perf(traces): read sidebar facets from the trace_facets_hourly rollup - #1113
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The traces sidebar facets (tracesFacets) run seven UNION branches, each a full scan of trace_list_mv over the page window. A busy org writes ~14M root spans a day there, so past about a day the query exceeds the 5s discovery budget and the sidebar fails (code 159). A single-pass rewrite measured only ~2x faster on prod data; a 3-day window still took 6.7s. trace_facets_hourly rolls trace_list_mv up hourly by the facet dimensions (service, span name, HTTP method/status, environment, namespace, error flag) with root-span counts and duration min/max/t-digest state, so the same answer is a read of a few hundred rows per org-hour (78 for our own org, against ~590k root spans). The view is cascaded off trace_list_mv, so its values are the ones the trace list filters on, with no fourth copy of the span-name rewrite. Migration 0034 (local schema v24) creates it, backfills the 30 days trace_list_mv retains with the view detached, then attaches the view. Schema only: nothing reads the table yet. The read path follows in a separate PR once the Tinybird populate has finished.
tracesFacets and tracesDurationStats now splice two tiers through rollup-splice: trace_facets_hourly answers every whole hour of the window and trace_list_mv only the partial hour at each end. The raw scan is bounded to under two hours whatever the window, instead of every root span in it (~100M rows for a 7-day window on a busy org, which timed out at 5s). Facet counts are summed across the tiers per value before the top-N cut. Duration stats merge the t-digest state across tiers and take min/max only from tiers that saw a row, so an empty tier's 0 never wins. Duration bounds and attribute/resource filters need the individual root span, so those requests keep reading trace_list_mv for the whole window (canUseTraceFacetsRollup). The splice-gate regex now counts trace_list_mv as a raw table, fixtures cover both routes, and a ClickHouse e2e checks the splice returns the same facets and duration extremes as the trace_list_mv-only route on a window that starts and ends mid-hour.
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Navigate logical layers of code changes, visualize relationships, and explore their blast radius. 📝 WalkthroughWalkthroughTrace facet and duration-stat queries now combine raw partial-hour data with hourly rollups for eligible time windows. Runtime queries retry with raw-only data when the rollup table is missing. SQL baselines, benchmark coverage, and tests were updated. ChangesTrace facet hourly rollups
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Refactor Sequence Diagram(s)sequenceDiagram
participant QueryEngine as query-engine.ts
participant QueryBuilder as errors.ts
participant Warehouse as Warehouse
QueryEngine->>QueryBuilder: Build eligible query with rawOnly false
QueryBuilder-->>QueryEngine: SQL with raw and hourly tiers
QueryEngine->>Warehouse: Execute SQL
Warehouse-->>QueryEngine: Configuration error names trace_facets_hourly
QueryEngine->>QueryBuilder: Build query with rawOnly true
QueryBuilder-->>QueryEngine: SQL with raw trace rows
QueryEngine->>Warehouse: Retry query
Suggested reviewers: Merge Risk: 🟡 Moderate · up to Fix the fallback condition before merging so a rollup query failure cannot unexpectedly trigger an expensive full-window trace scan. Security Architecture ReviewSecurity architecture risk: 🟡 Moderate · up to Reading the hourly rollup can substantially reduce query cost, but it makes accurate sidebar results depend on that rollup being populated before the new read path is enabled. A missing table has a fallback; an existing but incomplete table does not. Retained concerns
Security review detailsSecurity Blast Radius
Trust Boundaries and Controls
Resilience and Maintainability Implications
Hardening Proposals
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Maple reviewConfidence 4/5 · likely safe to merge Splices
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| // `colName` is a real `TraceListMv` column, so the accessor already knows how | ||
| const useRollup = canUseTraceFacetsRollup(opts) |
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🔴 Unmigrated clusters lose traces sidebar
On a cluster without migration 0034, tracesFacetsQuery and tracesDurationStatsQuery fail instead of reading root spans. The migration is optional for ingest, so healthy BYO clusters can lack the rollup.
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Migration 0034 creates the rollup but declares requiredForIngest: false in migration_0034_trace_facets_hourly. Existing BYO clusters can therefore ingest successfully before applying it. Both default sidebar queries now select the rollup, and executeCHUnionQuery passes a missing-table error to the caller without retrying. The duration-stats path likewise executes without fallback in makeQueryEngineExecute.
Example: An org running ClickHouse schema version 33 opens the traces page after deploying the new API. Its root spans still exist in trace_list_mv, but both default sidebar reads fail with UNKNOWN_TABLE for trace_facets_hourly.
Recommended fix: Detect the missing rollup at the runtime boundary and retry facets and stats using a forced raw-only route. Ensure the retry happens before responses are cached, as the existing service_overview_minutely fallback does.
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Fixed in 8af8ec3: the query engine retries with rawOnly (trace_list_mv only) when the cluster lacks trace_facets_hourly, like the service_overview_minutely fallback; the pipe surface, which has no retry path, keeps the raw read. Covered in QueryEngineService.test.ts.
| $.Timestamp.lte(param.dateTimeSeconds("endTime")), | ||
| ...traceFacetDimensionConditions($, opts), | ||
| CH.when(opts.minDurationMs, (v: number) => $.Duration.gte(v * 1000000)), | ||
| CH.when(opts.maxDurationMs, (v: number) => $.Duration.lte(v * 1000000)), |
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🟡 Zero-duration filter includes every trace
With maxDurationMs: 0, traceListWindowConditions drops the maximum-duration predicate. Facets and duration stats then include traces whose duration exceeds zero.
Learn more
The previous facets query applied Duration <= maxDurationMs * 1000000 whenever maxDurationMs != null. The shared helper now uses CH.when on the numeric value. A zero maximum is a valid bound on the unsigned Duration column, but it produces no predicate; the existing zero-minimum test explicitly relies on this CH.when behavior. The same helper feeds both facet and duration-stat queries.
Example: A request for facets with maxDurationMs: 0 and root spans lasting 0 ms and 5 ms now counts both. Previously it counted only the zero-duration span.
Recommended fix: Gate the maximum bound on opts.maxDurationMs != null, not numeric truthiness, and add a zero-maximum SQL assertion for both consumers.
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Not a bug: CH.when skips only undefined, null and false (effect-clickhouse when()), so maxDurationMs: 0 still compiles Duration <= 0. canUseTraceFacetsRollup uses == null, so a 0 bound also takes the trace_list_mv route.
…locally - TTL is Hour + 30 days, not toDate(Hour) + 30 days: a day's hours no longer expire up to a day before the trace_list_mv rows they summarize. - The local v23 -> v24 edge backfills the rollup from trace_list_mv, so an upgraded local store does not read empty whole hours for 30 days. - The rollup e2e now runs in CI, and checks the live view and the 0034 backfill against trace_list_mv in one pass. - Drop the warehouse catalog note and trim comments and tautological migration asserts.
…o perf/trace-facets-read-rollup # Conflicts: # packages/backend/src/services/warehouse/trace-facets-hourly-materialization.clickhouse.e2e.test.ts
…thout 0034 - Facets and duration stats build one union: the trace_list_mv tier, plus the trace_facets_hourly interior when the rollup can answer. The trace_list_mv-only route is the same union with one tier, instead of a second copy of every branch. - rawOnly reads trace_list_mv only. The runtime retries with it when the cluster lacks trace_facets_hourly (a BYO cluster that has not applied 0034), the same way it handles service_overview_minutely; the pipe surface (MCP, CLI) has no retry, so it keeps the raw read. - The rollup SQL enters the catalog through builder fixtures, since the pipe fixtures now compile the raw route. - e2e parity now seeds rows on both raw edges and a max only the hourly tier holds, and adds an hour-aligned window whose raw tier is empty. - Trim SQL-text asserts the splice gate and rollup-splice tests already cover.
Maple reviewConfidence 4/5 · likely safe to merge Routes the traces sidebar facets and duration stats through
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… resumed step cannot double it
…o perf/trace-facets-read-rollup
Maple reviewConfidence 4/5 · likely safe to merge Routes the traces sidebar facets and duration stats through the new
What was checked
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…d-rollup # Conflicts: # packages/backend/src/services/warehouse/trace-facets-hourly-materialization.clickhouse.e2e.test.ts
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Note A newer push replaced |
…is missing From the effect-review-v4 pass: - Retry only on the WarehouseConfigError that names trace_facets_hourly, and only when the read included the rollup. Before, any UNKNOWN_TABLE, or any error whose message named the table (a timeout reading it), reread the heavier raw table; a missing trace_list_mv logged a false cause. - Annotate the span with query.rollup.fallback, like the service_overview_minutely fallback, which is back to its original form. - Tests: the facets retry path beside stats, a timeout on the rollup that must surface without a retry, a filtered splice-vs-raw pass in the e2e with a failing staging root only the hourly tier holds, and the contains match on both tiers.
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Inline comments:
Review comments at @packages/query-engine/src/runtime/query-engine.ts:
- Around line 1289-1291: Restrict the retry condition to missing-table errors:
in the candidate check, require clickhouseType to be UNKNOWN_TABLE in addition
to the WarehouseConfigError tag and trace_facets_hourly message match, so other
failures propagate.
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Both Tinybird workspaces (
maple_us,maple_eu) havetrace_facets_hourlydeployed and backfilled (#1112, #1116); closed-day totals matchtrace_list_mvexactly in both.What
The traces sidebar's two queries,
tracesFacetsandtracesDurationStats, build one union:trace_list_mvtier, narrowed byrollup-spliceto the partial hour at each end when the rollup can answertrace_facets_hourlytier, for every whole hour in betweencanUseTraceFacetsRollupfalls back to thetrace_list_mvtier alone for the whole window when:rawOnlyis setrawOnlyis used for:WarehouseConfigErrornamingtrace_facets_hourly(a BYO cluster without 0034), and only when the read included the rollup; the span getsquery.rollup.fallback. A timeout or memory error on the rollup surfaces instead of rereading the raw tablefind_slow_traces, CLI): it has no retry path, so it keeps today's raw readNeither the traces page nor search autocomplete sends filters, so both always take the rollup route.
trace_list_mvrows scannedVerification
QueryEngineService.test.ts:UNKNOWN_TABLEontrace_facets_hourly→ retried ontrace_list_mvonly.unsplicedTwoTierQueriesnow treatstrace_list_mvas a raw table. The rollup SQL is in the catalog via builder fixtures; the SQL baseline is regenerated.tsc -p packages/query-engineclean.Summary by CodeRabbit