[Solved] What is wrong with this Kafka consumer configuration for static group membership?props.put("group.instance.id", "consumer-1"); props.put("group.instance.id", "consumer-1"); | Kafka

Kafka - Consumer Groups

What is wrong with this Kafka consumer configuration for static group membership?

props.put("group.instance.id", "consumer-1");
props.put("group.instance.id", "consumer-1");

AMissing 'group.id' property to identify the consumer group

BDuplicate keys for 'group.instance.id' will cause the last value to override the first

C'group.instance.id' values must be numeric, not strings

DStatic membership requires setting 'enable.auto.commit' to false

Step-by-Step Solution

Solution:

Step 1: Analyze the configuration snippet
The snippet sets 'group.instance.id' twice with the same key.
Step 2: Understand Java Properties behavior
In Java Properties, duplicate keys overwrite previous values, so only the last 'group.instance.id' will be used.
Final Answer:
Duplicate keys for 'group.instance.id' will cause the last value to override the first -> Option B
Quick Check:
Check for duplicate keys in Properties [OK]

Quick Trick: Avoid duplicate keys in Properties to prevent overwriting [OK]

Common Mistakes:

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What is wrong with this Kafka consumer configuration for static group membership?