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Elastic scaling: runtime dependency tracking and enactment (#3479)

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Changes needed to implement the runtime part of elastic scaling:
https://github.com/paritytech/polkadot-sdk/issues/3131,
https://github.com/paritytech/polkadot-sdk/issues/3132,
https://github.com/paritytech/polkadot-sdk/issues/3202

Also fixes https://github.com/paritytech/polkadot-sdk/issues/3675

TODOs:

- [x] storage migration
- [x] optimise process_candidates from O(N^2)
- [x] drop backable candidates which form cycles
- [x] fix unit tests
- [x] add more unit tests
- [x] check the runtime APIs which use the pending availability storage.
We need to expose all of them, see
https://github.com/paritytech/polkadot-sdk/issues/3576
- [x] optimise the candidate selection. we're currently picking randomly
until we satisfy the weight limit. we need to be smart about not
breaking candidate chains while being fair to all paras -
https://github.com/paritytech/polkadot-sdk/pull/3573

Relies on the changes made in
https://github.com/paritytech/polkadot-sdk/pull/3233 in terms of the
inclusion policy and the candidate ordering

---------

Signed-off-by: alindima <alin@parity.io>
Co-authored-by: command-bot <>
Co-authored-by: eskimor <eskimor@users.noreply.github.com>
This commit is contained in:
Alin Dima
2024-03-21 12:10:45 +02:00
committed by GitHub
parent 75074952a8
commit 4842faf65d
18 changed files with 4061 additions and 1734 deletions
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polkadot/runtime/parachains/src/scheduler.rs
-10
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@@ -398,16 +398,6 @@ impl<T: Config> Pallet<T> {
});
}
/// Get the para (chain or thread) ID assigned to a particular core or index, if any. Core
/// indices out of bounds will return `None`, as will indices of unassigned cores.
pub(crate) fn core_para(core_index: CoreIndex) -> Option<ParaId> {
let cores = AvailabilityCores::<T>::get();
match cores.get(core_index.0 as usize) {
None | Some(CoreOccupied::Free) => None,
Some(CoreOccupied::Paras(entry)) => Some(entry.para_id()),
}
}
/// Get the validators in the given group, if the group index is valid for this session.
pub(crate) fn group_validators(group_index: GroupIndex) -> Option<Vec<ValidatorIndex>> {
ValidatorGroups::<T>::get().get(group_index.0 as usize).map(|g| g.clone())