BewareMyPower commented on code in PR #24465:
URL: https://github.com/apache/pulsar/pull/24465#discussion_r2168017302


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pulsar-proxy/src/main/java/org/apache/pulsar/proxy/server/LookupProxyHandler.java:
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@@ -85,6 +87,9 @@ public class LookupProxyHandler {
             .create().register();
     private final Semaphore lookupRequestSemaphore;
 
+    // Maps the topic name from the request to the full topic name
+    private final Map<String, String> topicNameCache = new HashMap<>();

Review Comment:
   <img width="1277" alt="image" 
src="https://github.com/user-attachments/assets/79c1fe1e-c78a-460a-b15f-4aab1572c102";
 />
   
   Well, if there are 500k keys, `TopicName#get` is slower.
   
   ```
   TopicNameBenchmark.testConvert        thrpt       5.857          ops/s
   TopicNameBenchmark.testReadFromCache  thrpt       5.326          ops/s
   ```
   
   



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