fix(ci): select shards from the PR's own change; route tests and uncovered lines - #2156
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…vered lines Every runtime pull request that was behind master, or that touched a test file, ran all 116 shards. Reproduced on #2100's exact merge commit with the exact certified map CI used: 22 changed files, 25 escalation reasons, full matrix. With this change the same inputs select 4 of 116 shards. Three independent causes, all fixed here: 1. Stale base. The selector diffed from github.event.pull_request.base.sha, which is the base branch as it was when the pull request was opened. For a pull request behind master it charged every commit master had gained since to the pull request (16 merged CI-control files on #2100). The selector now takes the pull request head, verifies the checkout is the two-parent merge of it, and uses the merge commit's first parent: the base actually tested. Only the pull request's own paths are selected for; map line numbers still come from the map commit. 2. Test sources are never in the coverage map (5,931 of 5,932 map files are under src/), so any test-file edit escalated. They are now routed to the shards whose test-shards.yml filters select their tests, following the transitive closure of test files that use their types. Anything reference search cannot follow (extension methods, collection definitions, assembly attributes, abstract bases and types the source generator names, which build-time generated tests can derive from) still escalates. 3. A changed range no shard executes (field declarations, attributes, the insertion point of new code) escalated. It now routes to every shard that executes the same file; a new .cs file routes to the owners of its nearest mapped directory, never above a two-segment root. Unmapped non-C# files still escalate, and src/AiDotNet.Generators is now explicit full validation because it runs inside the compiler. Every selected shard now logs why it was selected. The nightly miss audit passes the audited tree's manifest through, so it measures the new routing against complete matrices. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_017otuSGr3GdmvPoYLbiaWR2
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WalkthroughThe change makes shard selection pull-request-aware. It resolves the merge base from the pull-request head, routes changed test sources through shard filters, records selection reasons, updates map audits, and adds coverage for stale-base, routing, and escalation cases. ChangesPull-request-aware selection
Estimated code review effort: 4 (Complex) | ~60 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant GitHubActions
participant SelectShards
participant GitMerge
participant TestSources
participant ShardFilters
GitHubActions->>SelectShards: pass pull-request head and shard manifest
SelectShards->>GitMerge: resolve merge commit first parent
GitMerge-->>SelectShards: return pull-request base
SelectShards->>TestSources: parse changed test sources and references
TestSources-->>SelectShards: return test candidates and hazards
SelectShards->>ShardFilters: evaluate shard filters
ShardFilters-->>GitHubActions: return selected shards and route reasons
Suggested reviewers: Merge Risk: ⚪ Minimal · up to Merge-group runs retain full-matrix coverage, so this change has no supported merge-blocking risk. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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In `@tools/TestImpact/Select-Shards.ps1`:
- Around line 359-367: Update Select-ImpactedShards to build the directory-owner
projection once per selection run, then pass it into Get-DirectoryOwners for
each unmapped non-test C# path. Replace the helper’s repeated enumeration of
Map.files at every directory depth with lookups against this per-run index,
ensuring the index is scoped to the current map and not stored in an unkeyed
$script: cache.
In `@tools/TestImpact/Test-CiImpactWorkflow.ps1`:
- Around line 262-263: Update the assertions for the map-backed selector
invocation in the complete $selectStep validation to require -PullRequestHeadSha
alongside -MapFile, not only on -ClassifyOnly. Preserve the existing stale
base.sha and -BaseSha checks so both CI workflows verify pull-request scoping
correctly.
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.github/workflows/sonarcloud.yml.github/workflows/test-impact-map.ymltools/TestImpact/Measure-SelectionMiss.ps1tools/TestImpact/Select-Shards.ps1tools/TestImpact/Test-CiImpactWorkflow.ps1tools/TestImpact/Test-TestImpactEndToEnd.ps1
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…ead multi-line modifiers Three defects in the selector, raised in review of #2159 against code this PR introduced: - Select-Shards fell off the end without `exit`, so its exit code was the last native command's. Test-source routing runs git grep, which exits 1 when nothing matches - e.g. the type names of a test file the pull request deletes - and the workflow reads a nonzero exit as a selector failure and runs the full matrix, discarding a valid selection. Reproduced with a real repository: selection {Alpha}, escalate false, exit code 1. Now exit 0; the new end-to-end case fails without it ("a valid selection exited 1"). - Escalation results had no `routes` property while successful ones did; consumers reading it under StrictMode crash on the escalated shape. - Get-CSharpTestShape read declaration modifiers from the keyword's line only, so `public abstract` or `file` on the line above `class` was lost and an abstract base could be routed instead of escalating. Modifiers now run back to the previous declaration or attribute boundary. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_017otuSGr3GdmvPoYLbiaWR2
…rtifact, harden reads Review of #2159: - The delta-map step had no duration bound; continue-on-error limits the outcome, not the time, so a stalled gh call could eat the job's margin before the resolver's own 40-minute wait began. timeout-minutes: 10. - A partial plan imports coverage-<tested>-<slug> and test-results-<tested>-<slug> for every imported shard by exact name, and every consumer fails on a missing one. The resolver now checks both exist in the pull request run (Get-MissingImportArtifacts) and declines to the full matrix instead of emitting a plan that turns the landed commit red. - Selector output is read through Get-OptionalArray, so an older or escalated result without routes/reasons cannot crash the resolve step under StrictMode (the selector side of this landed in #2156). - A contract pins the step's id (delta-map), which its outputs are read through, and its timeout. Also rebased onto #2156's review commits (directory-owner index, exit 0, result-shape and multi-line-modifier fixes); the two end-to-end additions were independent and are both kept. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_017otuSGr3GdmvPoYLbiaWR2
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Timed dependency review at dce65d3: zero unresolved threads. Locally ran Select-Shards.ps1 -SelfTest, Measure-SelectionMiss.ps1 -SelfTest, and Test-TestImpactEndToEnd.ps1; all passed. This does NOT make the PR merge-ready: hosted run 34596861846 failed DBN loss, StyDiff clone parity, custom-Transformer InputLayer reconstruction, and distributed-builder backend-consumption tests. Integration D received a runner shutdown signal (the log alone does not prove OOM). Vercel also reports a build-rate limit. #2183 targets DBN; #2112 describes StyDiff/COW fixes; #2185 concerns related cloning defects, but neither is established here as fixing these exact failures. No selector assertion was weakened and no blanket rerun was requested. |
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Runtime follow-up now has concrete dependency proof: #2185 at 2811e7a passed the exact custom-Transformer InputLayer failure plus three clone regressions (4/4 locally). #2112 current-head hosted logs explicitly pass StyDiff clone parity (65/65 shard) and Integration D (2091 passed, 28 skipped). #2183 at 0e0c2a9 fixes both lazy-gradient snapshot timing and stale shard-layout caching in shared base classes; final local run passed 76/76, including the original DDP test, all five affected strategies and two-rank math checks. These fixes are in their dependency PRs, not yet merged into this selector branch. No claim that #2156 is green or merge-ready until those dependencies land and checks clear. |
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Summary
Almost every runtime pull request has been running the full 116-shard matrix (~2h+) even though shard selection "worked" in every proof. This PR fixes the three causes, each reproduced on real data first.
Headline, on real data: #2100's exact merge commit (
ecf5a4ba8), the exact certified map CI downloaded (run 34428489968, map sha8decd96c), and the exact inputs CI passed:The "before" row isn't an estimate. Running master's selector locally on that commit reproduces CI's log line for line: the same 22 files and the same 25 reasons (log of job 103066400544).
Why every earlier proof passed but real PRs didn't
The earlier canaries were fresh PRs branched from current master that touched only mapped
src/lines or non-runtime files. That's the one shape that avoids all three causes below. #2118 "worked" only because it was non-runtime (docs + an independent workflow), which never reaches coverage selection. Real PRs are usually behind master and almost always add or edit a test, and each of those alone forces the full matrix.Root cause 1: the stale base (
github.event.pull_request.base.sha)Before. The Select step passed
-BaseSha ${{ github.event.pull_request.base.sha }}. That SHA is the base branch as it was when the PR was opened, not what GitHub merged it onto for this run. For #2100 it was8decd96c, but the merge ref was built on88364e91, 33 commits later. The selector's own rule, "a selection-control edit in this PR forces the full matrix", then fired on 16 CI files master had merged in between:It feeds itself: every CI-fix PR edits
tools/TestImpact/, so each merge pushes every behind PR into a full run.After. The workflow passes the PR head (
github.event.pull_request.head.sha).Resolve-PullRequestBasechecks that the checkout is a two-parent merge whose second parent is that head, then uses the first parent, the base actually tested. A non-merge checkout, or a head that isn't the second parent, fails closed. Only the PR's own paths are selected for. Line ranges still come from the map commit, the only coordinates the map's ranges are expressed in. Two new fail-closed cases:Root cause 2: test files are never in the coverage map
Before. Coverage instruments product code only. 5,931 of the map's 5,932 files are under
src/, so every test-file edit escalated (not executed by any mapped shard: tests/.../TradingAgentLearningTests.cs). Almost every PR adds or edits a test.After. Changed test sources are routed to the shards whose
.github/test-shards.ymlfilters select their tests (Get-TestFileRoutes):{in a string orclass Xin a comment can't mislead brace matching. That gives namespace, nestedOuter+Innerchains, and[Fact]/[Theory]methods, which become the VSTestFullyQualifiedName.& | ( ),= != ~ !~,&binding tighter) and evaluated with three-valued logic. A shard is skipped only when its filter is definitely false for every test. Whatever the parser can't know counts as "might match": casing disagreements, categories inherited from a base, and method names of inherited tests. An inherited test's unknown part is modelled as one method identifier, so it can't acquire a namespace term.TestScaffoldGeneratoremits test classes deriving from test-project bases at build time, which exist in no file reference search could read.Measured on 250 randomly sampled real test files (seed 20260911): 82% route, median 1 shard, mean 2.2, max 16. The rest escalate for the conservative reasons listed above.
Root cause 3: unexecuted changed lines
Before. A changed range no shard executes escalated. On #2100 all 8 such ranges were field declarations, attributes or between-method insertion points, lines coverage never records:
After. Per your decision, such a range routes to every shard that executes any line of the same file. A new
.csfile routes to the owners of its nearest mapped directory, never climbing above a two-segment root likesrc/Finance. Still escalates: unmapped non-C# files (.csproj, props, data), orphans with no mapped neighbour, andsrc/AiDotNet.Generators/**, now explicit full validation. That code runs inside the compiler, so runtime coverage never records it, yet one edit can rewrite thousands of generated tests. Before this PR it escalated only because that directory happened to be unmapped.This is a heuristic, and the nightly selection-miss audit is its backstop. The audit now receives the audited tree's shard manifest, so it replays exactly the routing PRs get against complete matrices, and any miss revokes the map certificate (PRs then fall back to full runs).
Every selected shard now says why
Proof
All nine impact-tooling suites pass locally under pwsh 7.6:
Select-Shards -SelfTest,Measure-SelectionMiss -SelfTest,Test-CiImpactWorkflow,Test-TestImpactEndToEnd,New-ShardMap -SelfTest,Select-CoverageShards -SelfTest,Test-CertifiedShardMap -SelfTest,Test-CiGateModes,Test-ValidationReuseModes.This PR's own CI will run the full matrix. That's correct: it edits selection-control files, which must always get complete validation.
Files
tools/TestImpact/Select-Shards.ps1-PullRequestHeadSha(merge-parent base, verified) and-ShardManifestFile; PR scoping; owner/directory routing; VSTest filter parser + three-valued evaluator; C# code-only lexer and test-shape reader; test routing with hazards;routesin the JSON output; build-time directory as full validation; self-tests..github/workflows/sonarcloud.ymlPR_HEAD_SHAreplaces the eventbase.sha; writesshard-manifest.json; passes both to the classifier and selector..github/workflows/test-impact-map.ymltools/TestImpact/Measure-SelectionMiss.ps1-ShardManifestFilepassthrough.tools/TestImpact/Test-CiImpactWorkflow.ps1pull_request.base.shaor pass-BaseSha; must pass the head and manifest; the selector must verify both merge parents; the audit must pass the manifest.tools/TestImpact/Test-TestImpactEndToEnd.ps1What this deliberately does not do
find-test-baseline.ps1, the retry-baseline and comparison steps) still uses the eventbase.sha. Switching it to the merge parent is correct in principle, but that lookup needs an exact master run, and 11 of the last 12 master runs were cancelled by the next merge. So today it would usually find no baseline at all. It belongs with the master-run work.UnitTests.NeuralNetworks(all but four named classes),UnitTests.Evolution.Programs,ContinualLearning,UnitTests.Agentic, andGenerators.check-shard-coverage.ps1only checks generated ModelFamily classes, so nothing reports this. Some are intentional (GPU/stress) and some are abstract bases whose tests run through derived classes, so the number needs confirming against real test discovery before anything changes. Edits to these files still escalate here, which is safe but runs 116 shards that don't include the edited tests.🤖 Generated with Claude Code
https://claude.ai/code/session_017otuSGr3GdmvPoYLbiaWR2
Summary by CodeRabbit
Bug Fixes
Tests