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| machines for each pull request (PR) submitted to |
| <a href=https://github.com/apache/beam>apache/beam</a>. For more information and the |
| difference between pre-commits and post-commits, see |
| <a href=https://cwiki.apache.org/confluence/display/BEAM/Contribution+Testing+Guide>testing</a>.</p><h2 id=what-are-fast-pre-commits>What are fast pre-commits?</h2><p>Pre-commit tests are required to pass before a pull request (PR) is merged. |
| When these tests are slow they slow down Beam’s development process. |
| The aim is to have 95% of pre-commit jobs complete within 30 minutes |
| (failing or passing).</p><p>Technically, the 95th percentile of running time should be below 30 minutes over |
| the past 4 weeks, where running time is the duration of time the job spends in |
| the Jenkins queue + the actual time it spends running.</p><h2 id=determining-slowness>Determining Slowness</h2><p>There are two main signs of slowness:</p><ol><li>Pre-commit jobs are timing out after 30 minutes. This can be determined from |
| the console log of a job.</li><li>Pre-commits aren’t timing out, but the total wait time for pre-commit results |
| is >30m.</li></ol><h3 id=pre-commit-dashboard>Pre-commit Dashboard</h3><p>The Beam Community Metrics site contains a <a href=http://metrics.beam.apache.org/d/_TNndF2iz/pre-commit-tests>Pre-Commit |
| Tests</a> dashboard showing |
| job timing trends. You can modify the time window (defaults to 7 days) or filter |
| down to a specific test suite by clicking on it.</p><p><img src=/images/precommit_dashboard.png alt="example pre-commit duration dashboard"></p><h2 id=triage-process>Triage Process</h2><ol><li><a href=https://github.com/apache/beam/issues>Search for existing |
| issues</a></li><li>Create a new issue if needed: <a href=https://github.com/apache/beam/issues/new/choose>GitHub Issues</a></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>Determine where the slowness is coming from and identify issues. Open |
| additional issues if needed (such as for multiple issues).</li><li>Assign the issue as appropriate, e.g., to the test’s or PR’s author.</li></ol><h2 id=resolution>Resolution</h2><p>It is important that we quickly fix slow pre-commit tests. See <a href=/contribute/precommit-policies/>pre-commit test |
| policies</a> for details.</p><h2 id=possible-causes-and-solutions>Possible Causes and Solutions</h2><p>This section lists some starting points for fixing pre-commit slowness.</p><h3 id=resource-exhaustion>Resource Exhaustion</h3><p>Have a look at the graphs in the Jupyter notebook. Does the rise in total |
| duration match the rise in queuing time? If so, the slowness might be unrelated |
| to this specific pre-commit job.</p><p>Example of when total and queuing durations rise and fall together (mostly): |
| <img src=/images/precommit_graph_queuing_time.png alt="graph of pre-commit times"></p><p>Since Jenkins machines are a limited resource, other jobs can |
| affect pre-commit queueing times. Try to figure out if other jobs have been |
| recently slower, increased in frequency, or new jobs have been introduced.</p><p>Another option is to look at adding more Jenkins machines.</p><h3 id=slow-individual-tests>Slow individual tests</h3><p>Sometimes a pre-commit job is slowed down due to one or more tests. One way of |
| determining if this is the case is by looking at individual test timings.</p><p>Where to find individual test timings:</p><ul><li>Look at the <code>Gradle Build Scan</code> link on the pre-commit job’s Jenkins page. |
| This page will contain individual test timings for Java tests only (2018-08).</li><li>Look at the <code>Test Result</code> link on the pre-commit job’s Jenkins page. This |
| should be available for Java and Python tests (2018-08).</li></ul><p>Sometimes tests can be made faster by refactoring. A test that spends a lot of |
| time waiting (such as an integration test) could be made to run concurrently with |
| the other tests.</p><p>If a test is determined to be too slow to be part of pre-commit tests, it should |
| be removed from pre-commit and placed in post-commit instead. In addition, |
| ensure that the code covered by the removed test is <a href=/contribute/postcommits-policies-details/#precommit_for_postcommit>covered by a unit test in |
| pre-commit</a>.</p><h3 id=slow-integration-tests>Slow integration tests</h3><p>Integration test slowdowns may be caused by dependent services.</p><h2 id=references>References</h2><ul><li><a href="https://docs.google.com/document/d/1udtvggmS2LTMmdwjEtZCcUQy6aQAiYTI3OrTP8CLfJM/edit?usp=sharing">Beam Fast Precommits design doc</a></li></ul><div class=feedback><p class=update>Last updated on 2024/05/18</p><h3>Have you found everything you were looking for?</h3><p class=description>Was it all useful and clear? Is there anything that you would like to change? Let us know!</p><button class=load-button><a href="https://docs.google.com/forms/d/e/1FAIpQLSfID7abne3GE6k6RdJIyZhPz2Gef7UkpggUEhTIDjjplHuxSA/viewform?usp=header_link" target=_blank>SEND FEEDBACK</a></button></div></div></div><footer class=footer><div class=footer__contained><div class=footer__cols><div class="footer__cols__col footer__cols__col__logos"><div class=footer__cols__col__logo><img src=/images/beam_logo_circle.svg class=footer__logo alt="Beam logo"></div><div class=footer__cols__col__logo><img src=/images/apache_logo_circle.svg class=footer__logo alt="Apache logo"></div></div><div class=footer-wrapper><div class=wrapper-grid><div class=footer__cols__col><div class=footer__cols__col__title>Start</div><div class=footer__cols__col__link><a href=/get-started/beam-overview/>Overview</a></div><div class=footer__cols__col__link><a href=/get-started/quickstart-java/>Quickstart (Java)</a></div><div class=footer__cols__col__link><a href=/get-started/quickstart-py/>Quickstart (Python)</a></div><div class=footer__cols__col__link><a href=/get-started/quickstart-go/>Quickstart (Go)</a></div><div class=footer__cols__col__link><a href=/get-started/downloads/>Downloads</a></div></div><div class=footer__cols__col><div class=footer__cols__col__title>Docs</div><div class=footer__cols__col__link><a href=/documentation/programming-guide/>Concepts</a></div><div class=footer__cols__col__link><a href=/documentation/pipelines/design-your-pipeline/>Pipelines</a></div><div class=footer__cols__col__link><a href=/documentation/runners/capability-matrix/>Runners</a></div></div><div class=footer__cols__col><div class=footer__cols__col__title>Community</div><div class=footer__cols__col__link><a href=/contribute/>Contribute</a></div><div class=footer__cols__col__link><a href=https://projects.apache.org/committee.html?beam target=_blank>Team<img src=/images/external-link-icon.png width=14 height=14 alt="External link."></a></div><div class=footer__cols__col__link><a href=/community/presentation-materials/>Media</a></div><div class=footer__cols__col__link><a href=/community/in-person/>Events/Meetups</a></div><div class=footer__cols__col__link><a href=/community/contact-us/>Contact Us</a></div></div><div class=footer__cols__col><div class=footer__cols__col__title>Resources</div><div class=footer__cols__col__link><a href=/blog/>Blog</a></div><div class=footer__cols__col__link><a href=https://github.com/apache/beam>GitHub</a></div></div></div><div class=footer__bottom>© |
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