Kafka FindCoordinator Response Wire Format v0 — Binary Protocol Layout

What is FindCoordinator?

The first step before any group or transaction operation: locates the group coordinator or transaction coordinator. A COORDINATOR_NOT_AVAILABLE response means the __consumer_offsets or __transaction_state partition leader is still being elected; retry with backoff.

Schema
{
  "ErrorCode": int16,
  "NodeId": int32,
  "Host": string,
  "Port": int32
}

Example
{
  "ErrorCode": 0,
  "NodeId": 1,
  "Host": "broker-1.kafka.local",
  "Port": 9092
}