Add ParallelAsync for concurrent branch execution (DOTNET-8662)#2375
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| ENTRYPOINT ["/var/task/bootstrap"] |
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Adds parallel branch execution to the .NET Durable Execution SDK.
ParallelAsync runs N branches concurrently with configurable concurrency
limits and completion policies, returning an IBatchResult<T> with
per-branch status and error information.
Public surface:
- IDurableContext.ParallelAsync<T> (4 overloads: reflection x 2 for
Func[] vs DurableBranch<T>[]; AOT-safe x 2 same)
- DurableBranch<T> record (Name + Func)
- ParallelConfig (MaxConcurrency, CompletionConfig, NestingType)
- CompletionConfig with factories AllSuccessful() / FirstSuccessful() /
AllCompleted(); ToleratedFailureCount / ToleratedFailurePercentage
(validated 0.0-1.0)
- IBatchResult<T> with All / Succeeded / Failed / Started accessors,
GetResults, GetErrors, ThrowIfError, HasFailure, CompletionReason,
count properties
- IBatchItem<T> with Index, Name, Status, Result, Error
- BatchItemStatus { Succeeded, Failed, Started }
- CompletionReason { AllCompleted, MinSuccessfulReached,
FailureToleranceExceeded }
- NestingType (Nested default; Flat throws NotSupportedException - reserved)
- ParallelException (carries IBatchResult; future-subclassable)
Internal:
- ParallelOperation<T> orchestrator dispatches branches with optional
semaphore-bounded concurrency. Each branch runs as a
ChildContextOperation<T> with deterministic ID via
OperationIdGenerator.CreateChild.
- Branch failures aggregated as IBatchItem<T> entries; orchestrator
throws ParallelException only when CompletionConfig signals
FailureToleranceExceeded.
- Parent CONTEXT checkpoint records summary (CompletionReason +
per-branch index/name/status); branch results live on per-branch
CONTEXT checkpoints.
- ExecutionState now thread-safe (lock around reads/writes of
_operations, _visitedOperations, _isReplaying). Required for
concurrent branch replay; affects all operations but no regressions.
- ParallelOperation awaits Task.WhenAll(inFlight) before disposing
the semaphore so cancellation/exception during dispatch lets
in-flight branches settle cleanly.
- Reuses OperationSubTypes.Parallel / OperationSubTypes.ParallelBranch
from Wave 0.
Adds 33 unit tests + 6 integration tests covering CompletionConfig
matrix, MaxConcurrency, FirstSuccessful short-circuit, replay
determinism, mixed-status replay, cancellation, and concurrency
stress.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
Adds parallel branch execution to the .NET Durable Execution SDK.
ParallelAsyncruns N branches concurrently with configurable concurrency limits and completion policies, returning anIBatchResult<T>with per-branch status and error information.Stacked on top of #2372 (Wave 0 cross-cutting types).
Fixes DOTNET-8662.
The shared
IBatchResult<T>family added here will be reused by MapAsync (Wave 2).Public surface
IDurableContext.ParallelAsync<T>(4 overloads: reflection × 2 forFunc[]vsDurableBranch<T>[]; AOT-safe × 2 same)DurableBranch<T>record (Name + Func)ParallelConfig(MaxConcurrency, CompletionConfig, NestingType)CompletionConfigwith factoriesAllSuccessful()/FirstSuccessful()/AllCompleted();ToleratedFailureCount/ToleratedFailurePercentage(validated 0.0–1.0)IBatchResult<T>withAll/Succeeded/Failed/Startedaccessors,GetResults,GetErrors,ThrowIfError,HasFailure,CompletionReason, count propertiesIBatchItem<T>withIndex,Name,Status,Result,ErrorBatchItemStatus { Succeeded, Failed, Started }CompletionReason { AllCompleted, MinSuccessfulReached, FailureToleranceExceeded }NestingType(Nested default; Flat throwsNotSupportedException— reserved for a follow-up)ParallelException(carriesIBatchResult; future-subclassable)Internal
ParallelOperation<T>orchestrator dispatches branches with optional semaphore-bounded concurrency. Each branch runs as aChildContextOperation<T>with a deterministic ID viaOperationIdGenerator.CreateChild.IBatchItem<T>entries; orchestrator throwsParallelExceptiononly whenCompletionConfigsignalsFailureToleranceExceeded.ExecutionStatenow thread-safe (lock around reads/writes of_operations,_visitedOperations,_isReplaying). Required for concurrent branch replay; affects all operations but no regressions.ParallelOperationawaitsTask.WhenAll(inFlight)before disposing the semaphore so cancellation/exception during dispatch lets in-flight branches settle cleanly.OperationSubTypes.Parallel/OperationSubTypes.ParallelBranchfrom Wave 0.Test plan
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