[Solved] Given this Kafka Streams code snippet, what is the output if a failure occurs before commit?StreamsBuilder builder = new StreamsBuilder(); KStream stream = builder.stream("input-topic"); stream.... | Kafka

Kafka - Advanced Stream Processing

Given this Kafka Streams code snippet, what is the output if a failure occurs before commit?

StreamsBuilder builder = new StreamsBuilder();
KStream stream = builder.stream("input-topic");
stream.mapValues(value -> value.toUpperCase())
      .to("output-topic");
props.put("processing.guarantee", "exactly_once");
KafkaStreams streams = new KafkaStreams(builder.build(), props);
streams.start();
// Failure happens before commit

ASome messages appear duplicated in output-topic

BAll messages appear in uppercase in output-topic

CNo messages appear in output-topic

DMessages appear in original case in output-topic

Step-by-Step Solution

Solution:

Step 1: Understand failure before commit effect
If failure happens before commit, no output is committed, so no messages appear.
Step 2: Check output-topic content
Since commit didn't happen, output-topic remains empty.
Final Answer:
No messages appear in output-topic -> Option C
Quick Check:
Failure before commit = no output [OK]

Quick Trick: Failure before commit means no output committed [OK]

Common Mistakes:

Assuming partial output is visible
Thinking duplicates appear without commit
Ignoring commit timing

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More Kafka Quizzes

Given this Kafka Streams code snippet, what is the output if a failure occurs before commit?

Step 1: Understand failure before commit effect

Step 2: Check output-topic content

Final Answer:

Quick Check:

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