chia7712 commented on code in PR #20060:
URL: https://github.com/apache/kafka/pull/20060#discussion_r2173480231


##########
streams/src/main/java/org/apache/kafka/streams/internals/metrics/OpenIterators.java:
##########
@@ -50,24 +48,22 @@ public OpenIterators(final TaskId taskId,
 
     public void add(final MeteredIterator iterator) {
         openIterators.add(iterator);
-        numOpenIterators.increment();
 
-        if (numOpenIterators.intValue() == 1) {
+        if (openIterators.size() == 1) {

Review Comment:
   I was worried for adding the same `iterator`, which could create unexpected 
metrics, but it seems `StateStoreMetrics.addOldestOpenIteratorGauge` already 
handle this case.



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