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Kafka AlterPartitionReassignments Response Wire Format v1 — Binary Protocol Layout

What is AlterPartitionReassignments?

Moves partition replicas between brokers via kafka-reassign-partitions.sh --execute, for rebalancing or decommissioning. Passing null as the target replica list cancels an in-progress reassignment; reassignments respect throttle.replication.rate.limit to avoid saturating broker network.

Related Errors

NO_REASSIGNMENT_IN_PROGRESS · REASSIGNMENT_IN_PROGRESS

Wire Diagram

Response Header · flexible
message_size int32 · 4B
correlation_id int32 · 4B
tagged var
AlterPartitionReassignmentsResponse v1
ThrottleTimeMs int32 · 4B
AllowReplicationFactorChange bool · 1B
ErrorCode int16 · 2B
ErrorMessage? string (compact)
Responses array
tagged var
Name string (compact)
Partitions array
tagged var
PartitionIndex int32 · 4B
ErrorCode int16 · 2B
ErrorMessage? string (compact)
tagged var

Schema & Example

Schema
{
  "ThrottleTimeMs": int32,
  "AllowReplicationFactorChange": bool,
  "ErrorCode": int16,
  "ErrorMessage": string?,
  "Responses": [{
      "Name": string,
      "Partitions": [{
          "PartitionIndex": int32,
          "ErrorCode": int16,
          "ErrorMessage": string?
      }]
  }]
}
Example
{
  "ThrottleTimeMs": 0,
  "AllowReplicationFactorChange": true,
  "ErrorCode": 0,
  "ErrorMessage": "NETWORK_EXCEPTION",
  "Responses": [{
      "Name": "orders",
      "Partitions": [{
          "PartitionIndex": 3,
          "ErrorCode": 0,
          "ErrorMessage": null
      }]
  }]
}