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

Mirroring consumer group offsets within a single cluster for backup

Answer

Creating redundant copies of ZooKeeper metadata

Answer

Duplicating topics within the same Kafka cluster for A/B testing

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

The total number of brokers in the cluster

Answer

The number of brokers currently replicating data

Answer

0, because the controller is not counted as an active data broker

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

Exports consumer group offsets to a portable file format

Answer

Creates a snapshot dump of all broker configuration settings

Answer

Exports topic metadata and partition assignments to JSON

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.retention.hours

Answer

log.compaction.tombstone.retention.ms

Answer

log.cleanup.policy

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

More threads handle incoming network connections from clients

Answer

More ZooKeeper connection threads are created

Answer

More threads handle consumer group rebalancing coordination

Question 6

Which Kafka tool verifies that all replicas of each partition contain identical message data?

Accepted Answer

kafka-replica-verification.sh

Answer

kafka-verifiable-producer.sh

Answer

kafka-check-replicas.sh

Answer

kafka-fsck.sh

Question 7

What is the recommended procedure to safely decommission a Kafka broker?

Accepted Answer

Use kafka-reassign-partitions.sh to migrate all partitions off the broker before stopping it

Answer

Stop the broker process immediately and let Kafka auto-recover

Answer

Delete all topics hosted on the broker, then shut it down

Answer

Set the broker's replication factor to 0, then stop the process