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+# Design for VolumeSnapshotter v2 API
+
+## Abstract
+This design includes the changes to the VolumeSnapshotter api design as required by the [Item Action Progress Monitoring](general-progress-monitoring.md) feature.
+The VolumeSnapshotter v2 interface will have two new methods.
+If there are any additional VolumeSnapshotter API changes that are needed in the same Velero release cycle as this change, those can be added here as well.
+
+## Background
+This API change is needed to facilitate long-running plugin actions that may not be complete when the Execute() method returns.
+The existing snapshotID returned by CreateSnapshot will be used as the operation ID.
+This will allow long-running plugin actions to continue in the background while Velero moves on to the next plugin, the next item, etc.
+
+## Goals
+- Allow for VolumeSnapshotter CreateSnapshot() to initiate a long-running operation and report on operation status.
+
+## Non Goals
+- Allowing velero control over when the long-running operation begins.
+
+
+## High-Level Design
+As per the [Plugin Versioning](plugin-versioning.md) design, a new VolumeSnapshotterv2 plugin `.proto` file will be created to define the GRPC interface.
+v2 go files will also be created in `plugin/clientmgmt/volumesnapshotter` and `plugin/framework/volumesnapshotter`, and a new PluginKind will be created.
+The velero Backup process will be modified to reference v2 plugins instead of v1 plugins.
+An adapter will be created so that any existing VolumeSnapshotter v1 plugin can be executed as a v2 plugin when executing a backup.
+
+## Detailed Design
+
+### proto changes (compiled into golang by protoc)
+
+The v2 VolumeSnapshotter.proto will be like the current v1 version with the following changes:
+The VolumeSnapshotter service gets two new rpc methods:
+```
+service VolumeSnapshotter {
+    rpc Init(VolumeSnapshotterInitRequest) returns (Empty);
+    rpc CreateVolumeFromSnapshot(CreateVolumeRequest) returns (CreateVolumeResponse);
+    rpc GetVolumeInfo(GetVolumeInfoRequest) returns (GetVolumeInfoResponse);
+    rpc CreateSnapshot(CreateSnapshotRequest) returns (CreateSnapshotResponse);
+    rpc DeleteSnapshot(DeleteSnapshotRequest) returns (Empty);
+    rpc GetVolumeID(GetVolumeIDRequest) returns (GetVolumeIDResponse);
+    rpc SetVolumeID(SetVolumeIDRequest) returns (SetVolumeIDResponse);
+    rpc Progress(VolumeSnapshotterProgressRequest) returns (VolumeSnapshotterProgressResponse);
+    rpc Cancel(VolumeSnapshotterCancelRequest) returns (google.protobuf.Empty);
+}
+```
+To support these new rpc methods, we define new request/response message types:
+```
+message VolumeSnapshotterProgressRequest {
+    string plugin = 1;
+    string snapshotID = 2;
+}
+
+message VolumeSnapshotterProgressResponse {
+    generated.OperationProgress progress = 1;
+}
+
+message VolumeSnapshotterCancelRequest {
+    string plugin = 1;
+    string operationID = 2;
+}
+
+```
+One new shared message type will be needed, as defined in the v2 BackupItemAction design:
+```
+message OperationProgress {
+    bool completed = 1;
+    string err = 2;
+    int64 completed = 3;
+    int64 total = 4;
+    string operationUnits = 5;
+    string description = 6;
+    google.protobuf.Timestamp started = 7;
+    google.protobuf.Timestamp updated = 8;
+}
+```
+
+A new PluginKind, `VolumeSnapshotterV2`, will be created, and the backup process will be modified to use this plugin kind.
+See [Plugin Versioning](plugin-versioning.md) for more details on implementation plans, including v1 adapters, etc.
+
+
+## Compatibility
+The included v1 adapter will allow any existing VolumeSnapshotter plugin to work as expected, with no-op Progress() and Cancel() methods.
+
+## Implementation
+This will be implemented during the Velero 1.11 development cycle.