jeffkbkim commented on code in PR #15446:
URL: https://github.com/apache/kafka/pull/15446#discussion_r1539809862


##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupMetadataManager.java:
##########
@@ -1920,6 +1921,49 @@ public void onLoaded() {
         });
     }
 
+    /**
+     * Called when the partition is unloaded.
+     * ClassicGroup: Complete all awaiting join and sync futures. Transition 
group to Dead.
+     */
+    public void onUnloaded() {
+        groups.values().forEach(group -> {
+            switch (group.type()) {
+                case CONSUMER:
+                    ConsumerGroup consumerGroup = (ConsumerGroup) group;
+                    log.info("[GroupId={}] Unloaded group metadata for group 
epoch {}.",
+                        consumerGroup.groupId(), consumerGroup.groupEpoch());
+                    break;
+                case CLASSIC:
+                    ClassicGroup classicGroup = (ClassicGroup) group;
+                    log.info("[GroupId={}] Unloading group metadata for 
generation {}.",
+                        classicGroup.groupId(), classicGroup.generationId());
+
+                    classicGroup.transitionTo(DEAD);
+                    switch (classicGroup.previousState()) {
+                        case EMPTY:
+                        case DEAD:
+                            break;
+                        case PREPARING_REBALANCE:
+                            classicGroup.allMembers().forEach(member -> {
+                                classicGroup.completeJoinFuture(member, new 
JoinGroupResponseData()
+                                    .setMemberId(member.memberId())
+                                    .setErrorCode(NOT_COORDINATOR.code()));
+                            });
+
+                            break;
+                        case COMPLETING_REBALANCE:
+                        case STABLE:
+                            classicGroup.allMembers().forEach(member -> {
+                                classicGroup.completeSyncFuture(member, new 
SyncGroupResponseData()
+                                    .setErrorCode(NOT_COORDINATOR.code()));
+                            });
+
+                            removeSyncExpiration(classicGroup);

Review Comment:
   i missed that. thanks for the catch!



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