THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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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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