This is going to be 1. writing a cancel_all task 2. wiring cancel_all and retrigger into the treeherder ui buttons that perform those actions currently.

Comment on attachment 8915739 [details] Bug 1405740 - Add a cancel-all action task https://reviewboard.mozilla.org/r/186942/#review192010 ::: taskcluster/taskgraph/actions/cancel_all.py:47 (Diff revision 1) > +def cancel_all_action(parameters, input, task_group_id, task_id, task): > + session = get_session() > + own_task_id = os.environ.get('TASK_ID', '') > + for task in list_group(task_group_id, session): > + if task != own_task_id: > + cancel_task(task, use_proxy=True) To make this fast I would suggest adding some concurrency like in: https://dxr.mozilla.org/mozilla-central/rev/c97190c389c4cfef20fe55b4bacade95a36ae6ef/taskcluster/taskgraph/create.py#67-104 Something like: ```py with futures.ThreadPoolExecutor(CONCURRENCY) as e: cancels_jobs = [ e.submit(cancel_task, task_id, use_proxy=True) for task_id in list_group(task_group_id, session) if task_id != own_task_id ] for job in cancels_jobs: job.result() ```

This doesn't meet the review requirements needed for Autoland to push it. http://mozilla-version-control-tools.readthedocs.io/en/latest/mozreview/autoland.html#landing-commits

Comment on attachment 8915739 [details] Bug 1405740 - Add a cancel-all action task https://reviewboard.mozilla.org/r/186942/#review192384

Pushed by garndt@mozilla.com: https://hg.mozilla.org/integration/autoland/rev/bfcdeca9c054 Add a cancel-all action task r=garndt,jonasfj