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ci: concurrency group is keyed on the branch name, so same-named fork branches can cancel each other's CI

オープン 初心者向け
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評価

難易度
2/5
見積もり時間
1〜3時間
初心者へのやさしさ
78/100
issue の種類
バグ
明瞭さ
明確に書かれている
活発さ
活発
技術スタック
github-actions, yaml
領域
ci-cd

調査の方向性

ci.ymlを読み、実行をすでにpull request番号で識別しているlabel_prs.ymlのconcurrency groupと比較します。codeql.yml、miri.yml、pr_title_check.ymlでも同じパターンを確認し、次にdev/ci/check-ci-config.pyで該当するCI設定テストを調べます。各pull requestに個別のgroupが割り当てられ、既存のfallbackが引き続き機能し、テストが同じ名前のforkブランチを2つ対象にすれば完了です。

索引モデルが issue の本文から書いたものです。

説明

area:ci bug priority:low requires-triage

Describe the bug

ci.yml cancels in-flight runs per concurrency group, and the group for a pull request is built from github.head_ref, which is the branch name alone, with no repository or PR number:

concurrency:
  group: ${{ github.repository }}-${{ github.head_ref || github.sha }}-${{ github.workflow }}-${{ github.event.action == 'labeled' && github.event.label.name || github.event_name }}
  cancel-in-progress: true

github.repository here is apache/datafusion-comet for every pull request, so two open pull requests from different forks whose branches share a name land in the same group. A push to one cancels the other's in-flight run, and the cancelled pull request shows a cancelled Required Checks until someone re-runs it.

Nearly every pull request comes from a fork (194 of the 198 open ones on 2026-10-28), and contributors often use a generic branch name such as main, patch-1 or fix, so a collision does not need unusual bad luck.

codeql.yml, miri.yml and pr_title_check.yml build their group the same way. label_prs.yml already keys on github.event.pull_request.number, which is the shape to copy.

To Reproduce

Not reproduced on a real pull request. I found no cancelled run caused by this in the roughly 1,500 most recent pull requests. The nearest case is two pull requests from different forks that both used the branch fix/park-native-scan-loop and were open together for about five minutes on 2026-09-25 (#6092 and #6219), with no run in flight on the first when the second started. The behaviour follows from how the group is built, and the GitHub documentation for concurrency is explicit that a new run in a group cancels the one in progress.

To reproduce: open two pull requests from different forks with the same branch name, push to both within a run's duration, and watch the first run end cancelled.

Expected behavior

A push to one pull request cancels only that pull request's earlier run.

Additional context

Keying on the pull request number fixes it for pull request events, with the existing fallbacks for the others:

group: ${{ github.repository }}-${{ github.event.pull_request.number || github.sha }}-${{ github.workflow }}-...

ci_label.yml calls ci.yml, and the pull_request context is the same in the called workflow, so label runs keep a stable key too. arrow-rs made the same change in apache/arrow-rs#11788, with a test that two pull requests with the same branch name get different groups. dev/ci/check-ci-config.py is the place to pin it.

主要言語
Scala
スター
1.3k
フォーク
398
平均マージ
2日 21時間
マージ済み PR(30日)
329

環境構築

はじめの一歩

  1. issue を最後まで読み、次にプロジェクトのコントリビューションガイドを読みます。
  2. 着手することを issue にコメントします — 二人が同じ作業をするのを防げます。
  3. リポジトリをフォークし、ブランチを切って変更します。
  4. issue 番号を参照したプルリクエストを送ります。

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