Apache Kafka Kafka Admin & Operations 3

Question 1

What is Kafka MirrorMaker 2 primarily used for?

Accepted Answer

Replicating data between separate Kafka clusters across data centers or regions

Answer

MirrorMaker 2 is a multi-cluster replication tool built on Kafka Connect that replicates topics, offsets, and ACLs between geographically distributed Kafka clusters.

Question 2

What does Active Controller Count equal in a healthy Kafka cluster?

Accepted Answer

Exactly 1, since only one broker can be the controller at a time

Answer

In a healthy cluster, ActiveControllerCount must always be exactly 1; a value of 0 means no controller is elected, and >1 indicates a split-brain condition.

Question 3

What does the `kafka-dump-log.sh` tool do?

Accepted Answer

Prints the raw contents of Kafka log segment files for low-level debugging

Answer

kafka-dump-log.sh reads and displays individual messages and their metadata from Kafka's on-disk log segment files, useful for debugging data issues.

Question 4

Which configuration controls how long tombstone (null-value) messages are retained in a log-compacted Kafka topic?

Accepted Answer

log.cleaner.delete.retention.ms

Answer

log.cleaner.delete.retention.ms specifies how long tombstone records are preserved in a compacted topic before the log cleaner permanently removes them.

Question 5

What is the effect of increasing `num.io.threads` in the Kafka broker configuration?

Accepted Answer

More threads are allocated for disk I/O read and write operations

Answer

num.io.threads controls threads dedicated to disk I/O; increasing it improves throughput on I/O-bound brokers with many concurrent partition reads and writes.

Apache Kafka Practice Test

Apache Kafka Practice Test

Apache Kafka Kafka Admin & Operations 3