Struct EpochEvidence 

pub struct EpochEvidence {
    pub epoch: u64,
    pub views_processed: usize,
    pub views_recomputed: usize,
    pub total_delta_size: usize,
    pub total_materialized_size: usize,
    pub duration_us: u64,
    pub per_view: Vec<PropagationResult>,
}

Evidence record for a single IVM propagation epoch.

Serialized to JSONL for offline analysis of delta efficiency vs full recompute. Consumed by the evidence sink and SLO breach detection.

Fields

epoch: u64

Monotonic epoch counter.

views_processed: usize

Number of views that received deltas.

views_recomputed: usize

Number of views that fell back to full recompute.

total_delta_size: usize

Sum of delta entry counts across all views.

total_materialized_size: usize

Sum of materialized view sizes (baseline cost).

duration_us: u64

Wall-clock time for the entire propagation (microseconds).

per_view: Vec<PropagationResult>

Per-view results.

Implementations

impl EpochEvidence

pub fn delta_ratio(&self) -> f64

The delta-to-full ratio. Values < 1.0 mean IVM is winning.

Ratio = total_delta_size / total_materialized_size. A ratio of 0.05 means the delta was 5% of a full recompute.

pub fn to_jsonl(&self) -> String

Format as a JSONL line for the evidence sink.

Trait Implementations

impl Clone for EpochEvidence

fn clone(&self) -> EpochEvidence

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for EpochEvidence

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

Formats the value using the given formatter.