chia7712 commented on a change in pull request #9748:
URL: https://github.com/apache/kafka/pull/9748#discussion_r542962306



##########
File path: 
generator/src/main/java/org/apache/kafka/message/ApiMessageTypeGenerator.java
##########
@@ -169,7 +169,7 @@ private void generateEnumValues() {
     }
 
     private void generateInstanceVariables() {
-        buffer.printf("private final String name;%n");
+        buffer.printf("public final String name;%n");

Review comment:
       It is a bit weird that ```messageType.name``` and 
```messageType.name()``` return different string.

##########
File path: 
clients/src/test/java/org/apache/kafka/common/message/MessageTest.java
##########
@@ -952,40 +904,6 @@ public String toString() {
         }
     }
 
-    private static void compareTypes(Schema schemaA, Schema schemaB) {
-        compareTypes(new NamedType("schemaA", schemaA),
-                     new NamedType("schemaB", schemaB));
-    }
-
-    private static void compareTypes(NamedType typeA, NamedType typeB) {
-        List<NamedType> listA = flatten(typeA);
-        List<NamedType> listB = flatten(typeB);
-        if (listA.size() != listB.size()) {
-            throw new RuntimeException("Can't match up structures: typeA has " 
+
-                Utils.join(listA, ", ") + ", but typeB has " +
-                Utils.join(listB, ", "));
-        }
-        for (int i = 0; i < listA.size(); i++) {
-            NamedType entryA = listA.get(i);
-            NamedType entryB = listB.get(i);
-            if (!entryA.hasSimilarType(entryB)) {
-                throw new RuntimeException("Type " + entryA + " in schema A " +
-                    "does not match type " + entryB + " in schema B.");
-            }
-            if (entryA.type.isNullable() != entryB.type.isNullable()) {
-                throw new RuntimeException(String.format(
-                    "Type %s in Schema A is %s, but type %s in " +
-                        "Schema B is %s",
-                    entryA, entryA.type.isNullable() ? "nullable" : 
"non-nullable",
-                    entryB, entryB.type.isNullable() ? "nullable" : 
"non-nullable"));
-            }
-            if (entryA.type.isArray()) {
-                compareTypes(new NamedType(entryA.name, 
entryA.type.arrayElementType().get()),
-                             new NamedType(entryB.name, 
entryB.type.arrayElementType().get()));
-            }
-        }
-    }
-
     /**

Review comment:
       this method is never used.

##########
File path: clients/src/main/java/org/apache/kafka/common/protocol/ApiKeys.java
##########
@@ -343,9 +174,15 @@ public Struct parseResponse(short version, ByteBuffer 
buffer) {
                 throw new IllegalStateException("Response schema for api " + 
name + " for version " + i + " is null");
         }
 
+        this.messageType = messageType;
+        this.id = id;
+        this.name = name;

Review comment:
       Could we fix the comment about "name" as it is used to be a part of 
metrics name (see 
https://github.com/apache/kafka/blob/trunk/core/src/main/scala/kafka/network/RequestChannel.scala#L239).
 The origin comment is stale.




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