[Solved] Given the following Kafka producer code snippet, what will be the partition number if the topic has 3 partitions?String key = "user123"; String value = "purchase";... | Kafka

Kafka - Producers

Given the following Kafka producer code snippet, what will be the partition number if the topic has 3 partitions?

String key = "user123";
String value = "purchase";
ProducerRecord record = new ProducerRecord<>("orders", key, value);
// Assume default partitioner is used
int partition = record.partition();

APartition 1

BPartition number is null until sent

CPartition 2

DPartition 0

Step-by-Step Solution

Solution:

Step 1: Understand when partition is assigned
Partition is assigned by the Kafka producer's partitioner during send, not when creating the record.
Step 2: Check record.partition() before sending
Calling partition() on a new record returns null if partition not explicitly set.
Final Answer:
Partition number is null until sent -> Option B
Quick Check:
Partition assigned on send, not on record creation [OK]

Quick Trick: Partition is assigned when sending, not on record creation [OK]

Common Mistakes:

Assuming partition is set on record creation
Confusing key hash with partition number
Expecting partition() to return a number before send

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More Kafka Quizzes

Given the following Kafka producer code snippet, what will be the partition number if the topic has 3 partitions?

Step 1: Understand when partition is assigned

Step 2: Check record.partition() before sending

Final Answer:

Quick Check:

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