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  1. Control Plane is a channel outside the job that allows taking control actions by multiple controllers like Samza Dashboard, Startpoints controller. 
  2. ContainerPlacementHandler is a stateless handler registered to control plane that dispatches placement actions to invoke Container Placement Service APIs


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This control plane can be implemented in the following ways 

Option 1: Samza metastore serviceMetastore API [Preferred]

Samza Metastore will provide Metastore provides an API to write to the coordinator stream. One simple way to expose Container Placement API is, Container Placement handler can have a coordinator stream consumer polling control messages from coordinator stream & acting on them.

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