feat: task superseding with atomic cancel-and-replace#32
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Add DuplicateStrategy enum (Skip, Supersede, Reject) to control what happens when submitting a task whose dedup key already exists. - Supersede pending/paused tasks with in-place row update (keeps queue position), supersede running/waiting tasks with DELETE + INSERT - Record old task in history as HistoryStatus::Superseded - Fire on_cancel hooks and cascade-cancel children of superseded running tasks (reuses PR 1's cancellation machinery) - Emit SchedulerEvent::Superseded for UI integration - Add on_duplicate() to TaskSubmission builder and TypedTask trait - Extend SubmitOutcome with Superseded and Rejected variants - Add 6 new tests: reject, pending supersede, running supersede, event emission, batch supersede, chain of supersedes Closes #15
- Add cancellation and superseding to crate feature list - Update lifecycle diagram to show cancelled/superseded paths - Expand dedup section to document DuplicateStrategy options - Add Cancellation concept section with on_cancel hook docs - Add Common patterns examples for cancellation and superseding - Update task, scheduler, and store module-level docs - Mark plan as implemented with PR references
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Mar 18, 2026
## 🤖 New release
* `taskmill`: 0.3.1 -> 0.4.0 (⚠ API breaking changes)
### ⚠ `taskmill` breaking changes
```text
--- failure constructible_struct_adds_field: externally-constructible struct adds field ---
Description:
A pub struct constructible with a struct literal has a new pub field. Existing struct literals must be updated to include the new field.
ref: https://doc.rust-lang.org/reference/expressions/struct-expr.html
impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.46.0/src/lints/constructible_struct_adds_field.ron
Failed in:
field TaskHistoryRecord.expected_io in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:290
field TaskHistoryRecord.actual_io in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:292
field TaskHistoryRecord.ttl_seconds in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:306
field TaskHistoryRecord.ttl_from in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:308
field TaskHistoryRecord.expires_at in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:310
field TaskHistoryRecord.run_after in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:312
field TaskHistoryRecord.tags in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:314
field TaskHistoryRecord.max_retries in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:316
field TaskHistoryRecord.expected_io in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:290
field TaskHistoryRecord.actual_io in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:292
field TaskHistoryRecord.ttl_seconds in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:306
field TaskHistoryRecord.ttl_from in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:308
field TaskHistoryRecord.expires_at in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:310
field TaskHistoryRecord.run_after in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:312
field TaskHistoryRecord.tags in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:314
field TaskHistoryRecord.max_retries in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:316
field TaskError.cancelled in /tmp/.tmp9SeJRW/taskmill/src/task/error.rs:28
field TaskError.retry_after_ms in /tmp/.tmp9SeJRW/taskmill/src/task/error.rs:33
field TaskError.cancelled in /tmp/.tmp9SeJRW/taskmill/src/task/error.rs:28
field TaskError.retry_after_ms in /tmp/.tmp9SeJRW/taskmill/src/task/error.rs:33
field EstimatedProgress.header in /tmp/.tmp9SeJRW/taskmill/src/scheduler/progress.rs:299
field EstimatedProgress.header in /tmp/.tmp9SeJRW/taskmill/src/scheduler/progress.rs:299
field EstimatedProgress.header in /tmp/.tmp9SeJRW/taskmill/src/scheduler/progress.rs:299
field SchedulerSnapshot.byte_progress in /tmp/.tmp9SeJRW/taskmill/src/scheduler/event.rs:45
field SchedulerSnapshot.recurring_schedules in /tmp/.tmp9SeJRW/taskmill/src/scheduler/event.rs:49
field SchedulerSnapshot.blocked_count in /tmp/.tmp9SeJRW/taskmill/src/scheduler/event.rs:51
field SchedulerSnapshot.byte_progress in /tmp/.tmp9SeJRW/taskmill/src/scheduler/event.rs:45
field SchedulerSnapshot.recurring_schedules in /tmp/.tmp9SeJRW/taskmill/src/scheduler/event.rs:49
field SchedulerSnapshot.blocked_count in /tmp/.tmp9SeJRW/taskmill/src/scheduler/event.rs:51
field TaskSubmission.expected_io in /tmp/.tmp9SeJRW/taskmill/src/task/submission.rs:382
field TaskSubmission.on_duplicate in /tmp/.tmp9SeJRW/taskmill/src/task/submission.rs:399
field TaskSubmission.ttl in /tmp/.tmp9SeJRW/taskmill/src/task/submission.rs:403
field TaskSubmission.ttl_from in /tmp/.tmp9SeJRW/taskmill/src/task/submission.rs:406
field TaskSubmission.run_after in /tmp/.tmp9SeJRW/taskmill/src/task/submission.rs:413
field TaskSubmission.recurring in /tmp/.tmp9SeJRW/taskmill/src/task/submission.rs:416
field TaskSubmission.dependencies in /tmp/.tmp9SeJRW/taskmill/src/task/submission.rs:419
field TaskSubmission.on_dependency_failure in /tmp/.tmp9SeJRW/taskmill/src/task/submission.rs:422
field TaskSubmission.tags in /tmp/.tmp9SeJRW/taskmill/src/task/submission.rs:427
field TaskSubmission.max_retries in /tmp/.tmp9SeJRW/taskmill/src/task/submission.rs:432
field TaskSubmission.expected_io in /tmp/.tmp9SeJRW/taskmill/src/task/submission.rs:382
field TaskSubmission.on_duplicate in /tmp/.tmp9SeJRW/taskmill/src/task/submission.rs:399
field TaskSubmission.ttl in /tmp/.tmp9SeJRW/taskmill/src/task/submission.rs:403
field TaskSubmission.ttl_from in /tmp/.tmp9SeJRW/taskmill/src/task/submission.rs:406
field TaskSubmission.run_after in /tmp/.tmp9SeJRW/taskmill/src/task/submission.rs:413
field TaskSubmission.recurring in /tmp/.tmp9SeJRW/taskmill/src/task/submission.rs:416
field TaskSubmission.dependencies in /tmp/.tmp9SeJRW/taskmill/src/task/submission.rs:419
field TaskSubmission.on_dependency_failure in /tmp/.tmp9SeJRW/taskmill/src/task/submission.rs:422
field TaskSubmission.tags in /tmp/.tmp9SeJRW/taskmill/src/task/submission.rs:427
field TaskSubmission.max_retries in /tmp/.tmp9SeJRW/taskmill/src/task/submission.rs:432
field SchedulerConfig.progress_interval in /tmp/.tmp9SeJRW/taskmill/src/scheduler/event.rs:252
field SchedulerConfig.cancel_hook_timeout in /tmp/.tmp9SeJRW/taskmill/src/scheduler/event.rs:256
field SchedulerConfig.default_ttl in /tmp/.tmp9SeJRW/taskmill/src/scheduler/event.rs:259
field SchedulerConfig.expiry_sweep_interval in /tmp/.tmp9SeJRW/taskmill/src/scheduler/event.rs:262
field SchedulerConfig.progress_interval in /tmp/.tmp9SeJRW/taskmill/src/scheduler/event.rs:252
field SchedulerConfig.cancel_hook_timeout in /tmp/.tmp9SeJRW/taskmill/src/scheduler/event.rs:256
field SchedulerConfig.default_ttl in /tmp/.tmp9SeJRW/taskmill/src/scheduler/event.rs:259
field SchedulerConfig.expiry_sweep_interval in /tmp/.tmp9SeJRW/taskmill/src/scheduler/event.rs:262
field TaskRecord.expected_io in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:202
field TaskRecord.ttl_seconds in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:219
field TaskRecord.ttl_from in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:221
field TaskRecord.expires_at in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:223
field TaskRecord.run_after in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:226
field TaskRecord.recurring_interval_secs in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:228
field TaskRecord.recurring_max_executions in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:230
field TaskRecord.recurring_execution_count in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:232
field TaskRecord.recurring_paused in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:234
field TaskRecord.dependencies in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:237
field TaskRecord.on_dependency_failure in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:239
field TaskRecord.tags in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:241
field TaskRecord.max_retries in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:245
field TaskRecord.expected_io in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:202
field TaskRecord.ttl_seconds in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:219
field TaskRecord.ttl_from in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:221
field TaskRecord.expires_at in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:223
field TaskRecord.run_after in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:226
field TaskRecord.recurring_interval_secs in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:228
field TaskRecord.recurring_max_executions in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:230
field TaskRecord.recurring_execution_count in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:232
field TaskRecord.recurring_paused in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:234
field TaskRecord.dependencies in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:237
field TaskRecord.on_dependency_failure in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:239
field TaskRecord.tags in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:241
field TaskRecord.max_retries in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:245
--- failure constructible_struct_adds_private_field: struct no longer constructible due to new private field ---
Description:
A struct constructible with a struct literal has a new non-public field. It can no longer be constructed using a struct literal outside of its crate.
ref: https://doc.rust-lang.org/reference/expressions/struct-expr.html
impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.46.0/src/lints/constructible_struct_adds_private_field.ron
Failed in:
field TaskSubmission.payload_error in /tmp/.tmp9SeJRW/taskmill/src/task/submission.rs:410
field TaskSubmission.payload_error in /tmp/.tmp9SeJRW/taskmill/src/task/submission.rs:410
--- failure enum_struct_variant_changed_kind: An enum struct variant changed kind ---
Description:
A pub enum's struct variant with at least one pub field has changed to a different kind of enum variant, breaking access to its pub fields.
ref: https://doc.rust-lang.org/reference/items/enumerations.html
impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.46.0/src/lints/enum_struct_variant_changed_kind.ron
Failed in:
variant SchedulerEvent::Dispatched in /tmp/.tmp9SeJRW/taskmill/src/scheduler/event.rs:85
variant SchedulerEvent::Completed in /tmp/.tmp9SeJRW/taskmill/src/scheduler/event.rs:87
variant SchedulerEvent::Preempted in /tmp/.tmp9SeJRW/taskmill/src/scheduler/event.rs:98
variant SchedulerEvent::Cancelled in /tmp/.tmp9SeJRW/taskmill/src/scheduler/event.rs:100
variant SchedulerEvent::Dispatched in /tmp/.tmp9SeJRW/taskmill/src/scheduler/event.rs:85
variant SchedulerEvent::Completed in /tmp/.tmp9SeJRW/taskmill/src/scheduler/event.rs:87
variant SchedulerEvent::Preempted in /tmp/.tmp9SeJRW/taskmill/src/scheduler/event.rs:98
variant SchedulerEvent::Cancelled in /tmp/.tmp9SeJRW/taskmill/src/scheduler/event.rs:100
--- failure enum_struct_variant_field_added: pub enum struct variant field added ---
Description:
An enum's exhaustive struct variant has a new field, which has to be included when constructing or matching on this variant.
ref: https://doc.rust-lang.org/reference/attributes/type_system.html#the-non_exhaustive-attribute
impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.46.0/src/lints/enum_struct_variant_field_added.ron
Failed in:
field header of variant SchedulerEvent::Failed in /tmp/.tmp9SeJRW/taskmill/src/scheduler/event.rs:90
field retry_after of variant SchedulerEvent::Failed in /tmp/.tmp9SeJRW/taskmill/src/scheduler/event.rs:95
field header of variant SchedulerEvent::Progress in /tmp/.tmp9SeJRW/taskmill/src/scheduler/event.rs:110
field header of variant SchedulerEvent::Failed in /tmp/.tmp9SeJRW/taskmill/src/scheduler/event.rs:90
field retry_after of variant SchedulerEvent::Failed in /tmp/.tmp9SeJRW/taskmill/src/scheduler/event.rs:95
field header of variant SchedulerEvent::Progress in /tmp/.tmp9SeJRW/taskmill/src/scheduler/event.rs:110
--- failure enum_struct_variant_field_missing: pub enum struct variant's field removed or renamed ---
Description:
A publicly-visible enum has a struct variant whose field is no longer available under its prior name. It may have been renamed or removed entirely.
ref: https://doc.rust-lang.org/cargo/reference/semver.html#item-remove
impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.46.0/src/lints/enum_struct_variant_field_missing.ron
Failed in:
field task_id of variant SchedulerEvent::Failed, previously in file /tmp/.tmptg1HQQ/taskmill/src/scheduler/event.rs:63
field task_type of variant SchedulerEvent::Failed, previously in file /tmp/.tmptg1HQQ/taskmill/src/scheduler/event.rs:64
field key of variant SchedulerEvent::Failed, previously in file /tmp/.tmptg1HQQ/taskmill/src/scheduler/event.rs:65
field label of variant SchedulerEvent::Failed, previously in file /tmp/.tmptg1HQQ/taskmill/src/scheduler/event.rs:66
field task_id of variant SchedulerEvent::Progress, previously in file /tmp/.tmptg1HQQ/taskmill/src/scheduler/event.rs:86
field task_type of variant SchedulerEvent::Progress, previously in file /tmp/.tmptg1HQQ/taskmill/src/scheduler/event.rs:87
field key of variant SchedulerEvent::Progress, previously in file /tmp/.tmptg1HQQ/taskmill/src/scheduler/event.rs:88
field label of variant SchedulerEvent::Progress, previously in file /tmp/.tmptg1HQQ/taskmill/src/scheduler/event.rs:89
field task_id of variant SchedulerEvent::Failed, previously in file /tmp/.tmptg1HQQ/taskmill/src/scheduler/event.rs:63
field task_type of variant SchedulerEvent::Failed, previously in file /tmp/.tmptg1HQQ/taskmill/src/scheduler/event.rs:64
field key of variant SchedulerEvent::Failed, previously in file /tmp/.tmptg1HQQ/taskmill/src/scheduler/event.rs:65
field label of variant SchedulerEvent::Failed, previously in file /tmp/.tmptg1HQQ/taskmill/src/scheduler/event.rs:66
field task_id of variant SchedulerEvent::Progress, previously in file /tmp/.tmptg1HQQ/taskmill/src/scheduler/event.rs:86
field task_type of variant SchedulerEvent::Progress, previously in file /tmp/.tmptg1HQQ/taskmill/src/scheduler/event.rs:87
field key of variant SchedulerEvent::Progress, previously in file /tmp/.tmptg1HQQ/taskmill/src/scheduler/event.rs:88
field label of variant SchedulerEvent::Progress, previously in file /tmp/.tmptg1HQQ/taskmill/src/scheduler/event.rs:89
--- failure enum_variant_added: enum variant added on exhaustive enum ---
Description:
A publicly-visible enum without #[non_exhaustive] has a new variant.
ref: https://doc.rust-lang.org/cargo/reference/semver.html#enum-variant-new
impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.46.0/src/lints/enum_variant_added.ron
Failed in:
variant StoreError:InvalidDependency in /tmp/.tmp9SeJRW/taskmill/src/store/mod.rs:54
variant StoreError:DependencyFailed in /tmp/.tmp9SeJRW/taskmill/src/store/mod.rs:56
variant StoreError:CyclicDependency in /tmp/.tmp9SeJRW/taskmill/src/store/mod.rs:58
variant StoreError:InvalidTag in /tmp/.tmp9SeJRW/taskmill/src/store/mod.rs:60
variant StoreError:NotFound in /tmp/.tmp9SeJRW/taskmill/src/store/mod.rs:62
variant StoreError:InvalidState in /tmp/.tmp9SeJRW/taskmill/src/store/mod.rs:64
variant StoreError:InvalidDependency in /tmp/.tmp9SeJRW/taskmill/src/store/mod.rs:54
variant StoreError:DependencyFailed in /tmp/.tmp9SeJRW/taskmill/src/store/mod.rs:56
variant StoreError:CyclicDependency in /tmp/.tmp9SeJRW/taskmill/src/store/mod.rs:58
variant StoreError:InvalidTag in /tmp/.tmp9SeJRW/taskmill/src/store/mod.rs:60
variant StoreError:NotFound in /tmp/.tmp9SeJRW/taskmill/src/store/mod.rs:62
variant StoreError:InvalidState in /tmp/.tmp9SeJRW/taskmill/src/store/mod.rs:64
variant SubmitOutcome:Superseded in /tmp/.tmp9SeJRW/taskmill/src/task/submission.rs:113
variant SubmitOutcome:Rejected in /tmp/.tmp9SeJRW/taskmill/src/task/submission.rs:120
variant SubmitOutcome:Superseded in /tmp/.tmp9SeJRW/taskmill/src/task/submission.rs:113
variant SubmitOutcome:Rejected in /tmp/.tmp9SeJRW/taskmill/src/task/submission.rs:120
variant SchedulerEvent:Superseded in /tmp/.tmp9SeJRW/taskmill/src/scheduler/event.rs:102
variant SchedulerEvent:BatchSubmitted in /tmp/.tmp9SeJRW/taskmill/src/scheduler/event.rs:120
variant SchedulerEvent:TaskExpired in /tmp/.tmp9SeJRW/taskmill/src/scheduler/event.rs:127
variant SchedulerEvent:RecurringSkipped in /tmp/.tmp9SeJRW/taskmill/src/scheduler/event.rs:134
variant SchedulerEvent:RecurringCompleted in /tmp/.tmp9SeJRW/taskmill/src/scheduler/event.rs:140
variant SchedulerEvent:TaskUnblocked in /tmp/.tmp9SeJRW/taskmill/src/scheduler/event.rs:147
variant SchedulerEvent:DeadLettered in /tmp/.tmp9SeJRW/taskmill/src/scheduler/event.rs:153
variant SchedulerEvent:DependencyFailed in /tmp/.tmp9SeJRW/taskmill/src/scheduler/event.rs:159
variant SchedulerEvent:Superseded in /tmp/.tmp9SeJRW/taskmill/src/scheduler/event.rs:102
variant SchedulerEvent:BatchSubmitted in /tmp/.tmp9SeJRW/taskmill/src/scheduler/event.rs:120
variant SchedulerEvent:TaskExpired in /tmp/.tmp9SeJRW/taskmill/src/scheduler/event.rs:127
variant SchedulerEvent:RecurringSkipped in /tmp/.tmp9SeJRW/taskmill/src/scheduler/event.rs:134
variant SchedulerEvent:RecurringCompleted in /tmp/.tmp9SeJRW/taskmill/src/scheduler/event.rs:140
variant SchedulerEvent:TaskUnblocked in /tmp/.tmp9SeJRW/taskmill/src/scheduler/event.rs:147
variant SchedulerEvent:DeadLettered in /tmp/.tmp9SeJRW/taskmill/src/scheduler/event.rs:153
variant SchedulerEvent:DependencyFailed in /tmp/.tmp9SeJRW/taskmill/src/scheduler/event.rs:159
variant TaskStatus:Blocked in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:106
variant TaskStatus:Blocked in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:106
variant HistoryStatus:Cancelled in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:142
variant HistoryStatus:Superseded in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:143
variant HistoryStatus:Expired in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:144
variant HistoryStatus:DependencyFailed in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:147
variant HistoryStatus:DeadLetter in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:154
variant HistoryStatus:Cancelled in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:142
variant HistoryStatus:Superseded in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:143
variant HistoryStatus:Expired in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:144
variant HistoryStatus:DependencyFailed in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:147
variant HistoryStatus:DeadLetter in /tmp/.tmp9SeJRW/taskmill/src/task/mod.rs:154
--- failure inherent_method_missing: pub method removed or renamed ---
Description:
A publicly-visible method or associated fn is no longer available under its prior name. It may have been renamed or removed entirely.
ref: https://doc.rust-lang.org/cargo/reference/semver.html#item-remove
impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.46.0/src/lints/inherent_method_missing.ron
Failed in:
TaskSubmission::expected_net_io, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/submission.rs:186
TaskSubmission::with_payload, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/submission.rs:231
TaskSubmission::expected_net_io, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/submission.rs:186
TaskSubmission::with_payload, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/submission.rs:231
TaskContext::submit, previously in file /tmp/.tmptg1HQQ/taskmill/src/registry/context.rs:140
TaskContext::submit_typed, previously in file /tmp/.tmptg1HQQ/taskmill/src/registry/context.rs:151
TaskContext::submit_typed_at, previously in file /tmp/.tmptg1HQQ/taskmill/src/registry/context.rs:160
TaskContext::submit, previously in file /tmp/.tmptg1HQQ/taskmill/src/registry/context.rs:140
TaskContext::submit_typed, previously in file /tmp/.tmptg1HQQ/taskmill/src/registry/context.rs:151
TaskContext::submit_typed_at, previously in file /tmp/.tmptg1HQQ/taskmill/src/registry/context.rs:160
SchedulerBuilder::executor, previously in file /tmp/.tmptg1HQQ/taskmill/src/scheduler/builder.rs:97
SchedulerBuilder::typed_executor, previously in file /tmp/.tmptg1HQQ/taskmill/src/scheduler/builder.rs:108
SchedulerBuilder::executor, previously in file /tmp/.tmptg1HQQ/taskmill/src/scheduler/builder.rs:97
SchedulerBuilder::typed_executor, previously in file /tmp/.tmptg1HQQ/taskmill/src/scheduler/builder.rs:108
--- failure method_parameter_count_changed: pub method parameter count changed ---
Description:
A publicly-visible method now takes a different number of parameters, not counting the receiver (self) parameter.
ref: https://doc.rust-lang.org/cargo/reference/semver.html#fn-change-arity
impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.46.0/src/lints/method_parameter_count_changed.ron
Failed in:
taskmill::task::TaskSubmission::expected_io now takes 1 parameters instead of 2, in /tmp/.tmp9SeJRW/taskmill/src/task/submission.rs:525
taskmill::TaskSubmission::expected_io now takes 1 parameters instead of 2, in /tmp/.tmp9SeJRW/taskmill/src/task/submission.rs:525
taskmill::store::TaskStore::fail now takes 6 parameters instead of 5, in /tmp/.tmp9SeJRW/taskmill/src/store/lifecycle/fail.rs:29
taskmill::store::TaskStore::fail_with_record now takes 6 parameters instead of 5, in /tmp/.tmp9SeJRW/taskmill/src/store/lifecycle/fail.rs:72
taskmill::TaskStore::fail now takes 6 parameters instead of 5, in /tmp/.tmp9SeJRW/taskmill/src/store/lifecycle/fail.rs:29
taskmill::TaskStore::fail_with_record now takes 6 parameters instead of 5, in /tmp/.tmp9SeJRW/taskmill/src/store/lifecycle/fail.rs:72
--- failure struct_missing: pub struct removed or renamed ---
Description:
A publicly-visible struct cannot be imported by its prior path. A `pub use` may have been removed, or the struct itself may have been renamed or removed entirely.
ref: https://doc.rust-lang.org/cargo/reference/semver.html#item-remove
impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.46.0/src/lints/struct_missing.ron
Failed in:
struct taskmill::task::TaskMetrics, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/mod.rs:192
struct taskmill::TaskMetrics, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/mod.rs:192
--- failure struct_pub_field_missing: pub struct's pub field removed or renamed ---
Description:
A publicly-visible struct has at least one public field that is no longer available under its prior name. It may have been renamed or removed entirely.
ref: https://doc.rust-lang.org/cargo/reference/semver.html#item-remove
impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.46.0/src/lints/struct_pub_field_missing.ron
Failed in:
field expected_read_bytes of struct TaskSubmission, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/submission.rs:67
field expected_write_bytes of struct TaskSubmission, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/submission.rs:68
field expected_net_rx_bytes of struct TaskSubmission, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/submission.rs:70
field expected_net_tx_bytes of struct TaskSubmission, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/submission.rs:72
field expected_read_bytes of struct TaskSubmission, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/submission.rs:67
field expected_write_bytes of struct TaskSubmission, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/submission.rs:68
field expected_net_rx_bytes of struct TaskSubmission, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/submission.rs:70
field expected_net_tx_bytes of struct TaskSubmission, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/submission.rs:72
field expected_read_bytes of struct TaskRecord, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/mod.rs:110
field expected_write_bytes of struct TaskRecord, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/mod.rs:111
field expected_net_rx_bytes of struct TaskRecord, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/mod.rs:113
field expected_net_tx_bytes of struct TaskRecord, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/mod.rs:115
field expected_read_bytes of struct TaskRecord, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/mod.rs:110
field expected_write_bytes of struct TaskRecord, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/mod.rs:111
field expected_net_rx_bytes of struct TaskRecord, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/mod.rs:113
field expected_net_tx_bytes of struct TaskRecord, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/mod.rs:115
field expected_read_bytes of struct TaskHistoryRecord, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/mod.rs:158
field expected_write_bytes of struct TaskHistoryRecord, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/mod.rs:159
field expected_net_rx_bytes of struct TaskHistoryRecord, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/mod.rs:161
field expected_net_tx_bytes of struct TaskHistoryRecord, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/mod.rs:163
field actual_read_bytes of struct TaskHistoryRecord, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/mod.rs:164
field actual_write_bytes of struct TaskHistoryRecord, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/mod.rs:165
field actual_net_rx_bytes of struct TaskHistoryRecord, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/mod.rs:167
field actual_net_tx_bytes of struct TaskHistoryRecord, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/mod.rs:169
field expected_read_bytes of struct TaskHistoryRecord, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/mod.rs:158
field expected_write_bytes of struct TaskHistoryRecord, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/mod.rs:159
field expected_net_rx_bytes of struct TaskHistoryRecord, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/mod.rs:161
field expected_net_tx_bytes of struct TaskHistoryRecord, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/mod.rs:163
field actual_read_bytes of struct TaskHistoryRecord, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/mod.rs:164
field actual_write_bytes of struct TaskHistoryRecord, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/mod.rs:165
field actual_net_rx_bytes of struct TaskHistoryRecord, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/mod.rs:167
field actual_net_tx_bytes of struct TaskHistoryRecord, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/mod.rs:169
field task_id of struct EstimatedProgress, previously in file /tmp/.tmptg1HQQ/taskmill/src/scheduler/progress.rs:104
field task_type of struct EstimatedProgress, previously in file /tmp/.tmptg1HQQ/taskmill/src/scheduler/progress.rs:105
field key of struct EstimatedProgress, previously in file /tmp/.tmptg1HQQ/taskmill/src/scheduler/progress.rs:106
field label of struct EstimatedProgress, previously in file /tmp/.tmptg1HQQ/taskmill/src/scheduler/progress.rs:107
field task_id of struct EstimatedProgress, previously in file /tmp/.tmptg1HQQ/taskmill/src/scheduler/progress.rs:104
field task_type of struct EstimatedProgress, previously in file /tmp/.tmptg1HQQ/taskmill/src/scheduler/progress.rs:105
field key of struct EstimatedProgress, previously in file /tmp/.tmptg1HQQ/taskmill/src/scheduler/progress.rs:106
field label of struct EstimatedProgress, previously in file /tmp/.tmptg1HQQ/taskmill/src/scheduler/progress.rs:107
field task_id of struct EstimatedProgress, previously in file /tmp/.tmptg1HQQ/taskmill/src/scheduler/progress.rs:104
field task_type of struct EstimatedProgress, previously in file /tmp/.tmptg1HQQ/taskmill/src/scheduler/progress.rs:105
field key of struct EstimatedProgress, previously in file /tmp/.tmptg1HQQ/taskmill/src/scheduler/progress.rs:106
field label of struct EstimatedProgress, previously in file /tmp/.tmptg1HQQ/taskmill/src/scheduler/progress.rs:107
--- failure trait_method_missing: pub trait method removed or renamed ---
Description:
A trait method is no longer callable, and may have been renamed or removed entirely.
ref: https://doc.rust-lang.org/cargo/reference/semver.html#major-any-change-to-trait-item-signatures
impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.46.0/src/lints/trait_method_missing.ron
Failed in:
method expected_read_bytes of trait TypedTask, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/typed.rs:38
method expected_write_bytes of trait TypedTask, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/typed.rs:43
method expected_net_rx_bytes of trait TypedTask, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/typed.rs:48
method expected_net_tx_bytes of trait TypedTask, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/typed.rs:53
method expected_read_bytes of trait TypedTask, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/typed.rs:38
method expected_write_bytes of trait TypedTask, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/typed.rs:43
method expected_net_rx_bytes of trait TypedTask, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/typed.rs:48
method expected_net_tx_bytes of trait TypedTask, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/typed.rs:53
method expected_read_bytes of trait TypedTask, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/typed.rs:38
method expected_write_bytes of trait TypedTask, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/typed.rs:43
method expected_net_rx_bytes of trait TypedTask, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/typed.rs:48
method expected_net_tx_bytes of trait TypedTask, previously in file /tmp/.tmptg1HQQ/taskmill/src/task/typed.rs:53
```
<details><summary><i><b>Changelog</b></i></summary><p>
<blockquote>
## [0.4.0](v0.3.1...v0.4.0)
- 2026-03-18
### Added
- implement multi-module API
([#44](#44))
- adaptive retry with configurable backoff strategies
([#42](#42))
- add task metadata tags
([#40](#40))
- task dependencies with blocked status, cycle detection, and failure
cascading ([#39](#39))
- delayed and recurring task scheduling
([#38](#38))
- task TTL with automatic expiry, sweep, and child inheritance
([#33](#33))
- task superseding with atomic cancel-and-replace
([#32](#32))
- task cancellation with abort hooks
([#31](#31))
- bulk task submission with BatchOutcome, BatchSubmission builder,
intra-batch dedup, and chunking
([#30](#30))
- add byte-level progress reporting with EWMA throughput tracking
([#29](#29))
### Other
- split large store modules into focused sub-modules
([#43](#43))
- rewrite documentation to be user-facing
([#28](#28))
- [**breaking**] consolidate IO fields into IoBudget and introduce
TaskEventHeader ([#26](#26))
</blockquote>
</p></details>
---
This PR was generated with
[release-plz](https://github.com/release-plz/release-plz/).
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
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Summary
DuplicateStrategyenum (Skip,Supersede,Reject) to control duplicate-key handling on submissionHistoryStatus::Supersededon_cancelhooks and cascade-cancel children of superseded running tasks (reuses PR feat: task cancellation with abort hooks #31's cancellation machinery)SchedulerEvent::Supersededfor UI integrationon_duplicate()toTaskSubmissionbuilder andTypedTasktraitSubmitOutcomewithSupersededandRejectedvariantsDuplicateStrategyfrom crate rootTest plan
reject_returns_rejected—Rejectstrategy returnsRejectedsupersede_pending_replaces_in_place— in-place replacement, old recorded asSupersededin historysupersede_running_cancels_and_inserts_new— cancel + new insert, on_cancel fires, history recordedsupersede_emits_event—Supersededevent emittedsupersede_in_batch— batch submission with supersedechain_of_supersedes— A→B→C chain, 2 superseded history entriesCloses #15