[GitHub] [kafka] chia7712 commented on a diff in pull request #13452: KAFKA-14848: KafkaConsumer incorrectly passes locally-scoped deserializers to FetchConfig

["chia7712 (via GitHub)" <gi...@apache.org>]

chia7712 commented on code in PR #13452:
URL: https://github.com/apache/kafka/pull/13452#discussion_r1149136794


##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/FetchConfig.java:
##########
@@ -101,8 +103,8 @@ public FetchConfig(ConsumerConfig config,
         this.maxPollRecords = config.getInt(ConsumerConfig.MAX_POLL_RECORDS_CONFIG);
         this.checkCrcs = config.getBoolean(ConsumerConfig.CHECK_CRCS_CONFIG);
         this.clientRackId = config.getString(ConsumerConfig.CLIENT_RACK_CONFIG);
-        this.keyDeserializer = keyDeserializer;
-        this.valueDeserializer = valueDeserializer;
+        this.keyDeserializer = Objects.requireNonNull(keyDeserializer, "Message key deserializer provided to FetchConfig should not be null");

Review Comment:
   nit: how about calling another constructor to reduce duplicate code? 
   ```java
           this(config.getInt(ConsumerConfig.FETCH_MIN_BYTES_CONFIG),
                   config.getInt(ConsumerConfig.FETCH_MAX_BYTES_CONFIG),
                   config.getInt(ConsumerConfig.FETCH_MAX_WAIT_MS_CONFIG)
                           ...)
   ```



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