THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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The currently active controller will monitor the offset of the latest snapshot made by all replicas, including itself. The snapshotting state of each node is considered soft state: it is not persisted anywhere in the log, but purely communicated by heartbeats and stored in memory by the active controller.
When the active controller decides that a standby controller should start a snapshot, it will communicate that information in its response to the periodic heartbeat sent by that node. Each snapshot will be of a consistent point in time. Because the snapshots are centrally coordinated by the active controller, we can avoid initiating more than one snapshot at once.
Broker Registration and State Management
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As always with enums, the UNKNOWN state is used only to translate values that our software is too old to understand.
The controller will return NOT_CONTROLLER if it is not active. Brokers will always return NOT_CONTROLLER for these RPCs.
ControllerHeartbeat
The controllers periodically send out a heartbeat request to the active controller.
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The controller will return NOT_CONTROLLER if it is not active. Brokers will always return NOT_CONTROLLER for these RPCs.
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