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Kafka AssignReplicasToDirs Response Wire Format v0 — Binary Protocol Layout

What is AssignReplicasToDirs?

The KRaft controller assigns partition replicas to specific log directories on a broker, for multi-disk and tiered storage configurations. When a new log directory is added, replicas can be redistributed across directories through this API rather than needing a full cross-broker reassignment.

Wire Diagram

Response Header · flexible
message_size int32 · 4B
correlation_id int32 · 4B
tagged var
AssignReplicasToDirsResponse v0
ThrottleTimeMs int32 · 4B
ErrorCode int16 · 2B
Directories array
tagged var
Id uuid · 16B
Topics array
tagged var
TopicId uuid · 16B
Partitions array
tagged var
PartitionIndex int32 · 4B
ErrorCode int16 · 2B
tagged var

Schema & Example

Schema
{
  "ThrottleTimeMs": int32,
  "ErrorCode": int16,
  "Directories": [{
      "Id": uuid,
      "Topics": [{
          "TopicId": uuid,
          "Partitions": [{
              "PartitionIndex": int32,
              "ErrorCode": int16
          }]
      }]
  }]
}
Example
{
  "ThrottleTimeMs": 0,
  "ErrorCode": 0,
  "Directories": [{
      "Id": "550e8400-e29b-41d4-a716-446655440000",
      "Topics": [{
          "TopicId": "550e8400-e29b-41d4-a716-446655440000",
          "Partitions": [{
              "PartitionIndex": 3,
              "ErrorCode": 0
          }]
      }]
  }]
}