Split integration tests into patch and validate phases - #2318
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GitHub reclaims long-running jobs; since mid-August the `Integration test` jobs were routinely killed with `The runner has received a shutdown signal`, at times not even twelve minutes in. The kill time is not a fixed cap, so this change both lowers the time any single runner must survive and shortens the underlying builds. The `patch` phase applies Error Prone Support's suggested changes and validates the resulting diff; the `validate` phase replays those changes, builds and tests the result, and validates the emitted diagnostics. The two hand off through an artifact, and compare the tree they each analyze so that they cannot silently diverge. A `--phase` flag selects one of them; by default both still run in sequence. Summary of changes: - Every patch round now recompiles all sources. Partial recompilation makes a round cheaper, but such a round analyzes only the files its predecessor changed, so more rounds are then required to reach the fixed point. Measured on four CPUs: `checkstyle` 496s (6 rounds) -> 393s (3 rounds), `prometheus-java-client` 544s (8 rounds) -> 498s (5 rounds) and `metrics` 352s (4 rounds) -> 335s (3 rounds). This also subsumes the trailing full-recompilation round. - The Maven reactor is parallelized using `-T1C`. The workflow already requests this through `MAVEN_ARGS`, but the script clears that variable so that the environment cannot influence the test result. `checkstyle` consists of a single module and is unaffected (393s serial versus 395s parallel); the other two projects roughly halve each compilation round. This does require that `prometheus-java-client` declare the reactor dependencies whose ordering it so far left to chance, and that `ExemplarTest` not bind WireMock to a fixed port that a second, concurrent execution of that same test also claims. - `metrics` compiles in-process. The `--add-exports`/`--add-opens` flags Error Prone requires were passed as `-J` compiler arguments, which forces `<fork>true</fork>`; declaring them in `.mvn/jvm.config` instead takes a serial build of the unmodified project from 296.6s to 105.7s. As a consequence the build no longer emits the 57 javac lint warnings that `<showWarnings>` surfaced only in forked mode. All Error Prone Support diagnostics are retained, and neither of the other two integration tests asserts javac lint output either. - Both jobs are sandboxed more tightly than the job they replace. Neither needs a container runtime, as the tests that use Testcontainers are Failsafe-bound and `mvn package` never reaches the `integration-test` phase. `xvfb-run` is dropped as well: `checkstyle`'s GUI tests supply their own virtual AWT toolkit through Caciocavallo, and pass with no display at all. While there, the init patches record the upstream pull requests that would obviate the changes they make to the analyzed projects. See: - dropwizard/metrics#5366 - prometheus/client_java#2407
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📝 WalkthroughWalkthroughThe integration test runner now supports separate patch and validation phases. GitHub Actions transfers patch artifacts between jobs and combines both results. Java integration-test patches update compiler settings, dependencies, WireMock setup, assertions, and expected warnings. ChangesIntegration test phases
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟡 Moderate · up to The validation job currently disables container support even though the integration suite starts containerized tests, so the new validation phase may fail systematically and cannot provide the intended build-and-test gate. Merge should wait until the job permits the required containers; the remaining findings are localized follow-up items. Sequence Diagram(s)sequenceDiagram
participant GitHubActions
participant PatchJob
participant ArtifactStore
participant ValidateJob
participant ReportJob
GitHubActions->>PatchJob: Run patch phase
PatchJob->>ArtifactStore: Upload patch and tree artifacts
ArtifactStore->>ValidateJob: Download patch artifacts
ValidateJob->>ArtifactStore: Upload validation artifacts
PatchJob->>ReportJob: Provide patch result
ValidateJob->>ReportJob: Provide validation result
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Suggested commit message: Edit by Stephan: see above. |
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Actionable comments posted: 4
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In @.github/workflows/integration-tests.yml:
- Line 17: Remove the temporary sschroevers/speed-up-integration-tests entry
from the branches list in the push trigger, leaving master as the only
configured branch.
- Around line 202-215: Add retention-days: 7 to the with configuration of the
“Upload artifacts on failure” step, matching the existing artifact upload
settings in the patch job.
- Around line 168-183: Update the Harden-Runner configuration in the validate
job to use disable-sudo: true instead of disable-sudo-and-containers: true,
preserving sudo restrictions while allowing Testcontainers used by PushGatewayIT
and ExporterTest. Extend allowed-endpoints with the required container-registry
hosts needed during mvn clean package.
In `@integration-tests/run-integration-test.sh`:
- Around line 247-265: Update the replay logic around git apply in the validate
phase to catch application failures and emit a clear message indicating that the
checked-out revision or init patch differs from the inputs used by the patch
phase, while preserving the existing failure status and tree comparison
behavior.
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Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
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📒 Files selected for processing (9)
.github/workflows/integration-tests.ymlintegration-tests/checkstyle.shintegration-tests/metrics-expected-warnings.txtintegration-tests/metrics-init.patchintegration-tests/metrics.shintegration-tests/prometheus-java-client-expected-changes.patchintegration-tests/prometheus-java-client-init.patchintegration-tests/prometheus-java-client.shintegration-tests/run-integration-test.sh
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Validated the changes by temporarily adding this branch it to the workflow's
The longest job is 13.4 minutes, against the 17-19 minutes that the jobs this change replaces were taking before they were reclaimed. Note that GitHub's kill time is not a fixed cap, so this reduces exposure rather than eliminating it. |
This reverts commit 39ee4ef.
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Two review remarks: - A failure to replay the `patch` phase's changes now names the phases involved, as `git apply`'s own output does not reveal that two separate machines disagreed about the code under analysis. - Two `prometheus-java-client` modules copy the sources they shade without declaring a dependency on the module that produces them, which `-T1C` can race with. Declaring those dependencies would alter what the Shade plugin bundles, so the caveat is recorded rather than addressed here.
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| .withWorkingDirectory("/app") | ||
| .withLogConsumer(LogConsumer.withPrefix(sampleApp)) | ||
| --- a/integration-tests/it-exporter/it-exporter-test/pom.xml | ||
| +++ b/integration-tests/it-exporter/it-exporter-test/pom.xml |
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The initial patch now contains a variation to the changes proposed upstream in prometheus/client_java#2407. Claude flagged an additional -T1C risk that I couldn't trigger to cause an issue, so for now I left it out:
prometheus-metrics-exporter-opentelemetry-shaded and prometheus-metrics-exposition-formats-shaded copy the sources of the sibling module they shade — ../prometheus-metrics-exporter-opentelemetry/src and ../prometheus-metrics-exposition-formats/src respectively — during their own
validate phase, and compile the copies via build-helper:add-source. Neither declares a dependency on the module that produces those sources, so Maven does not order them; serial builds work only by accident of module declaration order. Under -T1C such a copy can therefore observe sources that Error Prone is concurrently rewriting in place, which would show up as a spurious compilation failure or a varying number of patch rounds.
We are not acting on it here. The artifact IDs do differ, so the dependencies could be declared, but doing so would change what the Shade plugin bundles, which needs upstream judgement rather than a local workaround. The window is evidently narrow: five full runs, two local and three on CI, have all passed.
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Some further context.
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Now that this build no longer runs a forked version of javac, the non-Error Prone warnings are no longer emitted; this is benign.
| disable-sudo-and-containers: true | ||
| allowed-endpoints: > | ||
| api.adoptium.net:443 | ||
| auth.docker.io:443 |
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With the current versions we're building against, Docker isn't necessary anymore for mvn clean package. This would change if we ran mvn clean verify, but as that again lengthens the build, let's not do that for now.
| - name: Install project to local Maven repository | ||
| run: mvn install -DskipTests -Dverification.skip | ||
| - name: Run integration test | ||
| run: xvfb-run "./integration-tests/${INTEGRATION_TEST}.sh" "${{ runner.temp }}/artifacts" |
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xvfb-run is no longer necessary, as Checkstyle now uses another library for the tests that previously required it.
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Damn, I can see how this cost a lot of time to get right... Very nice to see a step up in this area! 🚀
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