dajac commented on code in PR #23896:
URL: https://github.com/apache/kafka/pull/23896#discussion_r4422226992


##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/modern/GroupSpecImpl.java:
##########
@@ -28,13 +28,12 @@
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Objects;
-import java.util.Optional;
 import java.util.Set;
 
 /**
  * The assignment specification for a modern group.
  */
-public class GroupSpecImpl implements GroupSpec {
+public abstract class GroupSpecImpl implements GroupSpec {

Review Comment:
   If we keep this file alone (see my previous comment), we should name it 
`AbstractGroupSpec` or something like this. It is not an full implementation 
anymore.



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