DescribeProducers
This page encodes the smallest legal instance of the request and the response: numeric fields are zero, strings and byte arrays are empty, every array carries exactly one sample element, and any records field holds one empty 61-byte RecordBatch v2. Version 0 is a flexible version, so every struct is terminated by a uvarint tagged-field count and strings and arrays carry compact length-plus-one prefixes. Sizes below include the leading int32 size prefix.
- API key
- 61
- Encoded at
- v0
- Flexible versions
- 0+
- Headers
- req v2, resp v1
- Request versions
- 0
- Response versions
- 0
- Request size
- 24 bytes
- Response size
- 64 bytes
framerpc headerrequest bodyRecordBatchRecordresponse bodytagged_fields
Request
DescribeProducersRequest v0, request header v2, 24 bytes on the wire
byte layout (24 bytes, 16 bytes per row)
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object tree
DescribeProducersRequest message v0 [0x0000, 24B] +-- Frame [0x0000, 4B] length-delimited framing | +-- size int32 = 20 [0x0000, 4B] number of bytes that follow, patched after encoding +-- RequestHeader v2 [0x0004, 11B] common request header | +-- request_api_key int16 = 61 (DescribeProducers) [0x0004, 2B] numeric id of the API being invoked | +-- request_api_version int16 = 0 [0x0006, 2B] version of the API being invoked | +-- correlation_id int32 = 0 [0x0008, 4B] echoed back by the broker in the response | +-- client_id nullable_string = "" (int16 len=0) [0x000c, 2B] always a non-flexible int16-prefixed string | +-- tagged_fields uvarint = 0 [0x000e, 1B] number of tagged fields in the header +-- DescribeProducersRequest struct [0x000f, 9B] message body, version 0 +-- Topics []TopicRequest = 1 element [0x000f, 8B] The topics to list producers for. | +-- length uvarint = 2 (compact, n+1) [0x000f, 1B] one sample element follows | +-- TopicRequest[0] TopicRequest = struct [0x0010, 7B] | +-- Name string = "" (compact, len+1=1) [0x0010, 1B] The topic name. | +-- PartitionIndexes []int32 = 1 element [0x0011, 5B] The indexes of the partitions to list producers for. | | +-- length uvarint = 2 (compact, n+1) [0x0011, 1B] one sample element follows | | +-- int32[0] int32 = 0 [0x0012, 4B] | +-- tagged_fields uvarint = 0 [0x0016, 1B] number of tagged fields in this struct +-- tagged_fields uvarint = 0 [0x0017, 1B] number of tagged fields in this struct
kafka message schema (.json)
{ "apiKey": 61, "type": "request", "listeners": ["broker"], "name": "DescribeProducersRequest", "validVersions": "0", "flexibleVersions": "0+", "fields": [ { "name": "Topics", "type": "[]TopicRequest", "versions": "0+", "about": "The topics to list producers for.", "fields": [ { "name": "Name", "type": "string", "versions": "0+", "entityType": "topicName", "about": "The topic name." }, { "name": "PartitionIndexes", "type": "[]int32", "versions": "0+", "about": "The indexes of the partitions to list producers for." } ]} ] }
Response
DescribeProducersResponse v0, response header v1, 64 bytes on the wire
byte layout (64 bytes, 16 bytes per row)
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object tree
DescribeProducersResponse message v0 [0x0000, 64B] +-- Frame [0x0000, 4B] length-delimited framing | +-- size int32 = 60 [0x0000, 4B] number of bytes that follow, patched after encoding +-- ResponseHeader v1 [0x0004, 5B] common response header | +-- correlation_id int32 = 0 [0x0004, 4B] matches the correlation_id of the request | +-- tagged_fields uvarint = 0 [0x0008, 1B] number of tagged fields in the header +-- DescribeProducersResponse struct [0x0009, 55B] message body, version 0 +-- ThrottleTimeMs int32 = 0 [0x0009, 4B] The duration in milliseconds for which the request was throttled due to a q... +-- Topics []TopicResponse = 1 element [0x000d, 50B] Each topic in the response. | +-- length uvarint = 2 (compact, n+1) [0x000d, 1B] one sample element follows | +-- TopicResponse[0] TopicResponse = struct [0x000e, 49B] | +-- Name string = "" (compact, len+1=1) [0x000e, 1B] The topic name. | +-- Partitions []PartitionResponse = 1 element [0x000f, 47B] Each partition in the response. | | +-- length uvarint = 2 (compact, n+1) [0x000f, 1B] one sample element follows | | +-- PartitionResponse[0] PartitionResponse = struct [0x0010, 46B] | | +-- PartitionIndex int32 = 0 [0x0010, 4B] The partition index. | | +-- ErrorCode int16 = 0 [0x0014, 2B] The partition error code, or 0 if there was no error. | | +-- ErrorMessage string = "" (compact, len+1=1) [0x0016, 1B] The partition error message, which may be null if no additional details are... | | +-- ActiveProducers []ProducerState = 1 element [0x0017, 38B] The active producers for the partition. | | | +-- length uvarint = 2 (compact, n+1) [0x0017, 1B] one sample element follows | | | +-- ProducerState[0] ProducerState = struct [0x0018, 37B] | | | +-- ProducerId int64 = 0 [0x0018, 8B] The producer id. | | | +-- ProducerEpoch int32 = 0 [0x0020, 4B] The producer epoch. | | | +-- LastSequence int32 = 0 [0x0024, 4B] The last sequence number sent by the producer. | | | +-- LastTimestamp int64 = 0 [0x0028, 8B] The last timestamp sent by the producer. | | | +-- CoordinatorEpoch int32 = 0 [0x0030, 4B] The current epoch of the producer group. | | | +-- CurrentTxnStartOffset int64 = 0 [0x0034, 8B] The current transaction start offset of the producer. | | | +-- tagged_fields uvarint = 0 [0x003c, 1B] number of tagged fields in this struct | | +-- tagged_fields uvarint = 0 [0x003d, 1B] number of tagged fields in this struct | +-- tagged_fields uvarint = 0 [0x003e, 1B] number of tagged fields in this struct +-- tagged_fields uvarint = 0 [0x003f, 1B] number of tagged fields in this struct
kafka message schema (.json)
{ "apiKey": 61, "type": "response", "name": "DescribeProducersResponse", "validVersions": "0", "flexibleVersions": "0+", "fields": [ { "name": "ThrottleTimeMs", "type": "int32", "versions": "0+", "about": "The duration in milliseconds for which the request was throttled due to a quota violation, or zero if the request did not violate any quota." }, { "name": "Topics", "type": "[]TopicResponse", "versions": "0+", "about": "Each topic in the response.", "fields": [ { "name": "Name", "type": "string", "versions": "0+", "entityType": "topicName", "about": "The topic name." }, { "name": "Partitions", "type": "[]PartitionResponse", "versions": "0+", "about": "Each partition in the response.", "fields": [ { "name": "PartitionIndex", "type": "int32", "versions": "0+", "about": "The partition index." }, { "name": "ErrorCode", "type": "int16", "versions": "0+", "about": "The partition error code, or 0 if there was no error." }, { "name": "ErrorMessage", "type": "string", "versions": "0+", "nullableVersions": "0+", "default": "null", "about": "The partition error message, which may be null if no additional details are available." }, { "name": "ActiveProducers", "type": "[]ProducerState", "versions": "0+", "about": "The active producers for the partition.", "fields": [ { "name": "ProducerId", "type": "int64", "versions": "0+", "entityType": "producerId", "about": "The producer id."}, { "name": "ProducerEpoch", "type": "int32", "versions": "0+", "about": "The producer epoch."}, { "name": "LastSequence", "type": "int32", "versions": "0+", "default": "-1", "about": "The last sequence number sent by the producer."}, { "name": "LastTimestamp", "type": "int64", "versions": "0+", "default": "-1", "about": "The last timestamp sent by the producer."}, { "name": "CoordinatorEpoch", "type": "int32", "versions": "0+", "about": "The current epoch of the producer group."}, { "name": "CurrentTxnStartOffset", "type": "int64", "versions": "0+", "default": "-1", "about": "The current transaction start offset of the producer."} ]} ]} ]} ] }