CreateRevision: 1,
					ModRevision:    2,
					Value:          nil,
				},
			},
			expectedErr: "etcd event received with PrevKv=nil",
		},
		{
			name: "successful delete",
			etcdEvent: &clientv3.Event{
				Type: mvccpb.DELETE,
				PrevKv: &mvccpb.KeyValue{
					Key:            []byte("key"),
					CreateRevision: 1,
					ModRevision:    1,
					Value:          []byte("value"),
				},

		prevValue: nil,
		rev:       kv.ModRevision,
		isDeleted: false,
		isCreated: true,
	}
}

func parseEvent(e *clientv3.Event) (*event, error) {
	if !e.IsCreate() && e.PrevKv == nil {
		// If the previous value is nil, error. One example of how this is possible is if the previous value has been compacted already.

	if err != nil {
		return storage.NewInternalError(err.Error())
	}

	err = decode(s.codec, s.versioner, data, out, kv.ModRevision)
	if err != nil {
		recordDecodeError(s.groupResourceString, preparedKey)
		return err
	}
	return nil
}

// Create implements storage.Interface.Create.