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spec: ListVolumes, ListSnapshots consistency. #297

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Nov 8, 2018
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spec: ListVolumes, ListSnapshots consistency. #297

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4 changes: 4 additions & 0 deletions spec.md
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Expand Up @@ -1225,6 +1225,8 @@ The CO MUST implement the specified error recovery behavior when it encounters t

A Controller Plugin MUST implement this RPC call if it has `LIST_VOLUMES` capability.
The Plugin SHALL return the information about all the volumes that it knows about.
If volumes are created and/or deleted while the CO is concurrently paging through `ListVolumes` results then it is possible that the CO MAY either witness duplicate volumes in the list, not witness existing volumes, or both.
The CO SHALL NOT expect a consistent "view" of all volumes when paging through the volume list via multiple calls to `ListVolumes`.

```protobuf
message ListVolumesRequest {
Expand Down Expand Up @@ -1538,6 +1540,8 @@ The CO MUST implement the specified error recovery behavior when it encounters t
A Controller Plugin MUST implement this RPC call if it has `LIST_SNAPSHOTS` capability.
The Plugin SHALL return the information about all snapshots on the storage system within the given parameters regardless of how they were created.
`ListSnapshots` SHALL NOT list a snapshot that is being created but has not been cut successfully yet.
If snapshots are created and/or deleted while the CO is concurrently paging through `ListSnapshots` results then it is possible that the CO MAY either witness duplicate snapshots in the list, not witness existing snapshots, or both.
The CO SHALL NOT expect a consistent "view" of all snapshots when paging through the snapshot list via multiple calls to `ListSnapshots`.

```protobuf
// List all snapshots on the storage system regardless of how they were
Expand Down