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Kafka DescribeProducers Response Wire Format v0 — Binary Protocol Layout

What is DescribeProducers?

Shows active producer sessions on a partition via kafka-transactions.sh --describe-producers, including producer ID, epoch, and last sequence number. Helps diagnose zombie producers (old producer ID still active) or duplicate sequence errors.

Related Errors

TOPIC_AUTHORIZATION_FAILED · UNKNOWN_TOPIC_OR_PARTITION

Wire Diagram

Response Header · flexible
message_size int32 · 4B
correlation_id int32 · 4B
tagged var
DescribeProducersResponse v0
ThrottleTimeMs int32 · 4B
Topics array
tagged var
Name string (compact)
Partitions array
tagged var
PartitionIndex int32 · 4B
ErrorCode int16 · 2B
ErrorMessage? string (compact)
ActiveProducers array
tagged var
ProducerId int64 · 8B
ProducerEpoch int32 · 4B
LastSequence int32 · 4B
LastTimestamp int64 · 8B
CoordinatorEpoch int32 · 4B
CurrentTxnStartOffset int64 · 8B
tagged var

Schema & Example

Schema
{
  "ThrottleTimeMs": int32,
  "Topics": [{
      "Name": string,
      "Partitions": [{
          "PartitionIndex": int32,
          "ErrorCode": int16,
          "ErrorMessage": string?,
          "ActiveProducers": [{
              "ProducerId": int64,
              "ProducerEpoch": int32,
              "LastSequence": int32,
              "LastTimestamp": int64,
              "CoordinatorEpoch": int32,
              "CurrentTxnStartOffset": int64
          }]
      }]
  }]
}
Example
{
  "ThrottleTimeMs": 0,
  "Topics": [{
      "Name": "orders",
      "Partitions": [{
          "PartitionIndex": 3,
          "ErrorCode": 0,
          "ErrorMessage": null,
          "ActiveProducers": [{
              "ProducerId": 0,
              "ProducerEpoch": 12,
              "LastSequence": 0,
              "LastTimestamp": 0,
              "CoordinatorEpoch": 12,
              "CurrentTxnStartOffset": 150382
          }]
      }]
  }]
}