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Subtask #18789

Updated by Jason Dillaman about 7 years ago

The follower instances should send a "sync start" request to the leader before starting a full image sync. If there are available sync slots available, the leader will ack the request which will allow the follower instance to proceed with the sync. The sync state should be persisted in case of leader fallover.

New InstanceWatcher RPC messages:
* Sync Request: sent from peer to leader to coordinate image sync operation
* Sync Response: sent from leader to to peer when sync is permitted to start
* Sync Start: sent from peer to leader when image sync process starts
* Sync Complete: sent from peer to leader when image sync process completes

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