fix(traces): partition trace_facets_hourly by day - #1116
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Tinybird rejects the deploy: a 30-day TTL is shorter than the monthly partition period. Partition by day instead, like trace_list_mv. Migration 0034 is edited in place: it shipped with the API a few hours ago and no cluster has applied it, and a BYO ClickHouse cluster that did would only carry the coarser partitioning, which ClickHouse accepts. Local schema v25 recreates the rollup and rebuilds it from trace_list_mv, since v24 is frozen once on main.
Maple reviewConfidence 4/5 · likely safe to merge Partitions
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Navigate logical layers of code changes, visualize relationships, and explore their blast radius. 📝 WalkthroughWalkthroughThe trace facets rollup now uses daily partitions instead of monthly partitions. Local schema version 25 adds a migration that recreates and rebuilds the rollup from retained root spans. Schema identity metadata, project revision identifiers, and migration checks are updated. ChangesHourly trace-facets daily partition
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant LocalStoreMigration
participant FacetRollup
participant LocalSchemaBootstrap
participant TraceListMV
LocalStoreMigration->>FacetRollup: Drop view and table
LocalStoreMigration->>LocalSchemaBootstrap: Bootstrap schema v25
LocalStoreMigration->>FacetRollup: Rebuild hourly facets
TraceListMV-->>FacetRollup: Provide retained root-span aggregates
Suggested reviewers: Merge Risk: 🟡 Moderate · up to Confirm whether existing ClickHouse databases have applied migration 0034 and provide a follow-up migration if they have; otherwise, those databases will retain the old partition layout. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The rebuild is staged while the local store is stopped, and no new authorization path was identified. Risk remains in how installations that already applied the older database migration converge on the daily-partition layout and in the unverified completeness of a rebuilt rollup. Retained concerns Security review detailsSecurity Blast Radius
Trust Boundaries and Controls
Resilience and Maintainability Implications
Hardening Proposals
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches📝 Generate docstrings
🧪 Generate unit tests (beta)
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| statements: [ | ||
| "DROP VIEW IF EXISTS trace_facets_hourly_mv", | ||
| "CREATE TABLE IF NOT EXISTS trace_facets_hourly (\n OrgId LowCardinality(String),\n Hour DateTime,\n ServiceName LowCardinality(String),\n SpanName String,\n HttpMethod LowCardinality(String),\n HttpStatusCode LowCardinality(String),\n DeploymentEnv LowCardinality(String),\n ServiceNamespace LowCardinality(String),\n HasError UInt8,\n TraceCount SimpleAggregateFunction(sum, UInt64),\n DurationMin SimpleAggregateFunction(min, UInt64),\n DurationMax SimpleAggregateFunction(max, UInt64),\n DurationQuantiles AggregateFunction(quantilesTDigest(0.5, 0.95), UInt64)\n)\nENGINE = AggregatingMergeTree\nPARTITION BY toYYYYMM(Hour)\nORDER BY (OrgId, Hour, ServiceName, SpanName, HttpMethod, HttpStatusCode, DeploymentEnv, ServiceNamespace, HasError)\nTTL Hour + INTERVAL 30 DAY", | ||
| "CREATE TABLE IF NOT EXISTS trace_facets_hourly (\n OrgId LowCardinality(String),\n Hour DateTime,\n ServiceName LowCardinality(String),\n SpanName String,\n HttpMethod LowCardinality(String),\n HttpStatusCode LowCardinality(String),\n DeploymentEnv LowCardinality(String),\n ServiceNamespace LowCardinality(String),\n HasError UInt8,\n TraceCount SimpleAggregateFunction(sum, UInt64),\n DurationMin SimpleAggregateFunction(min, UInt64),\n DurationMax SimpleAggregateFunction(max, UInt64),\n DurationQuantiles AggregateFunction(quantilesTDigest(0.5, 0.95), UInt64)\n)\nENGINE = AggregatingMergeTree\nPARTITION BY toDate(Hour)\nORDER BY (OrgId, Hour, ServiceName, SpanName, HttpMethod, HttpStatusCode, DeploymentEnv, ServiceNamespace, HasError)\nTTL Hour + INTERVAL 30 DAY", |
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🟡 Existing facet rollups retain monthly partitions
On clusters that already applied version 34, migration_0034_trace_facets_hourly never runs again. Apply migrations skips recorded versions, leaving their facet rollups partitioned monthly.
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ClickHouse schema migrations are versioned. Once version 34 has been recorded, the CLI and API apply paths skip it on later runs. Editing its CREATE TABLE statement changes only clusters that have not applied it; an existing monthly-partitioned table cannot be converted by CREATE TABLE IF NOT EXISTS. The existing migration also truncates the rollup, so simply replaying it without replacing the table would not change its partition key.
Example: A BYO cluster applied version 34 last week and has PARTITION BY toYYYYMM(Hour). Applying this release skips version 34, so it still uses monthly partitions while a new cluster uses daily ones.
Recommended fix: Preserve version 34's original DDL and append a new migration that drops the materialized view, recreates the table with daily partitions, backfills it from trace_list_mv, reattaches the view, and records a new migration version. Account for source retention and retries when rebuilding the existing rollup.
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Known and accepted (see the PR description). The daily partition exists for Tinybird, which rejects a TTL shorter than the partition period; ClickHouse accepts the monthly one, and the schema diff compares columns only, so such a table reads as up to date and serves the same queries. 0034 shipped with the API a few hours before this, and no schema apply has run since, so no cluster is expected to carry it. A drop-and-rebuild migration for a hypothetical cluster would cost every BYO org a 30-day backfill for no functional change.
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Inline comments:
Review comments at
@packages/domain/src/clickhouse/migrations/0034_trace_facets_hourly.ts:
- Line 63: Add a new ClickHouse migration after migration 0034 that replaces
trace_facets_hourly with the intended partition definition and backfills its
data. Do not rely on rerunning migration 0034, since recorded versions are
skipped and CREATE TABLE IF NOT EXISTS will not alter an existing table’s
partition key.
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⛔ Files ignored due to path filters (2)
packages/domain/src/generated/clickhouse-schema.tsis excluded by!**/generated/**packages/domain/src/generated/tinybird-project-manifest.tsis excluded by!**/generated/**
📒 Files selected for processing (12)
apps/cli/src/server/local-schema-history.tsapps/cli/src/server/local-schema-version.tsapps/cli/src/server/local-store-migrations/steps.tsapps/cli/src/server/schema-identity.tsapps/cli/src/server/schema/local-inserts.jsonapps/cli/src/server/schema/local-schema-v25.sqlapps/cli/src/server/schema/local-schema.sqlapps/cli/test/local-store-migrations.test.tsapps/cli/test/native-local-store-migration.shapps/ingest/src/clickhouse_insert_mappings.rspackages/domain/src/clickhouse/migrations/0034_trace_facets_hourly.tspackages/domain/src/tinybird/datasources.ts
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Follow-up to #1112.
tinybird deployrejectstrace_facets_hourly: its 30-day TTL is shorter than its monthly partition period ("This can make TTL cleanup inefficient"). Partition by day (toDate(Hour)), the same astrace_list_mv. With this change,tinybird deploy --checkpasses againstmaple_eu.main, so v25 drops and recreates the rollup, then rebuilds it fromtrace_list_mv. v24 and v25 share one backfill constant. No CLI release has shipped v24.Verification:
clickhouse:schema:check,tinybird:manifest:check, the CLI local-store migration tests, the domain migration and retention tests, andtinybird deploy --checkagainstmaple_eu.Need help on this PR? Tag
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