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Note that the tool only updates the zookeeper path and exits. The controller moves the leader for a partition to the preferred replica asynchronously.

How to use the tool?

Code Block

bin/kafka-preferred-replica-election.sh --zookeeper localhost:12913/kafka --path-to-json-file topicPartitionList.json

The tool takes a mandatory list of zookeeper hosts and an optional list of topic partitions provided as a json file. If the list is not provided, the tool queries zookeeper and gets all the topic partitions for the cluster. The tool exits after updating the zookeeper path "/admin/preferred_replica_election" with the topic partition list.

FAQ

What happens if the preferred replica is not in the ISR?
How to find if all the partitions have been moved to the "preferred replica" after running the tool?