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Confluent Certified Developer for Apache Kafka Certification Examination Sample Questions:

1. Which configuration determines how many bytes of data are collected before sending messages to the Kafka broker?

A) max. request.size
B) batch .size
C) buffer, memory
D) send. buffer, bytes

2. StreamsBuilder builder = new StreamsBuilder();
KStream<String, String> textLines = builder.stream("word-count-input"); KTable<String, Long> wordCounts = textLines
.mapValues(textLine -> textLine.toLowerCase())
.flatMapValues(textLine -> Arrays.asList(textLine.split("\W+")))
.selectKey((key, word) -> word)
.groupByKey()
.count(Materialized.as("Counts"));
wordCounts.toStream().to("word-count-output", Produced.with(Serdes.String(), Serdes.Long())); builder.build(); What is an adequate topic configuration for the topic word-count-output?

A) cleanup.policy=delete
B) max.message.bytes=10000000
C) compression.type=lz4
D) cleanup.policy=compact

3. There are 3 brokers in the cluster. You want to create a topic with a single partition that is resilient to one broker failure and one broker maintenance. What is the replication factor will you specify while creating the topic?

A) 2
B) 3
C) 6
D) 1

4. How will you set the retention for the topic named 'Aumy-topic' to 1 hour?

A) Set the producer config retention.ms to 3600000
B) Set the topic config retention.ms to 3600000
C) Set the broker config log.retention.ms to 3600000
D) Set the consumer config retention.ms to 3600000

5. 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.

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

Solutions: