jolshan commented on a change in pull request #11331:
URL: https://github.com/apache/kafka/pull/11331#discussion_r744905470



##########
File path: 
clients/src/main/java/org/apache/kafka/clients/FetchSessionHandler.java
##########
@@ -301,7 +299,9 @@ public FetchRequestData build() {
                 if (nextData != null) {
                     // We basically check if the new partition had the same 
topic ID. If not,
                     // we add it to the "replaced" set.
-                    if (!prevData.topicId.equals(nextData.topicId) && 
!prevData.topicId.equals(Uuid.ZERO_UUID)) {
+                    if (!prevData.topicId.equals(nextData.topicId)
+                            && !prevData.topicId.equals(Uuid.ZERO_UUID)
+                            && !nextData.topicId.equals(Uuid.ZERO_UUID)) {

Review comment:
       I realize we may still want this as if the partition data is exactly the 
same, we will actually ignore the downgrade which is not good.




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