Copilot commented on code in PR #24725:
URL: https://github.com/apache/pulsar/pull/24725#discussion_r2336840102
##########
pulsar-client/src/main/java/org/apache/pulsar/client/impl/PersistentAcknowledgmentsGroupingTracker.java:
##########
@@ -484,16 +483,15 @@ private void flushAsync(ClientCnx cnx) {
}
}
- if (!pendingIndividualBatchIndexAcks.isEmpty()) {
- Iterator<Map.Entry<MessageIdAdv, ConcurrentBitSetRecyclable>>
iterator =
- pendingIndividualBatchIndexAcks.entrySet().iterator();
-
- while (iterator.hasNext()) {
- Map.Entry<MessageIdAdv, ConcurrentBitSetRecyclable> entry =
iterator.next();
- entriesToAck.add(Triple.of(
- entry.getKey().getLedgerId(),
entry.getKey().getEntryId(), entry.getValue()));
- iterator.remove();
+ while (!pendingIndividualBatchIndexAcks.isEmpty()) {
+ Map.Entry<MessageIdAdv, ConcurrentBitSetRecyclable> entry =
+ pendingIndividualBatchIndexAcks.pollFirstEntry();
+ if (entry == null) {
+ // The entry has been removed in a different thread
Review Comment:
The check `!pendingIndividualBatchIndexAcks.isEmpty()` in the while
condition creates a race condition. Another thread could remove the last entry
between the isEmpty() check and pollFirstEntry() call, causing unnecessary loop
iterations. Consider using `while (true)` and relying solely on the null check
from `pollFirstEntry()`.
```suggestion
while (true) {
Map.Entry<MessageIdAdv, ConcurrentBitSetRecyclable> entry =
pendingIndividualBatchIndexAcks.pollFirstEntry();
if (entry == null) {
```
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