[Solved] What is wrong with this Kafka consumer des... What is wrong with this Kafka consumer deserialization setup?props.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer"); | Kafka

Kafka - Consumers

What is wrong with this Kafka consumer deserialization setup?

props.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
props.put("value.deserializer", "org.apache.kafka.common.serialization.IntegerDeserializer");

ABoth deserializers will be used causing conflict

BNo error, this is valid configuration

CKafka supports multiple deserializers for one value

DDuplicate keys cause the first deserializer to be overwritten

Step-by-Step Solution

Solution:

Step 1: Analyze duplicate property keys in configuration
Setting the same key twice causes the first value to be overwritten by the second.
Step 2: Understand effect on deserialization
Only the last deserializer (IntegerDeserializer) will be used, possibly causing errors if data is string.
Final Answer:
Duplicate keys cause the first deserializer to be overwritten -> Option D
Quick Check:
Duplicate keys overwrite previous values in Properties [OK]

Quick Trick: Duplicate keys overwrite earlier values in Kafka configs [OK]

Common Mistakes:

Thinking both deserializers run together
Assuming Kafka merges deserializers
Believing this is valid multi-deserializer setup

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What is wrong with this Kafka consumer deserialization setup?

Step 1: Analyze duplicate property keys in configuration

Step 2: Understand effect on deserialization

Final Answer:

Quick Check:

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