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| tests also catch errors that are hard to predict in the design and |
| implementation stages.</p><p>Even though post-commit tests run after the code is merged into the repository, |
| it is important that the tests pass reliably. Jenkins executes post-commit tests |
| against the HEAD of the <code>master</code> branch. If post-commit tests fail, there is a |
| problem with the HEAD build. In addition, post-commit tests are time consuming |
| to run, and it is often hard to triage test failures.</p><h2 id=policies>Policies</h2><p>To ensure that Beam’s post-commit tests are reliable and healthy, the Beam |
| community follows these post-commit test policies:</p><ul><li><a href=/contribute/postcommits-policies-details/index.html#rollback_first>Rollback first</a></li><li><a href=/contribute/postcommits-policies-details/index.html#failing_test_is_critical_bug>A failing test is a critical bug</a></li><li><a href=/contribute/postcommits-policies-details/index.html#flake_is_failing>A flaky test is a critical bug</a></li><li><a href=/contribute/postcommits-policies-details/index.html#remove_flake>Flaky tests must either be fixed or removed</a></li><li><a href=/contribute/postcommits-policies-details/index.html#precommit_for_postcommit>Fixes for post-commit failures should include a corresponding new pre-commit test</a></li></ul><h2 id=post-commit-test-failure-scenarios>Post-commit test failure scenarios</h2><p>When a post-commit test fails, follow the provided steps for your situation.</p><h3 id=found-failing-test>I found a test failure</h3><ol><li>Create a <a href=https://github.com/apache/beam/issues/new/choose>GitHub issue</a> and assign it to yourself.</li></ol><ul><li>Components: testing, anything else relevant</li><li>Label: precommit</li><li>Reference this page in the description.</li></ul><ol><li>Do high level triage of the failure.</li><li><a href=/contribute/postcommits-guides/index.html#find_specialist>Assign the issue to a relevant person</a>.</li></ol><h3 id=assigned-failing-test>I was assigned an issue for a test failure</h3><ol><li><a href=/contribute/postcommits-guides/index.html#rollback>Rollback the culprit change</a>.</li><li>If you determine that rollback will take longer than 8 hours, <a href=/contribute/postcommits-guides/index.html#disabling>disable the |
| test temporarily</a> while you rollback or create a |
| fix.</li></ol><blockquote><p>Note: Rollback is always the first course of action. If a fix is trivial, |
| open a pull request with the proposed fix while doing rollback.</p></blockquote><h3 id=pr-rolled-back>My change was rolled back due to a test failure</h3><p>After rollback there is time for deeper investigation. Start by looking at the |
| GitHub issue to see the background information for the rollback. These scenarios |
| are all common:</p><ul><li>Your change contained a bug.</li><li>Your change exposed an existing bug.</li><li>Your change exposed a bad test (flaky, overspecified, etc).</li></ul><p><em>These are all valid reasons for rollback. Maintaining clear signal is the |
| highest priority.</em></p><p>The high level steps are the same:</p><ol><li>Create a fix and re-run the post-commit tests.</li><li>Implement new pre-commit tests that will catch similar failures |
| before future code is merged into the repository.</li><li>Open a new PR that contains your fix and the new pre-commit tests.</li></ol><p>If the bug is not in your code, here is how to “create a fix”:</p><ol><li>File a ticket for the existing bug, if it does not already exist. |
| Remember that |
| <a href=/contribute/postcommits-policies-details/index.html#flake_is_failing>a flaky test is a critical bug</a>. Other |
| bad tests are similar: they may fail for arbitrary reasons having nothing |
| to do with what is being tested, making our signal unreliable.</li><li>Mark the problematic test to be skipped, with a link to the GitHub issue.</li></ol><h2 id=useful-links>Useful links</h2><ul><li><a href=https://cwiki.apache.org/confluence/display/BEAM/Contribution+Testing+Guide#ContributionTestingGuide-Bestpracticesforwritingtests>Best practices for writing tests</a></li></ul><h2 id=references>References</h2><ol><li><a href=https://lists.apache.org/thread.html/3bb4aa777751da2e2d7e22666aa6a2e18ae31891cb09d91718b75e74@%3Cdev.beam.apache.org%3E>Keeping post-commit tests green</a> |
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