[GitHub] [kafka] dengziming commented on a change in pull request #9641: MINOR: Convert connect assignment schemas to use generated protocol

[GitBox <gi...@apache.org>]

dengziming commented on a change in pull request #9641:
URL: https://github.com/apache/kafka/pull/9641#discussion_r548488090



##########
File path: connect/runtime/src/main/resources/common/message/ConnectAssignment.json
##########
@@ -0,0 +1,35 @@
+// 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.
+
+{
+  // Assignments for each worker are a set of connectors and tasks. These are categorized by
+  // connector ID. A sentinel task ID (CONNECTOR_TASK) is used to indicate the connector itself
+  // (i.e. that the assignment includes responsibility for running the Connector instance in
+  // addition to any tasks it generates).
+  "type": "data",
+  "name": "ConnectAssignment",
+  "validVersions": "0",
+  "fields": [
+    { "name": "error", "type": "int16", "versions": "0" },

Review comment:
       We can add some annotations here.

##########
File path: connect/runtime/src/main/java/org/apache/kafka/connect/runtime/distributed/ConnectProtocol.java
##########
@@ -43,96 +27,9 @@
  * joining the group and distributing assignments, and the format of assignments of connectors and tasks to workers.
  */
 public class ConnectProtocol {
-    public static final String VERSION_KEY_NAME = "version";
-    public static final String URL_KEY_NAME = "url";
-    public static final String CONFIG_OFFSET_KEY_NAME = "config-offset";
-    public static final String CONNECTOR_KEY_NAME = "connector";
-    public static final String LEADER_KEY_NAME = "leader";
-    public static final String LEADER_URL_KEY_NAME = "leader-url";
-    public static final String ERROR_KEY_NAME = "error";
-    public static final String TASKS_KEY_NAME = "tasks";
-    public static final String ASSIGNMENT_KEY_NAME = "assignment";
     public static final int CONNECTOR_TASK = -1;
-
     public static final short CONNECT_PROTOCOL_V0 = 0;

Review comment:
       The `CONNECT_PROTOCOL_V0` is only used in `ConnectProtocolCompatibility.fromProtocolVersion()`, I think we shouldn't depend on the version to compute `ConnectProtocolCompatibility` because every time we bump the version we should change the method, maybe we can add a field in the ExtendedWorkerMetadata.json to represent the corresponding `ConnectProtocolCompatibility`.




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