Module vnode 

VnodeRegistry — runtime-configurable virtual node topology.

Replaces the compile-time VNODE_COUNT constant that previously lived in laminar-storage. A registry owns:

• the current vnode count (configurable; 256 by default),
• the node-per-vnode assignment (for distributed modes),
• a monotonically increasing assignment_version used by ObjectStoreBackend to fence out stale writers.

Vnode assignment is derived from the row’s primary key via key_hash (xxh3) and modulo vnode_count. Connectors that need a vnode ID for an event call VnodeRegistry::vnode_for_key.

Structs

ArchivedNodeId

An archived NodeId

NodeId

Unique identifier for a node. Also the owner id for vnodes; cluster membership and vnode ownership identify the same thing.

NodeIdResolver

The resolver for an archived NodeId

VnodeRegistry

Runtime registry of vnode topology and assignment.

Functions

key_hash

Hash a key to a 64-bit value. Used to derive vnode IDs and for any other keyed-partitioning decisions.

owned_vnodes

Vnodes currently assigned to owner.

round_robin_assignment

Build a vnode-to-owner assignment by round-robin across sorted peers.