How will you find out all the partitions where one or more of the replicas for the partition are not in- sync with the leader?

Question

Options

• Akafka-topics.sh --bootstrap-server localhost:9092 --describe --unavailable- partitions
• Bkafka-topics.sh --zookeeper localhost:2181 --describe --unavailable- partitions
• Ckafka-topics.sh --broker-list localhost:9092 --describe --under-replicated-partitions
• Dkafka-topics.sh --zookeeper localhost:2181 --describe --under-replicated-partitions

• A
  4% (2)
• B
  2% (1)
• C
  8% (4)
• D
  87% (45)

Explanation

Option D is correct because --under-replicated-partitions is the precise flag that lists partitions where one or more replicas are lagging behind the leader, and --zookeeper localhost:2181 was the standard connection method for the Kafka version this exam targets.

Why the distractors are wrong:

• A & B use --unavailable-partitions, which finds partitions with no leader at all (completely offline) - a different problem from replicas simply being out of sync with an active leader.
• C uses --broker-list, which is not a valid flag for kafka-topics.sh (that flag belongs to tools like kafka-console-producer.sh); the correct connection flags are --zookeeper or --bootstrap-server.
• A also pairs --bootstrap-server with the wrong flag, making it doubly wrong.

Memory tip: Think "under-replicated = replicas falling behind" vs "unavailable = no leader exists" - these are two distinct failure states. For older Kafka exam questions, Zookeeper (2181) connects the admin tools, while brokers (9092) handle client data.

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