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Egor_P
7b6b061e32
This PR backports: - node version bump - `spec_vesion` bump - reordering of the `prdocs` to the appropriate folder from the `1.9.0` release branch
46 lines
2.2 KiB
Plaintext
46 lines
2.2 KiB
Plaintext
# Schema: Polkadot SDK PRDoc Schema (prdoc) v1.0.0
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# See doc at https://raw.githubusercontent.com/paritytech/polkadot-sdk/master/prdoc/schema_user.json
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title: "Multi-Block-Migrations, `poll` hook and new System Callbacks"
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doc:
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- audience: Runtime Dev
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description: |
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The major things that this MR touches are:
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**Multi-Block-Migrations**: `pallet-migrations` is introduced that can be configured in the
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`System` of a runtime to act as multi-block migrator. The `migrations` pallet then in turn
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receives the list of MBMs as config parameter. The list of migrations can be an aggregated
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tuple of `SteppedMigration` trait implementation.
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It is paramount that the `migrations` pallet is configured in `System` once it is deployed. A
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test is in place to double check this.
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To integrate this into your runtime, it is only necessary to change the return type of
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`initialize_block` to `RuntimeExecutiveMode`. For extended info please see
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https://github.com/paritytech/polkadot-sdk/pull/1781.
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**poll**: a new pallet hook named `poll` is added. This can be used for places where the code
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that should be executed is not deadline critical. Runtime devs are advised to skim their usage
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of `on_initialize` and `on_finalize` to see whether they can be replace with `poll`. `poll` is
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not guaranteed to be called each block. In fact it will not be called when MBMs are ongoing.
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**System Callbacks**: The `system` pallet gets five new config items - all of which can be
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safely set to `()` as default. They are:
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- `SingleBlockMigrations`: replaces the `Executive` now for configuring migrations.
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- `MultiBlockMigrator`: the `pallet-migrations` would be set here, if deployed.
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- `PreInherents`: a hook that runs before any inherent.
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- `PostInherents`: a hook to run between inherents and `poll`/MBM logic.
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- `PostTransactions`: a hook to run after all transactions but before `on_idle`.
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crates:
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- name: frame-executive
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- name: frame-system
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- name: frame-support
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- name: frame-support-procedural
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- name: pallet-migrations
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- name: sc-basic-authorship
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- name: sc-block-builder
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- name: sp-api
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- name: sp-api-proc-macro
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- name: sp-runtime
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