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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions (Q157-Q162):

NEW QUESTION # 157
How often is log compaction evaluated?

A. Every time a segment is closed
B. Every time a new partition is created
C. Every time a message is flushed to disk
D. Every time a message is sent to Kafka

Answer: A

Explanation:
Log compaction is evaluated every time a segment is closed. It will be triggered if enough data is "dirty" (see dirty ratio config)

NEW QUESTION # 158
Compaction is enabled for a topic in Kafka by setting log.cleanup.policy=compact. What is true about log compaction?

A. Kafka automatically de-duplicates incoming messages based on key hashes
B. After cleanup, only one message per key is retained with the first value
C. After cleanup, only one message per key is retained with the latest value Compaction changes the offset of messages
D. Each message stored in the topic is compressed

Answer: C

Explanation:
Log compaction retains at least the last known value for each record key for a single topic partition. All compacted log offsets remain valid, even if record at offset has been compacted away as a consumer will get the next highest offset.

NEW QUESTION # 159
A topic has three replicas and you set min.insync.replicas to 2. If two out of three replicas are not available, what happens when a produce request with acks=all is sent to broker?

A. NotEnoughReplicasException will be returned
B. Produce request is honored with single in-sync replica
C. Produce request will block till one of the two unavailable partition is available again.

Answer: A

Explanation:
With this configuration, a single in-sync replica becomes read-only. Produce request will receive NotEnoughReplicasException.

NEW QUESTION # 160
What is the difference between exactly once semantics (EOS) and idempotence?

A. Idempotence Is any function that can be executed several times without changing the final result beyond its first iteration. EOS sends an update once and only one time.
B. Idempotence sends an update multiple times and only keeps the latest update EOS requests get sent multiple times, but only the first request is accepted.
C. Idempotence sends updates multiple times and stores the first value. EOS sends updates multiple times and stores the latest value.
D. Idempotence sends an update once and only one item. EOS is any function that can be executed several times without changing the final result beyond its first iteration

Answer: A

NEW QUESTION # 161
Which topic stores the sink connector offsets?

A. _consumer_offset
B. Topic name from status.storage.topic
C. Topic name from offset.storage.topic
D. Topic name from config.storage.topic

Answer: C

NEW QUESTION # 162
......

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