Module snapshot 

Durable vnode→instance assignment snapshots. One object per version at control/assignment-snapshots/v{N:020}.json. Chitchat carries the ephemeral copy; these files survive full-cluster restart.

Rotation and drain finalization use PutMode::Create on separate per-version paths. The append-only winner works on every backend, including LocalFileSystem, without relying on conditional overwrite support.

Structs

AssignmentSnapshot

Durable vnode-to-instance assignment snapshot.

AssignmentSnapshotRef

Exact immutable reference to a staged failure-recovery successor.

AssignmentSnapshotStore

I/O wrapper for AssignmentSnapshot on an object store.

Enums

RotateOutcome

Outcome of AssignmentSnapshotStore::save_if_version.

SnapshotError

Errors loading or saving an AssignmentSnapshot.