squah-confluent commented on code in PR #22713:
URL: https://github.com/apache/kafka/pull/22713#discussion_r3506840712


##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/util/UpdatedMembersAndTargetAssignmentView.java:
##########
@@ -85,12 +85,28 @@ public Map<String, A> targetAssignment() {
      * member for the same instance id, the previous static member's target 
assignment is moved to
      * the new member and the previous static member is removed from the view.
      *
-     * @param memberId   The member id.
-     * @param instanceId The instance id of the member, or {@code null} if the 
member is not static.
-     * @param member     The member to add or update.
+     * @param memberId           The member id.
+     * @param previousInstanceId The instance id the member had before the 
update, or {@code null}
+     *                           if the member was not static.
+     * @param instanceId         The instance id of the member, or {@code 
null} if the member is not
+     *                           static.
+     * @param member             The member to add or update.
      */
-    public void addOrUpdateMember(String memberId, String instanceId, M 
member) {
+    public void addOrUpdateMember(
+        String memberId,
+        String previousInstanceId,

Review Comment:
   Thanks for reviewing. I tried that instead and removed the `instanceId` 
parameters entirely.



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