Struct ShardLayout 

pub struct ShardLayout {
    pub facts: usize,
    pub entities: usize,
    pub edges: usize,
    pub temporal: usize,
    pub postings: usize,
}

Shard counts for every arena group.

Public because it is observable: it appears in Stats and in a MaintainReport, which is how a caller sees that a database re-sharded itself and what it moved to.

Fields

facts: usize

Facts and their cold sidecar.

entities: usize

Entities, the by-name index and the per-entity fact lists.

edges: usize

Both current edge mirrors and both history mirrors.

temporal: usize

The recorded_at index.

postings: usize

BM25 term handles and document lengths, plus the tag lists.

Implementations

impl ShardLayout

pub const GROWTH_MARGIN: usize = GROW_FACTOR

How far a database may drift below its ideal layout before a maintenance pass moves it.

Observable rather than internal: it is what tells a caller how much under-sharding to expect between rebuilds, and it is the figure a test needs to know how much data provokes one. Under-sharding is the cheap direction — see ShardLayout::group_earns_rebuild — so this is wide on purpose.

pub const SHRINK_MARGIN: usize = SHRINK_FACTOR

How far it may drift above before one shrinks it. Narrower, because over-sharding is the direction that costs memory.

Trait Implementations

impl Clone for ShardLayout

fn clone(&self) -> ShardLayout

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for ShardLayout

impl Debug for ShardLayout

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for ShardLayout

fn default() -> Self

The floor — what an empty database is laid out with.

impl Eq for ShardLayout

impl PartialEq for ShardLayout

fn eq(&self, other: &ShardLayout) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for ShardLayout