Confluent Exam CCDAK Topic 4 Question 74 Discussion

Actual exam question for Confluent's CCDAK exam

Question #: 74
Topic #: 4

[All CCDAK Questions]

Compaction is enabled for a topic in Kafka by setting log.cleanup.policy=compact. What is true about log compaction?

AAfter cleanup, only one message per key is retained with the first value

BEach message stored in the topic is compressed

CKafka automatically de-duplicates incoming messages based on key hashes

DAfter cleanup, only one message per key is retained with the latest value
Compaction changes the offset of messages

Show Suggested Answer

Suggested Answer: C

Kafka's new bidirectional client compatibility introduced in 0.10.2 allows this. Read more herehttps://www.confluent.io/blog/upgrading-apache-kafka-clients-just-got-easier/

by Helaine at Feb 08, 2025, 07:36 PM

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Cristina

2 months ago

Haha, I bet the exam writers are trying to trick us with these options. Kafka is all about distributed logging, so 'compaction' must be some sort of magic that makes it all work, right?

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Leanna

8 days ago

Compaction changes the offset of messages

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Jackie

23 days ago

D) After cleanup, only one message per key is retained with the latest value

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Rolande

1 months ago

A) After cleanup, only one message per key is retained with the first value

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Jeannetta

2 months ago

This is a tricky one. I know compaction changes the offsets, so I'm not sure if option A or D is the right choice. I'll have to think about this one more.

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Carmelina

2 months ago

I'm a bit confused. Isn't log compaction supposed to compress the messages as well? Option B seems like it could be the answer.

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Orville

1 months ago

User 2: Orville is right. Log compaction actually removes duplicate keys and retains the latest value.

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Gilma

2 months ago

User 1: Option B is not correct. Log compaction does not compress messages.

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Lorrie

2 months ago

Hmm, I was thinking option C was the right answer. Doesn't Kafka de-duplicate messages based on the key hash during log compaction?

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Xochitl

2 months ago

I'm not sure about this. I think the answer might be A) After cleanup, only one message per key is retained with the first value. It could be more efficient to keep the initial value for each key.

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Torie

2 months ago

I think option D is the correct answer. Log compaction retains only the latest value for each unique key.

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Gracia

23 days ago

Compaction changes the offset of messages

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Jacqueline

25 days ago

D) After cleanup, only one message per key is retained with the latest value

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Virgie

2 months ago

A) After cleanup, only one message per key is retained with the first value

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Mireya

2 months ago

I agree with Lewis. It's important to retain the latest value for each key after compaction to ensure the most up-to-date information is available in the topic.

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Lewis

2 months ago

I think the answer is D) After cleanup, only one message per key is retained with the latest value. It makes sense to keep the most recent value for each key.

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