合格目指せCCDAK試験最新のCCDAK試験問題集PDF 2025年更新
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CCDAK試験は、エンタープライズ版Kafkaを提供するConfluent社が作成し、世界中で利用可能です。この認定試験は、メッセージ分配、ストリーム処理、Kafkaエコシステムツールなど、さまざまなKafka関連トピックにおけるKafka開発者のスキル、専門知識、知識を検証するために設計されています。CCDAK試験に合格することは、効率的でスケーラブル、信頼性の高いKafkaベースのアプリケーションを構築するために使用できるKafkaコンセプトの実用的な理解を開発者が持っていることを示す重要な業績です。
Confluent CCDAK試験に備えて、開発者はConfluent Developer Trainingに参加するか、Udemyで利用可能なConfluent Cloud Fundamentals for Developersコースなどのオンラインコースを受講することができます。彼らはまた、公式ドキュメントを参照し、Kafkaクラスタ、プロデューサー、およびコンシューマーを使用して練習することができます。また、認定試験に備えて開発者が練習できるオンラインの模擬試験もあります。
質問 # 102
What is the disadvantage of request/response communication?
- A. Reliability
- B. Scalability
- C. Coupling
- D. Cost
正解：C
解説：
Point-to-point (request-response) style will couple client to the server.
質問 # 103
You use Kafka Connect with the JDBC source connector to extract data from a large database and push it into Kafka.
The database contains tens of tables, and the current connector is unable to process the data fast enough.
You add more Kafka Connect workers, but throughput doesn't improve.
What should you do next?
- A. Add more Kafka brokers to the cluster.
- B. Increase the value of the connector's property tasks.max.
- C. Modify the database schemas to enable horizontal sharding.
- D. Increase the number of Kafka partitions for the topics.
正解：B
解説：
Increasingtasks.maxallows the connector to createmultiple tasks, each responsible for processing different tables or table partitions. If onlyone taskis used,adding more workers has no effect.
FromKafka Connect JDBC Connector Docs:
"Use tasks.max to configure how many tasks are created for the connector. Each task can process a subset of the data."
* A and C help only if the bottleneck is in Kafka, not Connect.
* D is a large architectural change, not the first step.
Reference:Kafka Connect JDBC Connector Configuration
質問 # 104
You want to sink data from a Kafka topic to S3 using Kafka Connect. There are 10 brokers in the cluster, the topic has 2 partitions with replication factor of 3. How many tasks will you configure for the S3 connector?
- A. 0
- B. 1
- C. 2
- D. 3
正解：A
解説：
You cannot have more sink tasks (= consumers) than the number of partitions, so 2.
質問 # 105
A bank uses a Kafka cluster for credit card payments. What should be the value of the property unclean.leader.election.enable?
- A. FALSE
- B. TRUE
正解：A
解説：
Setting unclean.leader.election.enable to true means we allow out-of-sync replicas to become leaders, we will lose messages when this occurs, effectively losing credit card payments and making our customers very angry.
質問 # 106
When is the onCompletion() method called?
private class ProducerCallback implements Callback {
@Override
public void onCompletion(RecordMetadata recordMetadata, Exception e) {
if (e != null) {
e.printStackTrace();
}
}
}
ProducerRecord<String, String> record =
new ProducerRecord<>("topic1", "key1", "value1");
producer.send(record, new ProducerCallback());
- A. When message is serialized successfully
- B. When send() method is called
- C. When the broker response is received
- D. When the message is partitioned and batched successfully
正解：C
解説：
Callback is invoked when a broker response is received.
質問 # 107
Which of the following errors are retriable from a producer perspective? (select two)
- A. NOT_LEADER_FOR_PARTITION
- B. NOT_ENOUGH_REPLICAS
- C. TOPIC_AUTHORIZATION_FAILED
- D. MESSAGE_TOO_LARGE
- E. INVALID_REQUIRED_ACKS
正解：A、B
解説：
Both of these are retriable errors, others non-retriable errors. See the full list of errors and their "retriable" status herehttps://kafka.apache.org/protocol#protocol_error_codes
質問 # 108
What's is true about Kafka brokers and clients from version 0.10.2 onwards?
- A. Clients and brokers must have the exact same version to be able to communicate
- B. A newer client can't talk to a newer broker, but an older client can talk to a newer broker
- C. A newer client can talk to a newer broker, and an older client can talk to a newer broker
- D. A newer client can talk to a newer broker, but an older client cannot talk to a newer broker
正解：C
解説：
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/
質問 # 109
Which configuration determines how many bytes of data are collected before sending messages to the Kafka broker?
- A. buffer.memory
- B. send.buffer.bytes
- C. batch.size
- D. max.block.size
正解：C
解説：
Thebatch.sizeconfig sets themaximum number of bytes to batch per partitionbefore sending. This allows Kafka producers toamortize I/Oand improve throughput.
FromKafka Producer Configuration Docs:
"batch.size is the maximum amount of data per partition the producer will batch before sending."
* buffer.memory sets total memory for the producer, not per-batch.
* send.buffer.bytes is aTCP socket buffer, not a Kafka config.
* max.block.ms controls blocking time, not size.
Reference:Kafka Producer Configs > batch.size
質問 # 110
You need to explain the best reason to implement the consumer callback interface ConsumerRebalanceListener prior to a Consumer Group Rebalance.
Which statement is correct?
- A. Partitions assigned to a consumer may change.
- B. Previous log files are deleted.
- C. Offsets are compacted.
- D. Partition leaders may change.
正解：A
解説：
The ConsumerRebalanceListener lets youhandle partition assignments and revocationsduring rebalances.
This is critical for managingoffsets,stateful processing, orexternal transactions.
FromKafka Consumer Rebalance Docs:
"Implementing ConsumerRebalanceListener allows your application to take action before and after partitions are reassigned."
* A is true: It lets your app react when partitionsassigned to the consumer change.
* B, C, and D are unrelated to consumer rebalancing directly.
Reference:Kafka Consumer JavaDocs > ConsumerRebalanceListener
質問 # 111
If I supply the setting compression.type=snappy to my producer, what will happen? (select two)
- A. The Consumers have to de-compress the data
- B. The Kafka brokers have to de-compress the data
- C. The Kafka brokers have to compress the data
- D. The Consumers have to compress the data
- E. The Producers have to compress the data
正解：A
解説：
Kafka transfers data with zero copy and no transformation. Any transformation (including compression) is the responsibility of clients.
質問 # 112
Which of the following is true regarding thread safety in the Java Kafka Clients?
- A. One Producer can be safely used in multiple threads
- B. One Consumer needs to run in one thread
- C. One Producer needs to be run in one thread
- D. One Consumer can be safely used in multiple threads
正解：A、B
解説：
KafkaConsumer is not thread-safe, KafkaProducer is thread safe.
質問 # 113
To continuously export data from Kafka into a target database, I should use
- A. Kafka Producer
- B. Kafka Streams
- C. Kafka Connect Sink
- D. Kafka Connect Source
正解：C
解説：
Kafka Connect Sink is used to export data from Kafka to external databases and Kafka Connect Source is used to import from external databases into Kafka.
質問 # 114
A topic "sales" is being produced to in the Americas region. You are mirroring this topic using Mirror Maker to the European region. From there, you are only reading the topic for analytics purposes. What kind of mirroring is this?
- A. Active-Passive
- B. Active-Active
- C. Passive-Passive
正解：A
解説：
This is active-passing as the replicated topic is used for read-only purposes only
質問 # 115
How much should be the heap size of a broker in a production setup on a machine with 256 GB of RAM, in PLAINTEXT mode?
- A. 16 GB
- B. 512 MB
- C. 4 GB
- D. 128 GB
正解：C
解説：
In Kafka, a small heap size is needed, while the rest of the RAM goes automatically to the page cache (managed by the OS). The heap size goes slightly up if you need to enable SSL
質問 # 116
What is the risk of increasing max.in.flight.requests.per.connection while also enabling retries in a producer?
- A. At least once delivery is not guaranteed
- B. Less resilient
- C. Reduce throughput
- D. Message order not preserved
正解：D
解説：
Some messages may require multiple retries. If there are more than 1 requests in flight, it may result in messages received out of order. Note an exception to this rule is if you enable the producer settingenable.idempotence=true which takes care of the out of ordering case on its own. Seehttps://issues.apache.org/jira/browse/KAFKA-5494
質問 # 117
Which SMTs is used to change the data type?
- A. org.apache.kafka.connect.transforms.TimestampRouter
- B. io.confluent.connect.transforms.TombstoneHandler
- C. org.apache.kafka.connect.transforms.Flatten
- D. org.apache.kafka.connect.transforms.Cast
正解：D
質問 # 118
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