2.1.8

This release brings a re-implemented ZSTM runtime that significantly improves performance under contention, enables multi-threading for Scala Native 0.5.x, squashes some minor bugs, and makes a few things run a little bit faster. And it is fully binary and source-compatible with the rest of 2.x release!

Highlights

ZSTM performance improvements

The performance of ZSTM under heavy contention has regressed over time due to various bug fixes. In this release, we reimplemented the internal runtime of ZSTM in order to significantly improve its performance under heavy contention (up to 800% improved throughput in some benchmarks!) all while achieving similar or better performance under no contention. For more details check out #9081

Scala Native multi-threading support

In the previous release, we updated Scala Native to v0.5.x but as we mentioned in the release notes, the ZIO runtime was not yet multi-threading capable. In this release, we threw most of the existing Scala Native code (which was not thread-safe) and changed it to use (mostly) the same code as the JVM artifacts. Users that currently use ZIO with Scala Native 0.5.x must enable multi-threading for Scala Native in their builds by removing nativeConfig ~= { _.withMultithreading(false) }.

Warning

We're aware of an issue when using zio-test on MacOS ARM64 when the debug compilation mode is used (default). If you come across any issues, try setting the mode to releaseFast or releaseFull (see here for an example)

What's Changed

• makeSome refactoring (#9077) @pablf
• Scala native multi-threading support (#9127) @kyri-petrou
• Config.Secret's length leak (#9129) @pablf
• send test finished notification for failing tests (#9139) @vincent-raman
• Whencasediscardfunctions (#9136) @Petter-K
• Optimise Secret creation from String (#9130) @guizmaii
• Fix Scala Native tests not being run/reported properly (#9126) @kyri-petrou
• FiberRuntime cleanups & micro-optimizations (#9115) @kyri-petrou
• Prefer Exit over ZIO in nested effects and other micro-optimizations (#9106) @kyri-petrou
• Optimize FiberRef#locally to restore previous FiberRefs when unmodified (#9105) @kyri-petrou
• Use an improved eq in FiberRefs and add shortcut for join (#9100) @kyri-petrou
• Add TestAspect.checks to allow running aspects within property-based specs (#9076) @mschuwalow
• Allow cached methods to be interrupted (#9068) @guymers
• Avoid scheduling non-positive sleep timers (#9098) @kyri-petrou
• Improve ZSTM's performance (#9081) @kyri-petrou
• Ensure ZStream scope is properly closed (#9088) @kyri-petrou
• fix: restore non-determinism in mapOutZIOParUnordered (#9075) @regiskuckaertz
• feat: accumulate errors in ZChannel.mapOutZIOPar (#9065) @regiskuckaertz
• Fix behaviour of ZEnvironment.empty.get[Any] (#9074) @kyri-petrou

Other changes (CI, dependencies and documentation)

• Fix checkout on release (#9142) @kyri-petrou
• STM Documentation: Improve Writing and Fix Grammar Mistakes (#9107) @khajavi
• fix(deps): update dependency @zio.dev/zio-redis to v1 (#9141) @renovate
• fix(deps): update dependency @zio.dev/zio-logging to v2.3.1 (#9140) @renovate
• fix(deps): update dependency @zio.dev/zio-kafka to v2.8.2 (#9137) @renovate
• fix(deps): update dependency @zio.dev/zio-telemetry to v3.0.0-rc26 (#9134) @renovate
• chore(deps): update dependency @types/react to v18.3.4 (#9133) @renovate
• fix(deps): update dependency @zio.dev/zio-kafka to v2.8.1 (#9132) @renovate
• Fix flaky ZStream test (#9121) @kyri-petrou
• Reduce CI test time & optimize zio-test execution (#9128) @kyri-petrou
• Add video component (#9111) @SvMak
• Fix typos and improve English in index.md (#9119) @nedmules-sked
• Setup improving website (#9110) @SvMak
• fix(deps): update dependency @zio.dev/zio-schema to v1.4.1 (#9114) @renovate
• fix(deps): update dependency @zio.dev/zio-schema to v1.4.0 (#9109) @renovate
• fix(deps): update dependency @zio.dev/zio-prelude to v1.0.0-rc29 (#9108) @renovate
• Ensure green CI with re-actors/alls-green (#9104) @sideeffffect
• fix(deps): update dependency @zio.dev/zio-json to v0.7.2 (#9103) @renovate
• Reduce number of CI workflows (#9096) @kyri-petrou
• fix(deps): update dependency @zio.dev/zio-optics to v0.2.2 (#9099) @renovate
• fix(deps): update dependency @zio.dev/zio-constraintless to v0.3.3 (#9097) @renovate
• Fix flaky WeakConcurrentBagSpec test (#9095) @kyri-petrou
• Fix TestClock (#9080) @asr2003
• add new ZIO template project to the list of template projects (#9094) @lachezar
• Fix flaky ZLayer test (#9092) @kyri-petrou
• chore(deps): update dependency cytoscape to v3.30.2 (#9085) @renovate
• fix(deps): update dependency @zio.dev/zio-prelude to v1.0.0-rc28 (#9083) @renovate
• fix(deps): update dependency @zio.dev/zio-telemetry to v3.0.0-rc25 (#9090) @renovate
• fix(deps): update dependency postcss to v8.4.41 (#9078) @renovate
• Typo in stream reference (#9064) @SADmitry
• docs: add clarification note on initialization of test bootstrap layers (#9057) @varshith257