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Confluent CCDAK Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Developing with Kafka Consumers | 15-20% | - Consumer Groups and Rebalancing - Deserialization - Commit Strategies (Auto, Manual, Cooperative) - Consumer Configuration and Tuning - Multi-threaded Consumers - Offset Management - Consumer Interceptors |
| Kafka Connect | 10-15% | - Connector Configuration - Offset Management in Connect - Source and Sink Connectors - Single Message Transformations (SMT) - Converters and Transforms - Connect Architecture (Workers, Connectors, Tasks) |
| Schema Management | 5-10% | - Schema Registry Architecture - Schema Registration and Retrieval - Avro Schemas - Protobuf and JSON Schemas - Schema Evolution and Compatibility |
| Kafka Streams | 20-25% | - Interactive Queries - State Stores and Processors - Exactly-Once Processing - Testing Kafka Streams Applications - Streams Architecture and Topology - Transformation Operations (map, filter, join, aggregate) - Windowed Operations (Tumbling, Hopping, Session) |
| Security | 5-10% | - Authorization (ACLs) - Encryption in Transit - Securing Schema Registry - Authentication (SASL, SSL/TLS) |
| Developing with Kafka Producers | 15-20% | - Idempotent Producers - Serialization (JSON, Avro, Protobuf) - Producer Configuration and Tuning - Exactly-Once Semantics - Producer Interceptors - Partitioning Strategies - Error Handling and Retry Logic |
| Kafka Fundamentals | 10-15% | - Log Segments and Retention - Producer and Consumer Basics - Topics, Partitions, and Offsets - Brokers and Clusters - Replication Factor and ISR |
| Monitoring and Operations | 5-10% | - Consumer Lag and Health Checks - Disaster Recovery - Kafka Metrics and Monitoring - Log Compaction - Cross-region Replication |
| Installing and Configuring Kafka | 5-10% | - ZooKeeper vs KRaft Mode - Topic Creation and Configuration - Broker Configuration Parameters - Partition Assignment Strategies |
Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:
Match the testing tool with the type of test it is typically used to perform.
Reveal Solution Discussion 0Correct Answer:
Explanation:
Unit Testing # MockProducer
Integration Testing # Testcontainers
Performance Testing # Trogdor
Mock Data Generation # Connect Datagen
MockProducer: Simulates a Kafka producer in unit tests (no real broker interaction).
Testcontainers: Spawns Kafka in Docker for real environment testing.
Trogdor: Kafka's built-in performance load testing framework.
Connect Datagen: Creates sample source records for test and demo purposes.
From Kafka Developer Tools Guide:
"Kafka developers commonly use MockProducer for unit tests, Testcontainers for integration, and Trogdor for performance tests." Reference: Kafka Testing and Tools Overview
Which two statements are correct when assigning partitions to the consumers in a consumer group using the assign() API?
(Select two.)
- A. The consumer group will not be rebalanced if a consumer leaves the group.
- B. It is mandatory to subscribe to a topic before calling assign() to assign partitions.
- C. The consumer chooses which partition to read without any assignment from brokers.
- D. All topics must have the same number of partitions to use assign() API.
Correct Answer: A,C 🗳️
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(A stream processing application tracks user activity in online shopping carts, including items added, removed, and ordered throughout the day for each user.
You need to capture data to identify possible periods of user inactivity.
Which type of Kafka Streams window should you use?)
- A. Hopping
- B. Sliding
- C. Tumbling
- D. Session
Correct Answer: D 🗳️
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Which configuration allows more time for the consumer poll to process records?
- A. max.poll.interval.ms
- B. heartbeat.interval.ms
- C. fetch.max.wait.ms
- D. session.timeout.ms
Correct Answer: A 🗳️
Explanation: Only visible for ActualCollection members. You can sign-up / login (it's free).
(A consumer application needs to use an at-most-once delivery semantic.
What is the best consumer configuration and code skeleton to avoid duplicate messages being read?)
- A. auto.offset.reset=latest and enable.auto.commit=truewhile (true) {final var records = consumer.poll (POLL_TIMEOUT);for (var record : records) {// Any processing}consumer.commitAsync();}
- B. auto.offset.reset=earliest and enable.auto.commit=falsewhile (true) {final var records = consumer.poll (POLL_TIMEOUT);for (var record : records) {// Any processing}consumer.commitAsync();}
- C. auto.offset.reset=earliest and enable.auto.commit=falsewhile (true) {final var records = consumer.poll (POLL_TIMEOUT);consumer.commitAsync();for (var record : records) {// Any processing}}
- D. auto.offset.reset=earliest and enable.auto.commit=truewhile (true) {final var records = consumer.poll (POLL_TIMEOUT);consumer.commitAsync();for (var record : records) {// Any processing}}
Correct Answer: C 🗳️
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