BewareMyPower commented on code in PR #19031:
URL: https://github.com/apache/pulsar/pull/19031#discussion_r1060257731


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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:
   I just thought again. If we have to use completely new `BatchMessageIdImpl` 
objects in regular cases, i.e. retrieve `MessageId` from `Message`, in the same 
case when `BatchMessageIdImpl` objects are retrieved from deserializations, the 
cache should be cleared.



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