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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/roadmap/implementers-guide/src/runtime/inclusion.md
+6 -5
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@@ -147,15 +147,16 @@ All failed checks should lead to an unrecoverable error making the block invalid
// return a vector of cleaned-up core IDs.
}
```
* `force_enact(ParaId)`: Forcibly enact the candidate with the given ID as though it had been deemed available by
bitfields. Is a no-op if there is no candidate pending availability for this para-id. This should generally not be
used but it is useful during execution of Runtime APIs, where the changes to the state are expected to be discarded
directly after.
* `force_enact(ParaId)`: Forcibly enact the pending candidates of the given paraid as though they had been deemed
available by bitfields. Is a no-op if there is no candidate pending availability for this para-id.
If there are multiple candidates pending availability for this para-id, it will enact all of
them. This should generally not be used but it is useful during execution of Runtime APIs,
where the changes to the state are expected to be discarded directly after.
* `candidate_pending_availability(ParaId) -> Option<CommittedCandidateReceipt>`: returns the `CommittedCandidateReceipt`
pending availability for the para provided, if any.
* `pending_availability(ParaId) -> Option<CandidatePendingAvailability>`: returns the metadata around the candidate
pending availability for the para, if any.
* `collect_disputed(disputed: Vec<CandidateHash>) -> Vec<CoreIndex>`: Sweeps through all paras pending availability. If
* `free_disputed(disputed: Vec<CandidateHash>) -> Vec<CoreIndex>`: Sweeps through all paras pending availability. If
the candidate hash is one of the disputed candidates, then clean up the corresponding storage for that candidate and
the commitments. Return a vector of cleaned-up core IDs.