onobc commented on code in PR #18344:
URL: https://github.com/apache/pulsar/pull/18344#discussion_r1020932749


##########
pulsar-client/src/main/java/org/apache/pulsar/client/impl/ConsumerBuilderImpl.java:
##########
@@ -87,7 +87,39 @@ public ConsumerBuilderImpl(PulsarClientImpl client, 
Schema<T> schema) {
 
     @Override
     public ConsumerBuilder<T> loadConf(Map<String, Object> config) {
-        this.conf = ConfigurationDataUtils.loadData(config, conf, 
ConsumerConfigurationData.class);
+        MessageListener<T> messageListener =
+            (MessageListener<T>) config.getOrDefault("messageListener", 
this.conf.getMessageListener());
+        ConsumerEventListener consumerEventListener =
+            (ConsumerEventListener) 
config.getOrDefault("consumerEventListener", 
this.conf.getConsumerEventListener());
+        RedeliveryBackoff negativeAckRedeliveryBackoff = (RedeliveryBackoff) 
config
+            .getOrDefault("negativeAckRedeliveryBackoff", 
this.conf.getNegativeAckRedeliveryBackoff());
+        RedeliveryBackoff ackTimeoutRedeliveryBackoff = (RedeliveryBackoff) 
config
+            .getOrDefault("ackTimeoutRedeliveryBackoff", 
this.conf.getAckTimeoutRedeliveryBackoff());
+        CryptoKeyReader cryptoKeyReader =
+            (CryptoKeyReader) config.getOrDefault("cryptoKeyReader", 
this.conf.getCryptoKeyReader());
+        MessageCrypto messageCrypto =
+            (MessageCrypto) config.getOrDefault("messageCrypto", 
this.conf.getMessageCrypto());
+        BatchReceivePolicy batchReceivePolicy =
+            (BatchReceivePolicy) config.getOrDefault("batchReceivePolicy", 
this.conf.getBatchReceivePolicy());
+        KeySharedPolicy keySharedPolicy =
+            (KeySharedPolicy) config.getOrDefault("keySharedPolicy", 
this.conf.getKeySharedPolicy());
+        MessagePayloadProcessor payloadProcessor =
+            (MessagePayloadProcessor) config.getOrDefault("payloadProcessor", 
this.conf.getPayloadProcessor());
+
+        ConsumerConfigurationData<T> configurationData =
+            ConfigurationDataUtils.loadData(config, conf, 
ConsumerConfigurationData.class);
+
+        configurationData.setMessageListener(messageListener);
+        configurationData.setConsumerEventListener(consumerEventListener);
+        
configurationData.setNegativeAckRedeliveryBackoff(negativeAckRedeliveryBackoff);
+        
configurationData.setAckTimeoutRedeliveryBackoff(ackTimeoutRedeliveryBackoff);

Review Comment:
   In that case we could use `@JsonTypeInfo` + `@JsonSubTypes` in a mix-in. 
This would work well as long as we know about all of the RB impls. 
   
   NOTE: Whatever we do for RB could apply to the 
`ClientConfigurationData.authentication` as it  also currently ignored and is 
also an interface. There may be other fields as well. 



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