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UncheckedMigrateToV4

polkadot_runtime_parachains::scheduler::migration

Struct UncheckedMigrateToV4 

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pub struct UncheckedMigrateToV4<T>(/* private fields */);
Expand description

Migration for consolidating coretime assignment scheduling into the Scheduler pallet.

V4 completes the transition to the new coretime scheduling model by moving all coretime-related storage from the deprecated top-level AssignerCoretime pallet into the Scheduler pallet.

Major changes in V4:

  • Removes ClaimQueue storage: The scheduler no longer maintains a claim queue. Assignment scheduling is now handled entirely through CoreSchedules managed by the assigner_coretime submodule.
  • Migrates CoreSchedules: Moves schedule assignments from the deprecated AssignerCoretime pallet to Scheduler pallet storage, following linked-list structure via next_schedule pointers.
  • Migrates CoreDescriptors: Moves core metadata (queue descriptors and current work state) from the deprecated pallet to Scheduler pallet storage.
  • Upgrades storage hasher: Changes from Twox256 (non-reversible) to Twox64Concat (reversible) for CoreSchedules, enabling efficient iteration and queries.
  • Preserves on-demand orders: Any Pool assignments remaining in ClaimQueue are migrated to the on-demand pallet queue to ensure no orders are lost.
  • Drops bulk assignments: Bulk assignments (from broker chain) in ClaimQueue are intentionally dropped as they will be rescheduled from CoreSchedules in the new model.

After this migration, the deprecated AssignerCoretime pallet becomes an empty stub that can be removed once all networks have upgraded.

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impl<T: Config> UncheckedMigrateToV4<T>

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pub fn pre_upgrade() -> Result<Vec<u8>, DispatchError>

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pub fn post_upgrade(state: Vec<u8>) -> Result<(), DispatchError>

Trait Implementations§

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impl<T: Config> UncheckedOnRuntimeUpgrade for UncheckedMigrateToV4<T>

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fn on_runtime_upgrade() -> Weight

Called within VersionedMigration to execute the actual migration. It is also expected that no version checks are performed within this function. Read more
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fn pre_upgrade() -> Result<Vec<u8>, DispatchError>

See [Hooks::pre_upgrade].
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fn post_upgrade(state: Vec<u8>) -> Result<(), DispatchError>

See [Hooks::post_upgrade].

Auto Trait Implementations§

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impl<T> Freeze for UncheckedMigrateToV4<T>

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impl<T> RefUnwindSafe for UncheckedMigrateToV4<T>
where T: RefUnwindSafe,

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impl<T> Send for UncheckedMigrateToV4<T>
where T: Send,

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impl<T> Sync for UncheckedMigrateToV4<T>
where T: Sync,

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impl<T> Unpin for UncheckedMigrateToV4<T>
where T: Unpin,

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impl<T> UnwindSafe for UncheckedMigrateToV4<T>
where T: UnwindSafe,

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