BewareMyPower commented on code in PR #19031:
URL: https://github.com/apache/pulsar/pull/19031#discussion_r1059232127


##########
pulsar-client/src/main/java/org/apache/pulsar/client/impl/ConsumerImpl.java:
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@@ -204,6 +208,10 @@
 
     private final AtomicReference<ClientCnx> 
clientCnxUsedForConsumerRegistration = new AtomicReference<>();
     private final List<Throwable> previousExceptions = new 
CopyOnWriteArrayList<Throwable>();
+    // Key is the ledger id and the entry id, entry is the acker that 
represents which single messages are acknowledged
+    private final ConcurrentNavigableMap<Pair<Long, Long>, BatchMessageAcker> 
batchMessageToAcker =

Review Comment:
   The `batchMessageAckTracker` before 
https://github.com/apache/pulsar/pull/1424 is updated for each message received:
   
   ```java
       void receiveIndividualMessagesFromBatch(MessageMetadata msgMetadata, 
ByteBuf uncompressedPayload,
               MessageIdData messageId, ClientCnx cnx) {
           /* ... */
           batchMessageAckTracker.put(batchMessage, bitSet);
   ```
   
   But the `batchMessageToAcker` in this PR will be updated only for 
acknowlegment.



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