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OwnedShardFraction

aion_server::worker::backpressure

Struct OwnedShardFraction 

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pub struct OwnedShardFraction { /* private fields */ }
Expand description

This node’s owned-shard fraction of the cluster’s virtual shard space.

owned / total is the proportional slice of every tenant’s cluster-wide quota this node enforces (CP-Phase-2 §3.6). A single-node / own-all deployment has owned == total (fraction 1), so each per-node ceiling equals the full quota and behaviour is byte-identical to no per-node split.

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impl OwnedShardFraction

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pub fn new(owned: u32, total: u32) -> Self

Build a fraction from this node’s owned-shard count and the cluster shard count.

A total of zero is meaningless (the keyspace always has ≥1 shard); it is clamped to 1 so the fraction is well-defined. owned is clamped to total — a node never owns more than the whole keyspace — so the fraction is always in (0, 1] and a per-node ceiling never exceeds the cluster-wide quota.

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pub fn own_all() -> Self

The whole cluster on one node (own-all): fraction 1, so a per-node ceiling equals the full cluster-wide quota. This is the single-node default and the byte-identical path.

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pub fn per_node_ceiling(self, quota: u32) -> u32

ceil(quota × owned / total) — this node’s proportional slice of the cluster-wide quota, rounded UP so the per-node ceilings sum to ≥ quota (over-admit slightly under shard skew rather than starve — the right failure direction with generous defaults, CP-Phase-2 §3.6).

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impl Clone for OwnedShardFraction

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fn clone(&self) -> OwnedShardFraction

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

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

Performs copy-assignment from source. Read more
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impl Copy for OwnedShardFraction

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impl Debug for OwnedShardFraction

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

Formats the value using the given formatter. Read more
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impl Eq for OwnedShardFraction

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impl PartialEq for OwnedShardFraction

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

Equality operator ==. Read more
1.0.0 (const: unstable) · Source§

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

Inequality operator !=. Read more
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impl StructuralPartialEq for OwnedShardFraction

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