BewareMyPower commented on code in PR #23582:
URL: https://github.com/apache/pulsar/pull/23582#discussion_r1837395036


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pulsar-client/src/main/java/org/apache/pulsar/client/impl/NegativeAcksTracker.java:
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@@ -30,15 +30,17 @@
 import java.util.concurrent.TimeUnit;
 import org.apache.pulsar.client.api.Message;
 import org.apache.pulsar.client.api.MessageId;
+import org.apache.pulsar.client.api.MessageIdAdv;
 import org.apache.pulsar.client.api.RedeliveryBackoff;
 import org.apache.pulsar.client.impl.conf.ConsumerConfigurationData;
+import org.apache.pulsar.common.util.collections.ConcurrentLongLongPairHashMap;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 class NegativeAcksTracker implements Closeable {
     private static final Logger log = 
LoggerFactory.getLogger(NegativeAcksTracker.class);
 
-    private HashMap<MessageId, Long> nackedMessages = null;
+    private ConcurrentLongLongPairHashMap nackedMessages = null;

Review Comment:
   Yes, `LongLongPair` can be used to replace `Pair<Long, Long>`.
   
   ```java
   public class LongLongImmutablePair implements LongLongPair, Serializable {
       private static final long serialVersionUID = 0L;
       protected final long left;
       protected final long right;
   ```



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