Code reviewHardcr-g514

Subject IdempotencyLevel Senior–Staff~18 minCommon in Networking & APIs interviewsIndustries Software development, Technology

Question

Review this JavaScript Kafka-style consumer. It should not lose or double-process messages.

What a strong answer looks like

Separate real bugs from style. Rank issues by severity, point at the root cause rather than the symptom, and suggest a concrete fix — specific and kind.

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Talk through your review

Code to reviewjs

1consumer.on('message', async (msg) => {2  await consumer.commitOffset(msg);   // mark consumed3  await processPayment(msg.value);    // do the work4});

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