[Solved] You want to send two messages atomically to two different topics using a Kafka transactional producer. Which sequence of calls is correct?// Assume producer is configured with transactional.... | Kafka

Kafka - Message Delivery Semantics

You want to send two messages atomically to two different topics using a Kafka transactional producer. Which sequence of calls is correct?

// Assume producer is configured with transactional.id
producer.initTransactions();
// What is the correct order?

AbeginTransaction(); send(topic1); send(topic2); commitTransaction();

Bsend(topic1); beginTransaction(); send(topic2); commitTransaction();

CbeginTransaction(); send(topic1); commitTransaction(); send(topic2);

Dsend(topic1); send(topic2); beginTransaction(); commitTransaction();

Step-by-Step Solution

Solution:

Step 1: Understand transaction boundaries
beginTransaction() must be called before sending any messages to start the transaction.
Step 2: Send all messages within the transaction and then commit
Both messages must be sent after beginTransaction() and before commitTransaction() to be atomic.
Final Answer:
beginTransaction(); send(topic1); send(topic2); commitTransaction(); -> Option A
Quick Check:
Start transaction, send all, then commit [OK]

Quick Trick: Begin transaction before sends, commit after all sends [OK]

Common Mistakes:

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