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PartitionRecord and PartitionChangeRecord will both have a new Assignment field which will replace replaces the current Repicas Replicas field:

{ "name": "Replicas", "type":  "[]int32", "versions":  "0", "entityType": "brokerId",
  "about": "The replicas of this partition, sorted by preferred order." },
(...)
{ "name": "Assignment", "type": "[]ReplicaAssignment", "versions": "1+",
  "about": "The replicas of this partition, sorted by preferred order.", "fields": [
  { "name": "Broker", "type": "int32", "versions": "1+", "entityType": "brokerId",
    "about": "The broker ID hosting the replica." },
  { "name": "Directory", "type": "uuid", "versions": "1+",
    "about": "The log directory hosting the replica" }
]}

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