typelevel / typelevel/fs2

The return value of Topic#publish1 is lying when there's a race condition with Topic closure

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bug
Dominant language
Scala
Stars
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Forks
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Avg merge
2d 4h
Merged PRs (30d)
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Description

Whenever Topic#publish1 returns Right(()), all subscribers should receive the event. However, this is not the case when publish1 races with close.

PR with a failing test: #3645

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with Topic#publish1 and Topic#close, then inspect the failing test in PR #3645. Reproduce the race and verify that a successful Right(()) means every subscriber receives the event; done is the regression test passing without changing that success contract.

Written by the indexing model from the issue text.

Assessment

Tech stack
scala
Domain
stream-processing
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
45/100

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