Enhance purge with parallel batch deletes and partial purge timeout by YunchuWang · Pull Request #1321 · Azure/durabletask

YunchuWang · 2026-03-18T19:24:47Z

Summary

Enhance the Azure Storage purge implementation with parallel batch deletes, CancellationToken-based partial purge timeout, improved error handling, and comprehensive tests.

Motivation

Purging large numbers of orchestration instances (100K+) with the current implementation causes:

Timeouts: Sequential batch deletes are too slow, causing gRPC deadline timeouts in isolated worker
Storage errors: DeleteBatchAsync fails with 404 when entities are already deleted (race condition)
Silent data loss: gRPC cancellation kills the response but not the in-flight storage operations — caller has no visibility into progress
No progress tracking: No way to know how many instances remain

Changes

Core (DurableTask.Core)

PurgeInstanceFilter.Timeout (TimeSpan?): Optional timeout for partial purge
PurgeResult.IsComplete (bool?): Already existed, now properly populated

Azure Storage (DurableTask.AzureStorage)

PurgeHistoryResult.IsComplete: New property + constructor overload, forwarded via ToCorePurgeHistoryResult()
AzureStorageOrchestrationService.PurgeInstanceHistoryAsync(..., TimeSpan timeout): New overload
AzureTableTrackingStore.DeleteHistoryAsync: CancellationToken-based timeout using linked CancellationTokenSource
Table.DeleteBatchParallelAsync: New parallel batch delete with concurrent transactions and 404 fallback
MessageManager.DeleteLargeMessageBlobs: Fixed 404 handling with try/catch instead of ExistsAsync + delete
Concurrency control: SemaphoreSlim(100) for instance-level parallelism

Behavior

When Timeout is set:

Creates a CancellationTokenSource(timeout) linked with the caller's CancellationToken
Passes the effective token to table queries, throttle waits, and ThrowIfCancellationRequested
On timeout: catches OperationCanceledException, waits for in-flight deletions, returns IsComplete = false
Already-dispatched instance deletions use effectiveToken and can be cancelled in flight when timeout
When Timeout is not set:
Existing behavior unchanged (IsComplete = null for backward compatibility)

Benchmark Results

100K Instances (EP1, separate ASPs/storage)

Metric	Baseline (stock)	Optimized	Delta
Total Deleted	28,702	99,949	3.5x
Purge Rate	48.7 inst/s	336.5 inst/s	6.9x
Errors	16	0	Error-free

500K Instances (EP1, isolated worker SDK path with 25s timeout)

Metric	Baseline (no timeout)	Optimized (25s timeout)	Delta
Reported Deleted	17,402 (3.5%)	499,560 (99.9%)	28.7x
Purge Rate	12.3 inst/s	318.1 inst/s	25.9x
Errors	41 (95%)	0	Error-free

Breaking Changes

None. All changes are additive:

New optional Timeout property on PurgeInstanceFilter
New constructor overload on PurgeHistoryResult
New PurgeInstanceHistoryAsync overload (original method unchanged)
Internal interface/base class changes are non-public

Tests Added

PartialPurge_TimesOutThenCompletesOnRetry
PartialPurge_GenerousTimeout_CompletesAll
PartialPurge_WithoutTimeout_ReturnsNullIsComplete
PurgeMultipleInstancesHistoryByTimePeriod_ScalabilityValidation
PurgeSingleInstanceWithIdempotency
PurgeSingleInstance_WithLargeBlobs_CleansUpBlobs
PurgeInstance_WithManyHistoryRows_DeletesAll
9 unit tests for DeleteBatchParallelAsync

Related PRs

…bill/enpurge

- Add TimeSpan? Timeout to PurgeInstanceFilter for partial purge support - Add bool? IsComplete to PurgeHistoryResult to indicate completion status - Add new PurgeInstanceHistoryAsync overload with TimeSpan timeout parameter - Use CancellationToken-based timeout (linked CTS) in DeleteHistoryAsync - Already-dispatched deletions complete before returning partial results - Backward compatible: no timeout = original behavior (IsComplete = null) - Forward IsComplete through ToCorePurgeHistoryResult to PurgeResult - Add scenario tests for partial purge timeout, generous timeout, and compat

- Always cap timeout to 30s max, even if not specified or exceeds 30s - Pass effectiveToken into DeleteAllDataForOrchestrationInstance so in-flight deletes are also cancelled on timeout - Catch OperationCanceledException from Task.WhenAll for timed-out in-flight deletes - External cancellationToken cancellation still propagates normally

src/DurableTask.AzureStorage/Tracking/AzureTableTrackingStore.cs

Copilot

Pull request overview

Improves purge scalability and robustness for DurableTask’s Azure Storage backend by adding parallelized table batch deletes, optional timeout-based partial purging, better 404/idempotency handling, and expanded test coverage.

Changes:

Add optional purge timeout (PurgeInstanceFilter.Timeout) and propagate completion status via IsComplete into core PurgeResult.
Implement parallel table batch deletion with 404 fallback to per-entity deletes.
Add scenario + unit tests for partial purge behavior, blob cleanup, and parallel batch delete behavior.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
test/DurableTask.AzureStorage.Tests/TestOrchestrationClient.cs	Adds helper API to invoke the new timed purge overload in tests.
test/DurableTask.AzureStorage.Tests/AzureStorageScenarioTests.cs	Adds new purge/partial-purge scenario tests and validation for large-message blob cleanup.
src/DurableTask.Core/PurgeInstanceFilter.cs	Introduces optional `Timeout` for partial purge.
src/DurableTask.AzureStorage/Tracking/TrackingStoreBase.cs	Extends purge-by-time signature to include an optional timeout.
src/DurableTask.AzureStorage/Tracking/ITrackingStore.cs	Extends tracking store purge API contract to include optional timeout.
src/DurableTask.AzureStorage/Tracking/AzureTableTrackingStore.cs	Implements timeout-aware, parallel purge-by-time behavior and uses parallel batch delete.
src/DurableTask.AzureStorage/Storage/Table.cs	Adds `DeleteBatchParallelAsync` with transactional chunking and 404 fallback.
src/DurableTask.AzureStorage/PurgeHistoryResult.cs	Adds `IsComplete` and forwards it to core `PurgeResult`.
src/DurableTask.AzureStorage/MessageManager.cs	Improves 404 handling for large-message blob deletion by relying on list/delete with exception handling.
src/DurableTask.AzureStorage/AzureStorageOrchestrationService.cs	Adds timed purge overload and wires `PurgeInstanceFilter.Timeout` into the call path.
Test/DurableTask.AzureStorage.Tests/Storage/TableDeleteBatchParallelTests.cs	Adds unit tests validating parallel batch delete chunking, fallback, and cancellation behavior.

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src/DurableTask.AzureStorage/Tracking/AzureTableTrackingStore.cs

src/DurableTask.AzureStorage/Storage/Table.cs

test/DurableTask.AzureStorage.Tests/AzureStorageScenarioTests.cs

src/DurableTask.AzureStorage/AzureStorageOrchestrationService.cs

src/DurableTask.AzureStorage/Tracking/AzureTableTrackingStore.cs

- Hard-code 30s CancellationToken-based timeout in DeleteHistoryAsync - Remove configurable Timeout from PurgeInstanceFilter (not needed) - Remove timeout overload from AzureStorageOrchestrationService - IsComplete = true when all purged within 30s, false when timed out - Callers loop until IsComplete = true for large-scale purge

src/DurableTask.AzureStorage/Tracking/AzureTableTrackingStore.cs

test/DurableTask.AzureStorage.Tests/AzureStorageScenarioTests.cs

- Add TimeSpan? Timeout property to PurgeInstanceFilter (opt-in, default null) - When null: unbounded purge, IsComplete=null (backward compat, no behavior change) - When set: CancellationToken-based timeout, IsComplete=true/false - Thread Timeout through IOrchestrationServicePurgeClient path - Zero breaking changes: existing callers unaffected

src/DurableTask.AzureStorage/Tracking/AzureTableTrackingStore.cs

Copilot

Pull request overview

This PR enhances the Azure Storage purge pipeline to improve throughput and reliability for large purges by introducing parallelized batch deletes, a timeout-driven partial purge mechanism, and forwarding completion status back to the core purge result shape.

Changes:

Added PurgeInstanceFilter.Timeout and plumbed timeout support into Azure Storage tracking-store purging.
Implemented Table.DeleteBatchParallelAsync with 404/idempotency fallback and updated purge to use it.
Added/updated purge-related tests and extended purge result types to carry IsComplete.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
test/DurableTask.AzureStorage.Tests/AzureStorageScenarioTests.cs	Adds new purge scenario tests for scalability/idempotency/large-blob cleanup and a test intended to validate completion semantics.
src/DurableTask.Core/PurgeInstanceFilter.cs	Adds `Timeout` option to the core purge filter contract.
src/DurableTask.AzureStorage/Tracking/TrackingStoreBase.cs	Extends time-range purge signature to accept optional `timeout`.
src/DurableTask.AzureStorage/Tracking/ITrackingStore.cs	Extends tracking store purge API with an optional `timeout` parameter.
src/DurableTask.AzureStorage/Tracking/AzureTableTrackingStore.cs	Implements timeout-aware, parallel instance purging and returns `IsComplete` based on timeout.
src/DurableTask.AzureStorage/Storage/Table.cs	Adds `DeleteBatchParallelAsync` with parallel transactions and 404 fallback to individual deletes.
src/DurableTask.AzureStorage/PurgeHistoryResult.cs	Adds `IsComplete` to AzureStorage purge result and forwards it to `DurableTask.Core.PurgeResult`.
src/DurableTask.AzureStorage/MessageManager.cs	Improves 404 handling for large message blob cleanup by relying on try/catch rather than container existence checks.
src/DurableTask.AzureStorage/AzureStorageOrchestrationService.cs	Wires `PurgeInstanceFilter.Timeout` into the tracking-store purge path used by `IOrchestrationServicePurgeClient`.
Test/DurableTask.AzureStorage.Tests/Storage/TableDeleteBatchParallelTests.cs	Adds unit tests for `DeleteBatchParallelAsync` (but currently placed outside the referenced test project directory).

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src/DurableTask.AzureStorage/Tracking/AzureTableTrackingStore.cs

src/DurableTask.Core/PurgeInstanceFilter.cs

test/DurableTask.AzureStorage.Tests/AzureStorageScenarioTests.cs

test/DurableTask.AzureStorage.Tests/Storage/TableDeleteBatchParallelTests.cs

- Update PurgeInstanceFilter.Timeout docs: in-flight deletions are cancelled (intentional) - Add using var for SemaphoreSlim disposal - Fix DateTime.Now/UtcNow mixing in purge tests (use UtcNow consistently) - Rename PurgeReturnsIsComplete test to match actual assertions - Move TableDeleteBatchParallelTests.cs from Test/ to test/ (correct project path) - Fix typos: grater->greater, status->statuses in XML docs - Use LINQ Select for foreach loop per code quality suggestion

Copilot

Pull request overview

This PR improves the Azure Storage purge pipeline to better handle large-scale instance purges by adding parallelized table batch deletes, introducing an optional timeout for partial purges, and improving idempotency around already-deleted storage artifacts. It also expands scenario/unit test coverage to validate the new purge behaviors and scalability characteristics.

Changes:

Add PurgeInstanceFilter.Timeout and propagate IsComplete via PurgeHistoryResult → PurgeResult.
Implement parallel table batch deletion with 404 fallback to per-entity deletes.
Update purge and blob cleanup implementations for better cancellation/timeout behavior and add comprehensive tests.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
test/DurableTask.AzureStorage.Tests/Storage/TableDeleteBatchParallelTests.cs	Adds unit tests validating new parallel batch delete behavior (including 404 fallback and cancellation).
test/DurableTask.AzureStorage.Tests/AzureStorageScenarioTests.cs	Adds end-to-end purge scenario tests and uses UTC timestamps for purge windows.
src/DurableTask.Core/PurgeInstanceFilter.cs	Introduces optional `Timeout` for partial purge semantics.
src/DurableTask.AzureStorage/Tracking/TrackingStoreBase.cs	Extends tracking store purge API shape to accept optional `timeout`.
src/DurableTask.AzureStorage/Tracking/ITrackingStore.cs	Updates tracking store interface to include optional `timeout` parameter.
src/DurableTask.AzureStorage/Tracking/AzureTableTrackingStore.cs	Implements timeout-linked cancellation + throttled parallel instance purges and uses parallel history row deletes.
src/DurableTask.AzureStorage/Storage/Table.cs	Adds `DeleteBatchParallelAsync` with concurrent chunk submission and 404 fallback behavior.
src/DurableTask.AzureStorage/PurgeHistoryResult.cs	Adds `IsComplete` and forwards completion to core `PurgeResult`.
src/DurableTask.AzureStorage/MessageManager.cs	Improves large-message blob deletion to handle missing containers via exception-based 404 handling.
src/DurableTask.AzureStorage/AzureStorageOrchestrationService.cs	Threads the new timeout value through purge calls and fixes doc typos.

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test/DurableTask.AzureStorage.Tests/Storage/TableDeleteBatchParallelTests.cs

src/DurableTask.AzureStorage/Tracking/AzureTableTrackingStore.cs

src/DurableTask.AzureStorage/Tracking/ITrackingStore.cs

src/DurableTask.AzureStorage/Storage/Table.cs

- PurgeHistoryResultTests: constructor IsComplete (true/false/null), ToCorePurgeHistoryResult propagation, backward compat - PurgeInstanceFilterTests: Timeout default null, set/reset, PurgeResult IsComplete tri-state, old constructor compat

- Remove unused using System.Collections.Concurrent (#1) - Pass original cancellationToken (not effectiveToken) to in-flight deletes (#3) - Update ITrackingStore doc to include Canceled status (#4) - Use wall-clock Stopwatch for DeleteBatchParallelAsync Elapsed (#5)

YunchuWang · 2026-03-20T04:05:01Z

Regarding the pendingTasks memory concern: With the new opt-in timeout feature (default 30s when used), the maximum number of pending tasks is naturally bounded by how many instances can be dispatched within the timeout window (~100 concurrent 30s a few thousand tasks at most). For the no-timeout path (backward compat), the existing behavior is preserved. The SemaphoreSlim(100) already limits actual concurrency. Switching to Parallel.ForEachAsync would be a larger refactor that changes the async enumeration pattern better suited for a follow-up.

Copilot

Pull request overview

Copilot reviewed 12 out of 12 changed files in this pull request and generated 3 comments.

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src/DurableTask.Core/PurgeInstanceFilter.cs

src/DurableTask.AzureStorage/Tracking/AzureTableTrackingStore.cs

src/DurableTask.AzureStorage/Storage/Table.cs

- Revert to effectiveToken so in-flight deletes are cancelled on timeout - Update PurgeInstanceFilter.Timeout XML doc to match behavior - Docs and comments now consistently say in-flight deletes are cancelled

Copilot · 2026-03-20T17:45:34Z

@YunchuWang I've opened a new pull request, #1325, to work on those changes. Once the pull request is ready, I'll request review from you.

Copilot

Pull request overview

Copilot reviewed 12 out of 12 changed files in this pull request and generated 6 comments.

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src/DurableTask.AzureStorage/Tracking/AzureTableTrackingStore.cs

src/DurableTask.AzureStorage/MessageManager.cs

src/DurableTask.AzureStorage/Storage/Table.cs

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Copilot

Pull request overview

Copilot reviewed 12 out of 12 changed files in this pull request and generated 2 comments.

Comments suppressed due to low confidence (1)

src/DurableTask.AzureStorage/MessageManager.cs:1

storageOperationCount no longer counts the list operation when blobs exist (it only counts deletes and only adds “1” when there are no blobs). If this value is used as “requests sent to storage,” it will undercount in the common case where blobs exist. Consider initializing to 1 before enumerating (to count the list) and then adding delete counts, or explicitly incrementing for the list call regardless of whether any blobs were found.

//  ----------------------------------------------------------------------------------

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src/DurableTask.AzureStorage/Storage/Table.cs

src/DurableTask.AzureStorage/Tracking/AzureTableTrackingStore.cs

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Copilot reviewed 12 out of 12 changed files in this pull request and generated 3 comments.

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src/DurableTask.AzureStorage/Tracking/AzureTableTrackingStore.cs

src/DurableTask.AzureStorage/Storage/Table.cs

test/DurableTask.AzureStorage.Tests/Storage/TableDeleteBatchParallelTests.cs

…deletion

… into wangbill/enpurge

…ding tests

test/DurableTask.AzureStorage.Tests/AzureStorageScenarioTests.cs

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test/DurableTask.Core.Tests/PurgeInstanceFilterTests.cs

test/DurableTask.AzureStorage.Tests/Storage/TableDeleteBatchParallelTests.cs

YunchuWang and others added 7 commits March 13, 2026 15:33

enhance purge

26734db

Merge branch 'main' of https://github.com/Azure/durabletask into wang…

ee9812f

…bill/enpurge

revert timestamp change

8a886b4

Refactor purge functionality and add tests for large message cleanup

db2cb4d

remove semaphore

1603320

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Add partial purge timeout support in gRPC proto mapping Azure/azure-functions-durable-extension#3398

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Add opt-in Timeout to PurgeInstancesFilter for partial purge microsoft/durabletask-dotnet#680

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YunchuWang added 2 commits March 19, 2026 17:14

Merge branch 'main' into wangbill/enpurge

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Use effectiveToken for in-flight deletes and align docs

dcc69c4

- Revert to effectiveToken so in-flight deletes are cancelled on timeout - Update PurgeInstanceFilter.Timeout XML doc to match behavior - Docs and comments now consistently say in-flight deletes are cancelled

Merge branch 'main' into wangbill/enpurge

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Remove unused using System.Collections.Concurrent from TableDeleteBatchParallelTests #1325

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Update src/DurableTask.AzureStorage/Tracking/AzureTableTrackingStore.cs

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Potential fix for pull request finding 'Constant condition'

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Merge branch 'main' into wangbill/enpurge

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YunchuWang added 3 commits March 20, 2026 11:53

Refactor deletion logic to use a dedicated async method for instance …

6ea7372

…deletion

Merge branch 'wangbill/enpurge' of https://github.com/Azure/durabletask…

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… into wangbill/enpurge

Add purge instance history method with optional timeout and correspon…

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…ding tests

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Summary

Motivation

Changes

Core (DurableTask.Core)

Azure Storage (DurableTask.AzureStorage)

Behavior

Benchmark Results

100K Instances (EP1, separate ASPs/storage)

500K Instances (EP1, isolated worker SDK path with 25s timeout)

Breaking Changes

Tests Added

Related PRs

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YunchuWang commented Mar 18, 2026 •

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