Initial implementation for the plan discussed here: https://github.com/paritytech/polkadot-sdk/issues/701
Built on top of https://github.com/paritytech/polkadot-sdk/pull/1178
v0: https://github.com/paritytech/polkadot/pull/7554,
## Overall idea
When approval-voting checks a candidate and is ready to advertise the
approval, defer it in a per-relay chain block until we either have
MAX_APPROVAL_COALESCE_COUNT candidates to sign or a candidate has stayed
MAX_APPROVALS_COALESCE_TICKS in the queue, in both cases we sign what
candidates we have available.
This should allow us to reduce the number of approvals messages we have
to create/send/verify. The parameters are configurable, so we should
find some values that balance:
- Security of the network: Delaying broadcasting of an approval
shouldn't but the finality at risk and to make sure that never happens
we won't delay sending a vote if we are past 2/3 from the no-show time.
- Scalability of the network: MAX_APPROVAL_COALESCE_COUNT = 1 &
MAX_APPROVALS_COALESCE_TICKS =0, is what we have now and we know from
the measurements we did on versi, it bottlenecks
approval-distribution/approval-voting when increase significantly the
number of validators and parachains
- Block storage: In case of disputes we have to import this votes on
chain and that increase the necessary storage with
MAX_APPROVAL_COALESCE_COUNT * CandidateHash per vote. Given that
disputes are not the normal way of the network functioning and we will
limit MAX_APPROVAL_COALESCE_COUNT in the single digits numbers, this
should be good enough. Alternatively, we could try to create a better
way to store this on-chain through indirection, if that's needed.
## Other fixes:
- Fixed the fact that we were sending random assignments to
non-validators, that was wrong because those won't do anything with it
and they won't gossip it either because they do not have a grid topology
set, so we would waste the random assignments.
- Added metrics to be able to debug potential no-shows and
mis-processing of approvals/assignments.
## TODO:
- [x] Get feedback, that this is moving in the right direction. @ordian
@sandreim @eskimor @burdges, let me know what you think.
- [x] More and more testing.
- [x] Test in versi.
- [x] Make MAX_APPROVAL_COALESCE_COUNT &
MAX_APPROVAL_COALESCE_WAIT_MILLIS a parachain host configuration.
- [x] Make sure the backwards compatibility works correctly
- [x] Make sure this direction is compatible with other streams of work:
https://github.com/paritytech/polkadot-sdk/issues/635 &
https://github.com/paritytech/polkadot-sdk/issues/742
- [x] Final versi burn-in before merging
---------
Signed-off-by: Alexandru Gheorghe <alexandru.gheorghe@parity.io>
* Happy New Year!
* Remove year entierly
Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
* Remove years from copyright notice in the entire repo
---------
Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
* disputes/slashing: slash only backers for ForInvalid
* add an assertion in mock impl
* fix tests
* do not slash backers on onconcluded disputes
* slash an intersection of backers and losers
* zombienet/disputes: check for offence only for invalid disputes
* add backing votes to disputes bench builder
* Update runtime/parachains/src/builder.rs
* Brad implementers guide revisions 2 (#6239)
* Add disputes subsystems fix
* Updated dispute approval vote import reasoning
* Improved wording of my changes
* Resolving issues brought up in comments
* Update disputes prioritisation in `dispute-coordinator` (#6130)
* Scraper processes CandidateBacked events
* Change definition of best-effort
* Fix `dispute-coordinator` tests
* Unit test for dispute filtering
* Clarification comment
* Add tests
* Fix logic
If a dispute is not backed, not included and not confirmed we
don't participate but we do import votes.
* Add metrics for refrained participations
* Revert "Add tests"
This reverts commit 7b8391a087922ced942cde9cd2b50ff3f633efc0.
* Revert "Unit test for dispute filtering"
This reverts commit 92ba5fe678214ab360306313a33c781338e600a0.
* fix dispute-coordinator tests
* Fix scraping
* new tests
* Small fixes in guide
* Apply suggestions from code review
Co-authored-by: Andrei Sandu <54316454+sandreim@users.noreply.github.com>
* Fix some comments and remove a pointless test
* Code review feedback
* Clarification comment in tests
* Some tests
* Reference counted `CandidateHash` in scraper
* Proper handling for Backed and Included candidates in scraper
Backed candidates which are not included should be kept for a
predetermined window of finalized blocks. E.g. if a candidate is backed
but not included in block 2, and the window size is 2, the same
candidate should be cleaned after block 4 is finalized.
Add reference counting for candidates in scraper. A candidate can be
added on multiple block heights so we have to make sure we don't clean
it prematurely from the scraper.
Add tests.
* Update comments in tests
* Guide update
* Fix cleanup logic for `backed_candidates_by_block_number`
* Simplify cleanup
* Make spellcheck happy
* Update tests
* Extract candidate backing logic in separate struct
* Code review feedback
* Treat backed and included candidates in the same fashion
* Update some comments
* Small improvements in test
* spell check
* Fix some more comments
* clean -> prune
* Code review feedback
* Reword comment
* spelling
Co-authored-by: Andrei Sandu <54316454+sandreim@users.noreply.github.com>
* approval-voting: remove redundant validation check (#6266)
* approval-voting: remove a redundant check
* candidate-validation: remove unreachable check
* remove fill_block (#6200)
Co-authored-by: parity-processbot <>
* fix a compilation warning (#6279)
Fixes#6277.
* Only report concluded if there is an actual dispute. (#6270)
* Only report concluded if there is an actual dispute.
Hence no "non"-disputes will be added to disputes anymore.
* Fix redundant check.
* Test for no onesided disputes.
Co-authored-by: eskimor <eskimor@no-such-url.com>
* [ci] fix buildah image (#6281)
* Revert special casing of Kusama for grandpa rounds. (#6217)
Co-authored-by: eskimor <eskimor@no-such-url.com>
* Fixes "for loop over an `Option`" warnings (#6291)
Was seeing these warnings when running `cargo check --all`:
```
warning: for loop over an `Option`. This is more readably written as an `if let` statement
--> node/core/approval-voting/src/lib.rs:1147:21
|
1147 | for activated in update.activated {
| ^^^^^^^^^^^^^^^^
|
= note: `#[warn(for_loops_over_fallibles)]` on by default
help: to check pattern in a loop use `while let`
|
1147 | while let Some(activated) = update.activated {
| ~~~~~~~~~~~~~~~ ~~~
help: consider using `if let` to clear intent
|
1147 | if let Some(activated) = update.activated {
| ~~~~~~~~~~~~ ~~~
```
My guess is that `activated` used to be a SmallVec or similar, as is
`deactivated`. It was changed to an `Option`, the `for` still compiled (it's
technically correct, just weird), and the compiler didn't catch it until now.
* companion for #12599 (#6290)
* companion for #12599
* update Cargo.lock
* use cargo path instead of diener
* update lockfile for {"substrate"}
Co-authored-by: parity-processbot <>
* remove the runtime check and test
* append keys on past-session slashing
* runtime/disputes: allow importing backing votes after explicit for
* explicit MaliciousBacker error and a test
* update an outdated comment
* Revert "update an outdated comment"
This reverts commit 7c4c3f5a848f16e2b61435e981d814f00333ed41.
* Revert "remove the runtime check and test"
This reverts commit a5bff0c75e77effb5b7d3a1691de1b14bcdbd648.
* incremental punishment post conclusion + test
* punish backers post FOR vote
* remove unnecessary lifetime annotation
* add a comment to zombinet test
* typo
* fmt
* post merge test fixes
* fix test after changes in master
* address review nits
---------
Co-authored-by: Bradley Olson <34992650+BradleyOlson64@users.noreply.github.com>
Co-authored-by: Tsvetomir Dimitrov <tsvetomir@parity.io>
Co-authored-by: Andrei Sandu <54316454+sandreim@users.noreply.github.com>
Co-authored-by: Sergej Sakac <73715684+Szegoo@users.noreply.github.com>
Co-authored-by: eskimor <eskimor@users.noreply.github.com>
Co-authored-by: eskimor <eskimor@no-such-url.com>
Co-authored-by: Alexander Samusev <41779041+alvicsam@users.noreply.github.com>
Co-authored-by: Marcin S <marcin@bytedude.com>
Co-authored-by: Niklas Adolfsson <niklasadolfsson1@gmail.com>
* disputes pallet: Filter disputes with votes less than supermajority threshold
* Remove `max_spam_slots` usages
* Remove `SpamSlots`
* Remove `SpamSlotChange`
* Remove `Error<T>::PotentialSpam` and stale comments
* `create_disputes_with_no_spam` -> `create_disputes`
* Make tests compile - wip commit
* Rework `test_dispute_timeout`. Rename `update_spam_slots` to `filter_dispute_set`
* Remove `dispute_statement_becoming_onesided_due_to_spamslots_is_accepted` and `filter_correctly_accounts_spam_slots` -> they bring no value with removed spam slots
* Fix `test_provide_multi_dispute_success_and_other`
* Remove an old comment
* Remove spam slots from tests - clean todo comments
* Remove test - `test_decrement_spam`
* todo comments
* Update TODO comments
* Extract `test_unconfirmed_are_ignored` as separate test case
* Remove dead code
* Fix `test_unconfirmed_are_ignored`
* Remove dead code in `filter_dispute_data`
* Fix weights (related to commit "Remove `SpamSlots`")
* Disputes migration - first try
* Remove `dispute_max_spam_slots` + storage migration
* Fix `HostConfig` migration tests
* Deprecate `SpamSlots`
* Code review feedback
* add weight for storage version update
* fix bound for clear()
* Fix weights in disputes migration
* Revert "Deprecate `SpamSlots`"
This reverts commit 8c4d967c7b061abd76ba8b551223918c0b9e6370.
* Make mod migration public
* Remove `SpamSlots` from disputes pallet and use `storage_alias` in the migration
* Fix call to `clear()` for `SpamSlots` in migration
* Update migration and add a `try-runtime` test
* Add `pre_upgrade` `try-runtime` test
* Fix some test names in `HostConfiguration` migration
* Link spamslots migration in all runtimes
* Add `test_unconfirmed_disputes_cause_block_import_error`
* Update guide
- Remove `SpamSlots` related information from roadmap/implementers-guide/src/runtime/disputes.md
- Add 'Disputes filtering' to Runtime section of the Implementor's guide
* Update runtime/parachains/src/configuration/migration.rs
Co-authored-by: Marcin S. <marcin@bytedude.com>
* Code review feedback - update logs
* Code review feedback: fix weights
* Update runtime/parachains/src/disputes.rs
Co-authored-by: s0me0ne-unkn0wn <48632512+s0me0ne-unkn0wn@users.noreply.github.com>
* Additional logs in disputes migration
* Fix merge conflicts
* Add version checks in try-runtime tests
* Fix a compilation warning`
Co-authored-by: Marcin S. <marcin@bytedude.com>
Co-authored-by: s0me0ne-unkn0wn <48632512+s0me0ne-unkn0wn@users.noreply.github.com>
* disputes: runtime part of slashing
* disputes: reward winners
* disputes/slashing: validate_unsigned impl
* fmt
* disputes/slashing: report_dispute_lost_unsigned
* disputes/slashing: separate winners from losers and report winners
* disputes/slashing: refactoring
* impl HandleReports
* enable on Wenstend
* fmt
* add slashing pallet to the mock and test runtimes
* fix a bug in report_dispute_lost_unsigned
* fmt
* disputes: remove new_participants from summary
* disputes: remove punish_inconclusive
* impl SlashingHandler for Pallet for type-safety
* do not impl slashing::Config on mainnets yet
* teach spellcheck deduplication
* simplify interfaces and resolve some TODOs
* resolve some more TODOs
* minor typos
* move slashing into a folder
* remove unnecessary clone
* fix validator_set_count calculation
* introduce ValidatorSetCount
* store ValidatorSetCount
* fmt
* add the benchmark
* fmt
* unflatten slashing
* post-rebase fixes
* remove winners eagerly
* use real slashing weights for westend
* remove bench test suite
* zombinet: modify disputes test to check for an offence report
* zombinet: add a timeout
* add slashing pallet to Rococo
* zombienet: revert back to rococo-local
* fmt
* remove TODOs
* revert some accidental changes
* slashing is submodule of disputes
* Change the log target
Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>
* wrap comments with rustfmt, more docs, constants
* use Defensive trait
* cargo update -p sp-io
* merge offence types, remove rewards for now
* cargo update -p sp-io
* benchmark fixes
* fmt
* unused var
* fix block_author impl
* ressurect RewardValidators trait
* remove outdated comment
* more module docs
* introduce BenchmarkingConfig
* typo fix
* teach spellcheck unapplied
* use Weight::new()
* fix mocking rewards
* use RefTimeWeight
* ".git/.scripts/bench-bot.sh" runtime westend-dev runtime_parachains::disputes::slashing
* refactor maybe_identify_validators
* no more ticket in disguise
* remove outdated comments
* lower against valid to 0.1%
* bump zombienet version for debug
* use from_perthousand
* post-merge fixes
* another day, another Weight changes
* Revert "bump zombienet version for debug"
This reverts commit 0d9978711f8ec9a746a5e1c45e8ffbe7c75e7b5c.
* do not reward block authors
* fix outdated comment
* use Pays from frame_support::dispatch::Pays
* add timeout to is up
Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>
Co-authored-by: command-bot <>
Co-authored-by: Javier Viola <javier@parity.io>
Co-authored-by: Javier Viola <pepoviola@gmail.com>
* filter again if it's the first statement and spam slots were applied
* Update runtime/parachains/src/disputes.rs
Co-authored-by: Andronik <write@reusable.software>
* fixins
* add a proper test case, simplify some code
Co-authored-by: Andronik <write@reusable.software>
* remove v0 primitives from polkadot-primitives
* first pass: remove v0
* fix fallout in erasure-coding
* remove v1 primitives, consolidate to v2
* the great import update
* update runtime_api_impl_v1 to v2 as well
* guide: add `Version` request for runtime API
* add version query to runtime API
* reintroduce OldV1SessionInfo in a limited way
Alexandru Gheorghe