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Report reason for cancellation of parallel task #1226

Open
feature
#2954
Open
Report reason for cancellation of parallel task#1226
feature
#2954
Labels
area: loopsChanges related to looping over tasks/commands.good first issueIssues that are good for first-time contributors to pick up.state: awaiting responseWaiting for issue author to respond.

Description

@aucampia
aucampia
opened on Jun 19, 2023

When two tasks run in parallel, and one fails, the other seems to be cancelled, but this cancellation is not reported explicitly.

It would be significantly clearer to users what is happening if the reason for cancellation was explicitly reported.

So for example, instead of (GitHub Actions output):

⯈lint:mypy
⯈CI:test
task: Failed to run task "CI:lint": task: Failed to run task "lint:mypy": exit status 1
Error: Process completed with exit code 201.

have

⯈lint:mypy
⯈CI:test
task: Terminated `CI:test` because parallel running task `CI:lint` failed.
task: Failed to run task "CI:lint": task: Failed to run task "lint:mypy": exit status 1
Error: Process completed with exit code 201.

Activity

  1. task-bot
    added
    state: needs triageWaiting to be triaged by a maintainer.
    on Jun 19, 2023
  2. trulede
    self-assigned this
    on Dec 8, 2025
  3. trulede
    removed their assignment
    on Feb 7, 2026

  4. trulede commented on Feb 8, 2026

    @trulede
    trulede
    on Feb 8, 2026
    Contributor

    Deps are run with:

    errgroup.WithContext(ctx)
g.Go(func() error {err := e.RunTask(......

    It might be possible to arrange something with

    context.AfterFunc(ctx, func() ....
containing
ctx.Err() // returns context.Canceled
context.Cause(ctx) // returns myError

  5. trulede commented on Mar 19, 2026

    @trulede
    trulede
    on Mar 19, 2026
    Contributor

    @aucampia A recent feature "failfast" has changed the behaviour here. When set false, parallel tasks will run to completion, even if a peer fails. You might like to try that.

    Solution note, save err for each task, check if errors.Is(err, contextCanceled) - in func (e *Executor) Run().

  6. trulede
    added
    good first issueIssues that are good for first-time contributors to pick up.
    state: awaiting reviewWaiting for a maintainer to review.
    area: loopsChanges related to looping over tasks/commands.
    state: awaiting responseWaiting for issue author to respond.
    and removed
    state: needs triageWaiting to be triaged by a maintainer.
    state: awaiting reviewWaiting for a maintainer to review.
    on Mar 19, 2026
  7. trulede
    added the
    feature
    issue type on Mar 19, 2026
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    area: loopsChanges related to looping over tasks/commands.good first issueIssues that are good for first-time contributors to pick up.state: awaiting responseWaiting for issue author to respond.

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