Kafka ElectLeaders Request Wire Format v2 — Binary Protocol Layout

What is ElectLeaders?

Forces preferred leader elections or triggers unclean elections via kafka-leader-election.sh. Preferred election safely moves leadership back to the first replica; unclean election (type=1) risks data loss by electing an out-of-sync replica when no in-sync replica is available.

Schema
{
  "ElectionType": int8,
  "TopicPartitions": [{
      "Topic": string,
      "Partitions": [int32]
  }]?,
  "TimeoutMs": int32
}

Example
{
  "ElectionType": 1,
  "TopicPartitions": [{
      "Topic": "orders",
      "Partitions": [1, 2, 3]
  }]?,
  "TimeoutMs": 30000
}