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  • MetaClusterServer: listens to internal_meta_port, receives MetaGroup-related Raft requests, and forwards them to MetaMember. It also starts the underlying IoTDB once it is up.
  • MetaHeartbeatServer: listens to internal_meta_port + 1, receives MetaGroup heartbeats, and forwards them to MetaMember.
  • DataClusterServer: listens to internal_data_port, receives DataGroup-related Raft requests, decides which DataMember will process it and forwards to it.
  • DataHeartbeatServer: listens to internal_data_port + 1, only receives DataGroup heartbeats, decides which DataMember will process it and forwards to it.
  • ClientClusterServer: listens to external_client_port, receives database operations from clients, and forwards them to MetaMember.

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