CCDAK Free Practice Test

is KSQL ANSI SQL compliant?

1. A. Yes
2. B. No

Correct Answer: B
KSQL is not ANSI SQL compliant, for now there are no defined standards on streaming SQL languages

A Zookeeper configuration has tickTime of 2000, initLimit of 20 and syncLimit of 5. What's the timeout value for followers to connect to Zookeeper?

1. A. 20 sec
2. B. 10 sec
3. C. 2000 ms
4. D. 40 sec

Correct Answer: D
tick time is 2000 ms, and initLimit is the config taken into account when establishing a connection to Zookeeper, so the answer is 2000 * 20 = 40000 ms = 40s

You are sending messages with keys to a topic. To increase throughput, you decide to
increase the number of partitions of the topic. Select all that apply.

1. A. All the existing records will get rebalanced among the partitions to balance load
2. B. New records with the same key will get written to the partition where old records with that key were written
3. C. New records may get written to a different partition
4. D. Old records will stay in their partitions

Correct Answer: CD
Increasing the number of partition causes new messages keys to get hashed differently, and breaks the guarantee "same keys goes to the same partition". Kafka logs are immutable and the previous messages are not re-shuffled

What isn't a feature of the Confluent schema registry?

1. A. Store avro data
2. B. Enforce compatibility rules
3. C. Store schemas

Correct Answer: A
Data is stored on brokers.

The rule "same key goes to the same partition" is true unless...

1. A. the number of producer changes
2. B. the number of kafka broker changes
3. C. the number of partition changes
4. D. the replication factor changes

Correct Answer: C
Increasing the number of partition causes new messages keys to get hashed differently, and breaks the guarantee "same keys goes to the same partition". Kafka logs are immutable and the previous messages are not re-shuffled.