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update spec doc for groupcontroller service
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‎spec.md‎

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@@ -80,85 +80,97 @@ A CO SHOULD be equipped to handle both centralized and headless plugins, as well
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Several of these possibilities are illustrated in the following figures.
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```
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CO "Master" Host
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+-------------------------------------------+
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| |
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| +------------+ +------------+ |
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| | CO | gRPC | Controller | |
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| | +-----------> Plugin | |
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| +------------+ +------------+ |
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| |
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+-------------------------------------------+
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CO "Node" Host(s)
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+-------------------------------------------+
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| |
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| +------------+ +------------+ |
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| | CO | gRPC | Node | |
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| | +-----------> Plugin | |
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| +------------+ +------------+ |
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| |
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+-------------------------------------------+
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CO "Master" Host
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+-------------------------------------------------+
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| |
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| +------------+ +------------------+ |
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| | CO | gRPC | Controller | |
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| | +--+--------> Plugin | |
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| +------------+ | +------------------+ |
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| | |
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| | +------------------+ |
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| | | Group Controller | |
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| +--------> Plugin | |
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| +------------------+ |
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| |
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+-------------------------------------------------+
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CO "Node" Host(s)
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+-------------------------------------------------+
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| |
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| +------------+ +------------------+ |
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| | CO | gRPC | Node | |
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| | +-----------> Plugin | |
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| +------------+ +------------------+ |
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| |
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+-------------------------------------------------+
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Figure 1: The Plugin runs on all nodes in the cluster: a centralized
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Controller Plugin is available on the CO master host and the Node
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Plugin is available on all of the CO Nodes.
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Controller Plugin and Group Controller Plugin (Optional) are available
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on the CO master host and the Node Plugin is available on all of the
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CO Nodes.
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```
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```
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CO "Node" Host(s)
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+-------------------------------------------+
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| |
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| +------------+ +------------+ |
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| | CO | gRPC | Controller | |
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| | +--+--------> Plugin | |
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| +------------+ | +------------+ |
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| | |
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| | |
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| | +------------+ |
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| | | Node | |
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| +--------> Plugin | |
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| +------------+ |
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| |
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+-------------------------------------------+
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CO "Node" Host(s)
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+-------------------------------------------------+
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| |
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| +------------------+ |
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| | Node | |
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| +--------> Plugin | |
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| | +------------------+ |
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| | |
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| +------------+ | +------------------+ |
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| | CO | |gRPC | Controller | |
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| | +-----------> Plugin | |
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| +------------+ | +------------------+ |
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| | |
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| | +------------------+ |
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| | | Group Controller | |
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| +--------> Plugin | |
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| +------------------+ |
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| |
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+-------------------------------------------------+
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Figure 2: Headless Plugin deployment, only the CO Node hosts run
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Plugins. Separate, split-component Plugins supply the Controller
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Service and the Node Service respectively.
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Plugins. Separate, split-component Plugins supply the Node Service,
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the Controller Service and the Group Controller Service (Optional)
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respectively.
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```
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```
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CO "Node" Host(s)
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+-------------------------------------------+
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| |
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| +------------+ +------------+ |
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| | CO | gRPC | Controller | |
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| | +-----------> Node | |
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| +------------+ | Plugin | |
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| +------------+ |
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| |
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+-------------------------------------------+
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CO "Node" Host(s)
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+-------------------------------------------------+
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| |
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| +------------------+ |
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| +------------+ | Node | |
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| | CO | gRPC | Controller | |
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| | +-----------> Group Controller | |
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| +------------+ | Plugin | |
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| +------------------+ |
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| |
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+-------------------------------------------------+
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Figure 3: Headless Plugin deployment, only the CO Node hosts run
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Plugins. A unified Plugin component supplies both the Controller
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Service and Node Service.
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Plugins. A unified Plugin component supplies both the Node Service,
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the Controller Service and the Group Controller Service (Optional).
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```
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```
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CO "Node" Host(s)
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+-------------------------------------------+
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| |
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| +------------+ +------------+ |
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| | CO | gRPC | Node | |
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| | +-----------> Plugin | |
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| +------------+ +------------+ |
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| |
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+-------------------------------------------+
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CO "Node" Host(s)
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+-------------------------------------------------+
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| |
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| +------------+ +------------------+ |
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| | CO | gRPC | Node | |
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| | +-----------> Plugin | |
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| +------------+ +------------------+ |
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| |
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+-------------------------------------------------+
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Figure 4: Headless Plugin deployment, only the CO Node hosts run
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Plugins. A Node-only Plugin component supplies only the Node Service.
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Its GetPluginCapabilities RPC does not report the CONTROLLER_SERVICE
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capability.
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Its GetPluginCapabilities RPC does not report both the CONTROLLER_SERVICE
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capability and the GROUP_CONTROLLER_SERVICE capability.
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```
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### Volume Lifecycle
@@ -268,7 +280,13 @@ Each SP MUST provide:
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* **Node Plugin**: A gRPC endpoint serving CSI RPCs that MUST be run on the Node whereupon an SP-provisioned volume will be published.
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* **Controller Plugin**: A gRPC endpoint serving CSI RPCs that MAY be run anywhere.
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* In some circumstances a single gRPC endpoint MAY serve all CSI RPCs (see Figure 3 in [Architecture](#architecture)).
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Each SP MAY provide:
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- **Group Controller Plugin**: A gRPC endpoint serving CSI RPCs that MAY be run anywhere.
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In some circumstances a single gRPC endpoint MAY serve all CSI RPCs (see Figure 3 in [Architecture](#architecture)).
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```protobuf
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syntax = "proto3";
@@ -322,10 +340,11 @@ extend google.protobuf.ServiceOptions {
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}
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```
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There are three sets of RPCs:
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There are four sets of RPCs:
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* **Identity Service**: Both the Node Plugin and the Controller Plugin MUST implement this sets of RPCs.
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* **Identity Service**: Both the Controller Plugin, the Group Controller Plugin and the Node Plugin MUST implement this sets of RPCs.
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* **Controller Service**: The Controller Plugin MUST implement this sets of RPCs.
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* **Group Controller Service**: The GroupController Plugin MUST implement this sets of RPCs.
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* **Node Service**: The Node Plugin MUST implement this sets of RPCs.
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```protobuf

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