dajac commented on code in PR #15587:
URL: https://github.com/apache/kafka/pull/15587#discussion_r1557570573


##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupMetadataManager.java:
##########
@@ -2415,6 +2415,22 @@ private CoordinatorResult<Void, Record> 
classicGroupJoinExistingMember(
         return EMPTY_RESULT;
     }
 
+    /**
+     * An overload of {@link 
GroupMetadataManager#completeClassicGroupJoin(ClassicGroup)} used as
+     * timeout operation. It additionally looks up the group by the id and 
checks the group type.
+     * completeClassicGroupJoin will only be called if the group is CLASSIC.
+     */
+    private CoordinatorResult<Void, Record> completeClassicGroupJoin(String 
groupId) {
+        ClassicGroup group;
+        try {
+            group = getOrMaybeCreateClassicGroup(groupId, false);
+        } catch (UnknownMemberIdException | GroupIdNotFoundException 
exception) {

Review Comment:
   I actually wonder whether raising `GroupIdNotFoundException` in 
`getOrMaybeCreateClassicGroup` is correct. It is likely not expected on the 
join-group and the sync-group paths. @jeffkbkim What do you think? We don't 
have to address this in this PR.



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