Kafka Produce Response Wire Format v8

What is Produce?

Every producer sends this for every message publish, making it the dominant write path. With acks=all, the broker waits for all ISR replicas to acknowledge before responding; acks=1 returns after the leader writes locally; acks=0 is fire-and-forget with no loss detection.

Wire Diagram

Response Header

message_size int32 · 4B

correlation_id int32 · 4B

ProduceResponse v8

Responses array

ThrottleTimeMs int32 · 4B

Name string

PartitionResponses array

Index int32 · 4B

ErrorCode int16 · 2B

BaseOffset int64 · 8B

LogAppendTimeMs int64 · 8B

LogStartOffset int64 · 8B

RecordErrors array

ErrorMessage? string

BatchIndex int32 · 4B

BatchIndexErrorMessage? string

Schema & Example

Schema
{
  "Responses": [{
      "Name": string,
      "PartitionResponses": [{
          "Index": int32,
          "ErrorCode": int16,
          "BaseOffset": int64,
          "LogAppendTimeMs": int64,
          "LogStartOffset": int64,
          "RecordErrors": [{
              "BatchIndex": int32,
              "BatchIndexErrorMessage": string?
          }],
          "ErrorMessage": string?
      }]
  }],
  "ThrottleTimeMs": int32
}

Example
{
  "Responses": [{
      "Name": "orders",
      "PartitionResponses": [{
          "Index": 3,
          "ErrorCode": 0,
          "BaseOffset": 284729,
          "LogAppendTimeMs": 1711648200000,
          "LogStartOffset": 284729,
          "RecordErrors": [{
              "BatchIndex": 0,
              "BatchIndexErrorMessage": null
          }],
          "ErrorMessage": "NETWORK_EXCEPTION"
      }]
  }],
  "ThrottleTimeMs": 0
}

Kafka Produce Response Wire Format v8 — Binary Protocol Layout

What is Produce?

Wire Diagram

Schema & Example