Fit {
+    MlStage estimator = 1;
+    Relation dataset = 2;
+  }
+
+  message Evaluate {
+    MlEvaluator evaluator = 1;
+  }
+
+  message LoadModel {

Review Comment:
   Btw, supporting 3rd-party estimators is risky, because in shared cluster we 
will [binpack the spark workers across different 
customers](https://docs.google.com/document/d/1sJVjan44XagM48PEqdkg6KWctpPcz54Urf0i_-dGesA/edit?disco=AAAArl9hpF8)
   But 3rd-party estimators implementation might invoke RDD transformation 
(e.g. RDD.map) that we cannot isolate them by container. So it is risky if we 
allow user uses 3rd-party estimators on shared cluster.



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