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Kafka DescribeConfigs Request Wire Format v2 — Binary Protocol Layout

What is DescribeConfigs?

Returns broker or topic configurations via kafka-configs.sh --describe. The synonyms flag shows the full resolution chain (dynamic topic, dynamic broker, static broker, default), which helps debug why a config value isn't what you expect.

Wire Diagram

Request Header
message_size int32 · 4B
api_key int16 · 2B
api_version int16 · 2B
correlation_id int32 · 4B
client_id string
DescribeConfigsRequest v2
Resources array
IncludeSynonyms bool · 1B
ResourceType int8 · 1B
ResourceName string
ConfigurationKeys? []string

Schema & Example

Schema
{
  "Resources": [{
      "ResourceType": int8,
      "ResourceName": string,
      "ConfigurationKeys": [string]?
  }],
  "IncludeSynonyms": bool
}
Example
{
  "Resources": [{
      "ResourceType": 2,
      "ResourceName": "orders",
      "ConfigurationKeys": ["value-1", "value-2"]
  }],
  "IncludeSynonyms": true
}