kirktrue commented on code in PR #21484:
URL: https://github.com/apache/kafka/pull/21484#discussion_r2819801604


##########
clients/src/main/java/org/apache/kafka/clients/admin/Admin.java:
##########
@@ -1229,7 +1229,7 @@ default ListPartitionReassignmentsResult 
listPartitionReassignments(
     }
 
     /**
-     * List all of the current partition reassignments
+     * List all the current partition reassignments

Review Comment:
   ```suggestion
        * List all the current partition reassignments.
   ```



##########
clients/src/main/java/org/apache/kafka/clients/admin/AlterConfigOp.java:
##########
@@ -76,10 +79,18 @@ public enum OpType {
             this.id = id;
         }
 
+        /**
+         * Returns the byte ID associated with this operation type. This ID is 
used for serialization 
+         * and protocol communication.
+         */
         public byte id() {
             return id;
         }
 
+        /**
+         * Returns the {@code OpType} corresponding to the given byte ID, or 
{@code null} if the
+         * ID does not match any known operation type.

Review Comment:
   Interesting that it returns `null` as opposed to throwing an 
`IllegalArgumentException` like many of the other string/integer -> enum 
methods do 🤔 



##########
clients/src/main/java/org/apache/kafka/clients/admin/Admin.java:
##########
@@ -1250,6 +1250,8 @@ default ListPartitionReassignmentsResult 
listPartitionReassignments(ListPartitio
     }
 
     /**
+     * List all the current partition reassignments

Review Comment:
   Ditto as above.



##########
clients/src/main/java/org/apache/kafka/clients/admin/ClassicGroupDescription.java:
##########
@@ -91,23 +122,21 @@ public String groupId() {
     }
 
     /**
-     * The group protocol type.
+     * The group protocol type, or the empty string.

Review Comment:
   It doesn't look like there's anything preventing a `null` from being passed 
to the constructor for `protocol`. `protocolData` is forced to an empty string, 
but `protocol` is not 🤔 



##########
clients/src/main/java/org/apache/kafka/clients/admin/ClassicGroupDescription.java:
##########
@@ -91,23 +122,21 @@ public String groupId() {
     }
 
     /**
-     * The group protocol type.
+     * The group protocol type, or the empty string.
      */
     public String protocol() {
         return protocol;
     }
 
     /**
-     * The group protocol data. The meaning depends on the group protocol type.
-     * For a classic consumer group, this is the partition assignor name.
-     * For a classic connect group, this indicates which Connect protocols are 
enabled.
+     * The group protocol data.

Review Comment:
   Is the detail in the previous description for this method incorrect now?



##########
clients/src/main/java/org/apache/kafka/clients/admin/AlterConfigOp.java:
##########
@@ -76,10 +79,18 @@ public enum OpType {
             this.id = id;
         }
 
+        /**
+         * Returns the byte ID associated with this operation type. This ID is 
used for serialization 

Review Comment:
   We should be consistent, if possible. Either choose `id` or `ID`, preferably 
the latter.



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