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Comment: Fix incorrect thread name

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The existing AlterReplicaLogDirs RPC is sent directly to the broker in question, which starts moving the replicas using a AlterReplicaLogDirs threads – ReplicaAlterLogDirsThread – this remains unchanged. But when the future replica first catches up with the main replica, instead of immediately promoting the future replica, the broker will:

  1. Asynchronously communicate the log directory change to the controller using the new RPC – AssignReplicasToDirs.
  2. Keep the AlterReplicaLogDirs thread going ReplicaAlterLogDirsThread going. The future replica is still the future replica, and it continues to copy from the main replica – which still in the original log directory – as new records are appended.

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