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kotlinx.coroutines v0.30.0 Release Notes

    • [Major] Further improvements in exception handling — no failure exception is lost.
      • async and async-like builders cancel parent on failure (it affects CompletableDeferred, and all reactive integration builders).
      • This makes parallel decomposition exception-safe and reliable without having to rember about awaitAll (see #552).
      • Job() wih parent now also cancels parent on failure consistently with other scopes.
      • All coroutine builders and Job implementations propagate failure to the parent unless it is a CancellationException.
      • Note, "scoping" builders don't "cancel the parent" verbatim, but rethrow the corresponding exception to the caller for handling.
      • SupervisorJob() and supervisorScope { ... } are introduced, allowing for a flexible implementation of custom exception-handling policies, see a [new section in the guide on supervision](docs/topics/exception-handling.md#supervision).
      • Got rid of awaitAll in documentation and rewrote currentScope section (see #624).
    • [Major] Coroutine scheduler is used for Dispatchers.Default by default instead of deprecated CommonPool.
      • "DefaultDispatcher" is used as a public name of the default impl (you'll see it thread names and in the guide).
      • -Dkotlinx.coroutines.scheduler=off can be used to switch back to CommonPool for a time being (until deprecated CommonPool is removed).
    • 👀 Make CoroutineStart.ATOMIC experimental as it covers important use-case with resource cleanup in finally block (see #627).
    • 👀 Restored binary compatibility of Executor.asCoroutineDispatcher (see #629).
    • 🛠 Fixed OOM in thread-pool dispatchers (see #571).
    • 👀 Check for cancellation when starting coroutine with Dispatchers.Unconfined (see #621).
    • 🐎 A bunch of various performance optimizations and docs fixes, including contributions from @AlexanderPrendota, @PaulWoitaschek.