CalvinConfluent commented on code in PR #16075:
URL: https://github.com/apache/kafka/pull/16075#discussion_r1617983719


##########
storage/src/main/java/org/apache/kafka/storage/internals/log/ProducerStateManager.java:
##########
@@ -369,16 +369,21 @@ private boolean isProducerExpired(long currentTimeMs, 
ProducerStateEntry produce
      * Also expire any verification state entries that are lingering as 
unverified.
      */
     public void removeExpiredProducers(long currentTimeMs) {
-        List<Long> keys = producers.entrySet().stream()
-                .filter(entry -> isProducerExpired(currentTimeMs, 
entry.getValue()))
-                .map(Map.Entry::getKey)
-                .collect(Collectors.toList());
+        List<Long> keys = new ArrayList<>();

Review Comment:
   Updated. There is a significant improvement!



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