Kafka InitProducerId Request Wire Format v0 — Binary Protocol Layout

What is InitProducerId?

Every idempotent or transactional producer calls this before sending records to obtain a producer ID and epoch. The epoch prevents zombie producers: a restarted instance bumps the epoch, and late-arriving writes from the old instance are rejected with INVALID_PRODUCER_EPOCH.

Schema
{
  "TransactionalId": string?,
  "TransactionTimeoutMs": int32
}

Example
{
  "TransactionalId": "tx-orders-001",
  "TransactionTimeoutMs": 5000
}