chia7712 commented on code in PR #17353:
URL: https://github.com/apache/kafka/pull/17353#discussion_r1792192026


##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/AsyncKafkaConsumer.java:
##########
@@ -1072,12 +1073,10 @@ public Map<TopicPartition, OffsetAndTimestamp> 
offsetsForTimes(Map<TopicPartitio
             }
 
             try {
-                return applicationEventHandler.addAndGet(listOffsetsEvent)
-                    .entrySet()
-                    .stream()
-                    .collect(Collectors.toMap(
-                        Map.Entry::getKey,
-                        entry -> entry.getValue().buildOffsetAndTimestamp()));
+                Map<TopicPartition, OffsetAndTimestampInternal> offsets = 
applicationEventHandler.addAndGet(listOffsetsEvent);
+                Map<TopicPartition, OffsetAndTimestamp> results = new 
HashMap<>(offsets.size());
+                offsets.forEach((k, v) -> results.put(k, v != null ? 
v.buildOffsetAndTimestamp() : null));

Review Comment:
   >  What if the user calls Map.containsKey(), though? Without explicitly 
adding a null, containsKey() will return false. Is that the expectation? 🤔
   
   I'm not sure why users would need this use case. Storing null in a map seems 
like a design flaw to me. Additionally, Admin#listOffsets doesn't return null 
values.



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