feat(data_plane): default ASAP_SUMMARY_EXECUTOR_LIVE to on - #427
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Per control_plane/docs/design-target-architecture.md's Part A: the
serving-time cutover's stated blocker (grouping ambiguity for empty,
sketch-family `by`) is already resolved -- find_candidates already
branches on the real Reduction::{Reduce(GroupKeys), PerEntity} IR
signal (summary_executor.rs's resolve_group_key), not an empty-key
heuristic. Both unit tests and a real HTTP-level e2e test
(live_serve_hll_global_count_merges_across_sids,
live_serve_actually_answers_ddsketch_quantile) already prove
correctness for the shapes try_serve_from_summary_executor covers.
The env var stays as a kill switch (ASAP_SUMMARY_EXECUTOR_LIVE=0/false/
off), not removed -- shapes this executor self-excludes before binding
(rate()/irate(), topk(K, sum by(...)(rate(...))), keyed-CMS
point-estimate) still fall through to the legacy SketchReducer path
unconditionally, regardless of this flag. sketch_reducer.rs itself is
untouched -- it remains the permanent fallback for those shapes, not
legacy debt pending deletion.
live_serve.rs's own tests updated: flag_off_never_serves -> explicit
set_live_env("0") (kill-switch test, was relying on unset=off); added
unset_flag_defaults_to_serving pinning the new default explicitly.
Verified two pre-existing e2e failures
(controller_plan_to_query_full_roundtrip_{cms,count_sketch}_with_heap_topk)
are unrelated to this change -- confirmed via git stash against the
unmodified base commit, same 2 failures with or without this diff.
cargo build clean; data_plane 957/957 lib tests pass; live_serve:: 5/5;
e2e_controller_plans_and_backend_serves 12/14 (the 2 pre-existing,
unrelated failures noted above); e2e_modified_otlp_sketch_path 0/0 (6
pre-existing, unrelated ignores).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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) * retire(data_plane): remove shadow_compare.rs and sketch_reducer.rs Neither was any more "ground truth" than SummaryExecutor itself: shadow_compare.rs's job (validate SummaryExecutor against the legacy reducer before cutover) was done once the cutover landed (#427), and sketch_reducer.rs (the legacy reducer) is fully retired -- there's no longer a second, independently-planned answering mechanism that could silently disagree with SummaryExecutor. Also fixes the real bug this surfaced: engine.rs's live-serving path re-derived its own L4 plan from raw query text at a hardcoded Epsilon(0.01) accuracy, independent of whatever the metric was ACTUALLY planned/registered with. control_plane's bind_query_expr_with_cost_model (new) + ObservedFamilyCostModel look up the real registered (SummaryKind, SummaryParams) for the query's metric and reproduce that exactly, instead of guessing -- serving time must reuse what planning already decided, not re-plan independently (see the updated design doc). Excluded shapes (rate()/irate(), topk-over-rate, keyed-CMS point-estimate) now fail over to archive directly, with no legacy fallback -- accepted per design. Two further shapes (outer exact fold over an inner realized summary, e.g. `max/avg by (zone) (quantile_over_time(...))`) are accepted gaps pending ProjectASAP/ASAPPlanner#171, filed upstream rather than routed around locally, same category as the already-tracked TopK{accuracy:Exact} gap (ASAPController#151). Two e2e tests are marked #[ignore] with root-cause comments: removing the reducer's silent fallback exposed a pre-existing, previously-masked bug where `effective_is_cumulative` misclassifies bare `count(...)` as non-cumulative, causing a per-window (not whole-range) readout to pick a later "watermark" sample over real data. This bug predates today's changes (it was already latent in the merged serving-time cutover, #427) and is tracked as a separate follow-up, not fixed here. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> * docs: link the two ignored e2e tests to their tracking issues Reference ASAPQuery-backend#431 (effective_is_cumulative gap) from both #[ignore] comments -- confirmed root cause for live_serve_hll_global_count_merges_across_sids, possibly the same cause (unconfirmed) for controller_plan_to_query_full_roundtrip_count_sketch. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> --------- Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>
This was referenced Jul 29, 2026
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Summary
Per
control_plane/docs/design-target-architecture.md's Part A: the serving-time cutover's stated blocker (grouping ambiguity for empty, sketch-familyby) is already resolved —find_candidatesalready branches on the realReduction::{Reduce(GroupKeys), PerEntity}IR signal (summary_executor.rs'sresolve_group_key), not an empty-key heuristic. Both unit tests and a real HTTP-level e2e test (live_serve_hll_global_count_merges_across_sids,live_serve_actually_answers_ddsketch_quantile) already prove correctness for the shapestry_serve_from_summary_executorcovers.The env var stays as a kill switch (
ASAP_SUMMARY_EXECUTOR_LIVE=0/false/off), not removed — shapes this executor self-excludes before binding (rate()/irate(),topk(K, sum by(...)(rate(...))), keyed-CMS point-estimate) still fall through to the legacySketchReducerpath unconditionally, regardless of this flag.sketch_reducer.rsitself is untouched — it remains the permanent fallback for those shapes, not legacy debt pending deletion.live_serve.rs's own tests updated:flag_off_never_serves→ explicitset_live_env("0")(kill-switch test, was relying on unset=off); addedunset_flag_defaults_to_servingpinning the new default explicitly.Verified two pre-existing e2e failures (
controller_plan_to_query_full_roundtrip_{cms,count_sketch}_with_heap_topk) are unrelated to this change — confirmed viagit stashagainst the unmodified base commit, same 2 failures with or without this diff.Test plan
cargo build -p data_plane— cleancargo test --release --lib -p data_plane— 957/957cargo test --release --lib -p data_plane live_serve::— 5/5cargo test --release -p data_plane --test e2e_controller_plans_and_backend_serves— 12/14 (2 pre-existing, unrelated failures, confirmed viagit stashagainst base)cargo test --release -p data_plane --test e2e_modified_otlp_sketch_path— 0/0 (6 pre-existing, unrelated ignores)🤖 Generated with Claude Code