Issues

• Feature Proposal: report progress writing to sockets

  typelevel/fs2#3773 · Filter by author reardonj opened on Oct 1, 2026

• fs2-io is not closing ports when a DatagramChannel is used

  bug
  typelevel/fs2#3762 · Filter by author markehammons opened on Sep 3, 2026
  4

• TCP connection pool design advice

  typelevel/fs2#3719 · Filter by author Tanmay-008 opened on May 1, 2026
  2

• Make chunk sizes configurable for ProcessBuilder

  typelevel/fs2#3701 · Filter by author ddtthh opened on Mar 19, 2026

• Stream.merge hangs when one branch is empty + repeat, unresponsive to interruptAfter and IO.cancel

  bug
  typelevel/fs2#3697 · Filter by author TalkingFoxMid opened on Mar 16, 2026
  1

• Process[IO] that spawns child processes might not respect cancellation

  bug
  typelevel/fs2#3693 · Filter by author fredshonorio opened on Mar 10, 2026
  1

• Extensible Process Control API (pid and Signals)

  typelevel/fs2#3682 · Filter by author guptapratykshh opened on Feb 20, 2026

• Files[IO].writeAll creates file when it shouldn't

  bug
  typelevel/fs2#3667 · Filter by author nikiforo opened on Jan 19, 2026
  1

• .conflateChunks does not respect the provided chunk limit

  bug
  typelevel/fs2#3661 · Filter by author domaspoliakas opened on Jan 12, 2026
  2

• 3.13.0-M8 Stream.pauseWhen changed behavior when using mergeHaltL

  typelevel/fs2#3655 · Filter by author fede0664 opened on Jan 7, 2026
  4

• Get access to the socket file descriptor or generalise getOption to gain access to SO_ORIGINAL_DST in scala native

  bug
  typelevel/fs2#3653 · Filter by author rreckel opened on Jan 2, 2026
  2

• Topic subscribers observe different order of messages on concurrent publishers

  bug
  typelevel/fs2#3646 · Filter by author TomasMikula opened on Dec 9, 2025

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

  bug
  typelevel/fs2#3644 · Filter by author TomasMikula opened on Dec 9, 2025

• Emit a last stream on cancel

  typelevel/fs2#3636 · Filter by author crakjie opened on Nov 14, 2025

• Create another version of groupWithin() which won't create a singleton chunk when elements are available in bulk after being idle for a long time

  typelevel/fs2#3608 · Filter by author chenjianjx opened on Sep 12, 2025

• Unexpected behavior of onFinalize behavior

  bug
  typelevel/fs2#3607 · Filter by author wookievx opened on Sep 9, 2025
  4

• Add support for QUIC to fs2.io.net

  Feature

  typelevel/fs2#3605 · Filter by author mpilquist opened on Sep 6, 2025

• Test http4s servers fail release bound port on shutdown when using fs2 3.12.0

  bug
  typelevel/fs2#3590 · Filter by author mtomko opened on Aug 21, 2025
  5

• hold1 + concurrently releases bracket immediately

  bug
  typelevel/fs2#3567 · Filter by author morgen-peschke opened on May 7, 2025

• fs2.interop.flow.PublisherToSubscriberSpec.should cancel upstream if downstream completes flake

  bug
  typelevel/fs2#3542 · Filter by author armanbilge opened on Mar 7, 2025
  2

• fs2.interop.flow.PublisherToSubscriberSpec.should have the same output as input timeout

  bug
  typelevel/fs2#3541 · Filter by author armanbilge opened on Mar 7, 2025

• fs2 gunzip doesn't support concatenated gzip files

  bug
  typelevel/fs2#3503 · Filter by author dimitriho opened on Nov 19, 2024

• Stream hangs on error with broadcastThrough and readOutputStream

  bug
  typelevel/fs2#3502 · Filter by author dimitriho opened on Nov 19, 2024

• parEvalMap resets stream cancellation

  bug
  typelevel/fs2#3487 · Filter by author enlait opened on Oct 1, 2024
  1

• parEvalMap and it's variations hang on canceled effect

  bug
  typelevel/fs2#3486 · Filter by author enlait opened on Oct 1, 2024
  1