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Intermediate Functionality:

1. A client sends an admin request write requests to the controller broker. Read requests can still go to any broker. 
   1. As a follow up request forwarding can be added transparently. (see below)
2. The request is handled and the server blocks until a timeout is reached or the requested operation is completed (failure or success)
   1. An operation is considered complete/successful when the controller node has the correct/current state.
   2. Immediate follow up requests to the controller will succeed. Others (not to the controller) are likely to succeed or cause a retriable exception that would eventually succeed. 
   3. Requests that timeout may still be completed after the timeout. The users would need to poll to check the state. 
3. A response is sent back to the client. 

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