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Download Confluent Certified Developer for Apache Kafka Certification Examination Exam Dumps
NEW QUESTION 32
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. compression.type=lz4
- B. cleanup.policy=delete
- C. cleanup.policy=compact
- D. max.message.bytes=10000000
Answer: C
Explanation:
Result is aggregated into a table with key as the unique word and value its frequency. We have to enable log compaction for this topic to align the topic's cleanup policy with KTable semantics.
NEW QUESTION 33
You want to send a message of size 3 MB to a topic with default message size configuration. How does KafkaProducer handle large messages?
- A. KafkaProducer divides messages into sizes of max.request.size and sends them in order
- B. KafkaProducer divides messages into sizes of message.max.bytes and sends them in order
- C. MessageSizeTooLarge exception will be thrown, KafkaProducer will not retry and return exception immediately
- D. MessageSizeTooLarge exception will be thrown, KafkaProducer retries until the number of retries are exhausted
Answer: C
Explanation:
MessageSizeTooLarge is not a retryable exception.
NEW QUESTION 34
Which KSQL queries write to Kafka?
- A. CREATE STREAM WITH <topic> and CREATE TABLE WITH <topic>
- B. SHOW STREAMS and EXPLAIN <query> statements
- C. COUNT and JOIN
- D. CREATE STREAM AS SELECT and CREATE TABLE AS SELECT
Answer: A,D
Explanation:
SHOW STREAMS and EXPLAIN <query> statements run against the KSQL server that the KSQL client is connected to. They don't communicate directly with Kafka. CREATE STREAM WITH <topic> and CREATE TABLE WITH <topic> write metadata to the KSQL command topic. Persistent queries based on CREATE STREAM AS SELECT and CREATE TABLE AS SELECT read and write to Kafka topics. Non-persistent queries based on SELECT that are stateless only read from Kafka topics, for example SELECT * FROM foo WHERE. Non-persistent queries that are stateful read and write to Kafka, for example, COUNT and JOIN. The data in Kafka is deleted automatically when you terminate the query with CTRL-C.
NEW QUESTION 35
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. Message order not preserved
- C. Less resilient
- D. Reduce throughput
Answer: B
Explanation:
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
NEW QUESTION 36
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