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bb8

Full-featured async (tokio-based) connection pool (like r2d2)

0.9.1 34M downloads/mo #1558 most downloaded on crates.io djc/bb8

What this package is like to depend on

Last release 9 months ago

24 Nov 2025

Ships fairly regularly

a new release about every 7 months

Rarely documented

notes for 5 of 22 stable releases

Nothing withdrawn

no release was ever pulled

7 years old

22 releases · first in 2019

1 release in the last 12 months

see the full history below

Release timeline

22 releases · Mar 2019 to Nov 2025
2020 2021 2022 2023 2024 2025 2026
Release Pre-release

Releases

latest 22
  1. 0.9.1 24 Nov 2025
    Release notes

    Work on bb8 is currently underfunded. If your employer relies on this project (or any others I maintain) in production, consider sponsoring my work.

    What's Changed

    Open source →
  2. 0.9.0 09 Dec 2024
    Release notes

    bb8 0.9.0 (and bb8-postgres 0.9.0, bb8-redis 0.18.0) adopts RPITIT (first stabilized in Rust 1.75) to drop the dependency on async_trait. This comes at the cost of raising the MSRV for these new releases to 1.75. If any bugs are found, I will consider releasing 0.8.x upgrades until such time as Tokio bumps its MSRV to 1.75.

    What's Changed

    • Add Discord link to README by @djc in #228
    • Apply suggestions from clippy 1.83 by @djc in #229
    • Get token from environment by @djc in #231
    • Replace async_trait with native async fns by @gahag-cw in #230
    Open source →
  3. 0.8.6 17 Oct 2024
    Release notes

    What's Changed

    Please consider sponsoring ongoing maintenance or contact @djc to discuss commercial support.

    Open source →
  4. 0.8.5 14 Jun 2024
    Release notes

    What's Changed

    Open source →
  5. 0.8.4 14 Jun 2024
    Release notes

    What's Changed

    • Remove dependency on futures-channel in favour of tokio primitives by @aumetra in #191
    • Fix #167: Notify waiters when dropping a bad connection from the pool by @xortive in #194
    • Provide statistics for get operations by @pfreixes in #198
    • Add new get wait time statistic by @pfreixes in #203
    • Adds new statistics attributes for tracking connections closed by @pfreixes in #205
    • Adds new statistics attributes for reaped connections by @pfreixes in #206
    • Adds new connections_created statistic by @pfreixes in #207
    Open source →
  6. 0.8.3 01 Feb 2024

    Nothing published for this version

  7. 0.8.2 29 Jan 2024

    Nothing published for this version

  8. 0.8.1 31 May 2023

    Nothing published for this version

  9. 0.8.0 28 Mar 2022

    Nothing published for this version

  10. 0.7.1 11 Aug 2021

    Nothing published for this version

  11. 0.7.0 27 Dec 2020

    Nothing published for this version

  12. 0.6.2 22 Dec 2020

    Nothing published for this version

  13. 0.6.1 17 Nov 2020

    Nothing published for this version

  14. 0.6.0 16 Nov 2020

    Nothing published for this version

  15. 0.5.2 22 Dec 2020

    Nothing published for this version

  16. 0.5.1 17 Nov 2020

    Nothing published for this version

  17. 0.5.0 15 Nov 2020

    Nothing published for this version

  18. 0.4.2 21 Apr 2020

    Nothing published for this version

  19. 0.4.1 10 Apr 2020

    Nothing published for this version

  20. 0.4.0 17 Jan 2020

    Nothing published for this version

  21. 0.3.1 19 Jul 2019

    Nothing published for this version

  22. 0.3.0 17 Mar 2019

    Nothing published for this version

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