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feat(control_plane): emit shard_count=12 (ASAP_SHARD_COUNT) to smooth edge flush #343

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Merged
zzylol merged 1 commit into from
May 26, 2026
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feat(control_plane): emit shard_count=12 (ASAP_SHARD_COUNT) to smooth edge flush #343

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16 changes: 11 additions & 5 deletions control_plane/src/emit/stage_config.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1687,10 +1687,16 @@ fn emit_edge_yaml_asap_edge(
// no-op check.
let window_secs = clamp_window_secs(cfg.window_secs).unwrap_or(MAX_WINDOW_SECS);

// shard_count: fixed at 4 (the fused contract's default — key-hash
// sharding for multi-core decode). No `EdgeStageConfig` field plumbs
// a per-deploy override yet; 4 matches the hand-written config.
let shard_count: u64 = 4;
// shard_count: key-hash sharding for multi-core decode AND flush
// staggering — flushLoop phase-shifts one shard per (WindowDuration/
// shard_count) tick, so a higher count spreads the per-flush CPU+memory
// burst into more, smaller bursts (smoother under the dense raw-buffer
// workload). Default 12; env-overridable via ASAP_SHARD_COUNT.
let shard_count: u64 = std::env::var("ASAP_SHARD_COUNT")
.ok()
.and_then(|s| s.parse().ok())
.filter(|&n| n >= 1)
.unwrap_or(12);

let mut metric_entries: Vec<Value> = Vec::new();

Expand Down Expand Up @@ -5514,7 +5520,7 @@ mod tests {
.expect("asap_edge processor present");
assert_eq!(
asap_edge.get("shard_count").and_then(|v| v.as_u64()),
Some(4),
Some(12),
"shard_count\n{yaml}"
);
assert_eq!(
Expand Down