kkoderok commented on code in PR #13339:
URL: https://github.com/apache/pulsar/pull/13339#discussion_r841390236


##########
pulsar-proxy/src/main/java/org/apache/pulsar/proxy/server/ProxyConnection.java:
##########
@@ -439,11 +451,65 @@ ClientConfigurationData createClientConfiguration() 
throws UnsupportedAuthentica
     private PulsarClientImpl createClient(final ClientConfigurationData 
clientConf, final AuthData clientAuthData,
             final String clientAuthMethod, final int protocolVersion) throws 
PulsarClientException {
         this.connectionPool = new ProxyConnectionPool(clientConf, 
service.getWorkerGroup(),
-                () -> new ProxyClientCnx(clientConf, service.getWorkerGroup(), 
clientAuthRole, clientAuthData,
-                        clientAuthMethod, protocolVersion));
+            () -> new ProxyClientCnx(clientConf, service.getWorkerGroup(), 
clientAuthRole,
+                this::getOrRefreshClientAuthData, clientAuthMethod, 
protocolVersion,
+                
service.getConfiguration().isForwardAuthorizationCredentials()));
         return new PulsarClientImpl(clientConf, service.getWorkerGroup(), 
connectionPool, service.getTimer());
     }
 
+    private void updateClientAuthData(AuthData clientData) {
+        this.clientAuthData = clientData;
+        authFutureList.getAndSet(Collections.emptyList())
+            .forEach(future -> future.complete(clientData));
+    }
+
+    private CompletableFuture<AuthData> getOrRefreshClientAuthData() {

Review Comment:
   When client auth data expired and proxy configured with forward 
authentication data, then this method requests a new token. This method is 
thread safe, because one ProxyConnection has multiple ProxyClientCnx, and 
potentially at same time, they request
   auth data.



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