* Replace `RollingSessionWindow` with `RuntimeInfo` - initial commit

* Fix tests in import

* Fix the rest of the tests

* Remove dead code

* Fix todos

* Simplify session caching

* Comments for `SessionInfoProvider`

* Separate `SessionInfoProvider` from `State`

* `cache_session_info_for_head` becomes freestanding function

* Remove unneeded `mut` usage

* fn session_info -> fn get_session_info() to avoid name clashes. The function also tries to initialize `SessionInfoProvider`

* Fix SessionInfo retrieval

* Code cleanup

* Don't wrap `SessionInfoProvider` in an `Option`

* Remove `earliest_session()`

* Remove pre-caching -> wip

* Fix some tests and code cleanup

* Fix all tests

* Fixes in tests

* Fix comments, variable names and small style changes

* Fix a warning

* impl From<SessionWindowSize> for NonZeroUsize

* Fix logging for `get_session_info` - remove redundant logs and decrease log level to DEBUG

* Code review feedback

* Storage migration removing `COL_SESSION_WINDOW_DATA` from parachains db

* Remove `col_session_data` usages

* Storage migration clearing columns w/o removing them

* Remove session data column usages from `approval-voting` and `dispute-coordinator` tests

* Add some test cases from `RollingSessionWindow` to `dispute-coordinator` tests

* Fix formatting in initialized.rs

* Fix a corner case in `SessionInfo` caching for `dispute-coordinator`

* Remove `RollingSessionWindow` ;(

* Revert "Fix formatting in initialized.rs"

This reverts commit 0f94664ec9f3a7e3737a30291195990e1e7065fc.

* v2 to v3 migration drops `COL_DISPUTE_COORDINATOR_DATA` instead of clearing it

* Fix `NUM_COLUMNS` in `approval-voting`

* Use `columns::v3::NUM_COLUMNS` when opening db

* Update node/service/src/parachains_db/upgrade.rs

Co-authored-by: Andrei Sandu <[email protected]>

* Don't write in `COL_DISPUTE_COORDINATOR_DATA` for `test_rocksdb_migrate_2_to_3`

* Fix `NUM+COLUMNS` in approval_voting

* Fix formatting

* Fix columns usage

* Clarification comments about the different db versions

---------

Co-authored-by: Andrei Sandu <[email protected]>

* runtime/vstaging: unapplied_slashes runtime API

* runtime/vstaging: key_ownership_proof runtime API

* runtime/ParachainHost: submit_report_dispute_lost

* fix key_ownership_proof API

* runtime: submit_report_dispute_lost runtime API

* nits

* Update node/subsystem-types/src/messages.rs

Co-authored-by: Marcin S. <[email protected]>

* revert unrelated fmt changes

* post merge fixes

* fix compilation

---------

Co-authored-by: Marcin S. <[email protected]>

* PVF: Refactor workers into separate crates, remove host dependency

* Fix compile error

* Remove some leftover code

* Fix compile errors

* Update Cargo.lock

* Remove worker main.rs files

I accidentally copied these from the other PR. This PR isn't intended to
introduce standalone workers yet.

* Address review comments

* cargo fmt

* Update a couple of comments

* Update log targets

* Companion: Substrate#13869

https://github.com/paritytech/substrate/pull/13869

* update lockfile for {"substrate"}

* ".git/.scripts/commands/fmt/fmt.sh"

---------

Co-authored-by: parity-processbot <>

* PVF: instantiate runtime from bytes

* Update naming

* Make `issue_explicit_statement_with_index` regular function

* Make `issue_backing_statement_with_index` regular function

* Issue `RevertBlocks` as soon as a dispute has `byzantine threshold + 1` invalid votes.

* Remove a comment

* Fix `has_fresh_byzantine_threshold_against()`

* Extend `informs_chain_selection_when_dispute_concluded_against` test

* PVF: Remove `rayon` and some uses of `tokio`

1. We were using `rayon` to spawn a superfluous thread to do execution, so it was removed.

2. We were using `rayon` to set a threadpool-specific thread stack size, and AFAIK we couldn't do that with `tokio` (it's possible [per-runtime](https://docs.rs/tokio/latest/tokio/runtime/struct.Builder.html#method.thread_stack_size) but not per-thread). Since we want to remove `tokio` from the workers [anyway](https://github.com/paritytech/polkadot/issues/7117), I changed it to spawn threads with the `std::thread` API instead of `tokio`.[^1]

[^1]: NOTE: This PR does not totally remove the `tokio` dependency just yet.

3. Since `std::thread` API is not async, we could no longer `select!` on the threads as futures, so the `select!` was changed to a naive loop.

4. The order of thread selection was flipped to make (3) sound (see note in code).

I left some TODO's related to panics which I'm going to address soon as part of https://github.com/paritytech/polkadot/issues/7045.

* PVF: Vote invalid on panics in execution thread (after a retry)

Also make sure we kill the worker process on panic errors and internal errors to
potentially clear any error states independent of the candidate.

* Address a couple of TODOs

Addresses a couple of follow-up TODOs from
https://github.com/paritytech/polkadot/pull/7153

.

* Add some documentation to implementer's guide

* Fix compile error

* Fix compile errors

* Fix compile error

* Update roadmap/implementers-guide/src/node/utility/candidate-validation.md

Co-authored-by: Andrei Sandu <[email protected]>

* Address comments + couple other changes (see message)

- Measure the CPU time in the prepare thread, so the observed time is not
  affected by any delays in joining on the thread.

- Measure the full CPU time in the execute thread.

* Implement proper thread synchronization

Use condvars i.e. `Arc::new((Mutex::new(true), Condvar::new()))` as per the std
docs.

Considered also using a condvar to signal the CPU thread to end, in place of an
mpsc channel. This was not done because `Condvar::wait_timeout_while` is
documented as being imprecise, and `mpsc::Receiver::recv_timeout` is not
documented as such. Also, we would need a separate condvar, to avoid this case:
the worker thread finishes its job, notifies the condvar, the CPU thread returns
first, and we join on it and not the worker thread. So it was simpler to leave
this part as is.

* Catch panics in threads so we always notify condvar

* Use `WaitOutcome` enum instead of bool condition variable

* Fix retry timeouts to depend on exec timeout kind

* Address review comments

* Make the API for condvars in workers nicer

* Add a doc

* Use condvar for memory stats thread

* Small refactor

* Enumerate internal validation errors in an enum

* Fix comment

* Add a log

* Fix test

* Update variant naming

* Address a missed TODO

---------

Co-authored-by: Andrei Sandu <[email protected]>

* Replace `RollingSessionWindow` with `RuntimeInfo` - initial commit

* Fix tests in import

* Fix the rest of the tests

* Remove dead code

* Fix todos

* Simplify session caching

* Comments for `SessionInfoProvider`

* Separate `SessionInfoProvider` from `State`

* `cache_session_info_for_head` becomes freestanding function

* Remove unneeded `mut` usage

* fn session_info -> fn get_session_info() to avoid name clashes. The function also tries to initialize `SessionInfoProvider`

* Fix SessionInfo retrieval

* Code cleanup

* Don't wrap `SessionInfoProvider` in an `Option`

* Remove `earliest_session()`

* Remove pre-caching -> wip

* Fix some tests and code cleanup

* Fix all tests

* Fixes in tests

* Fix comments, variable names and small style changes

* Fix a warning

* impl From<SessionWindowSize> for NonZeroUsize

* Fix logging for `get_session_info` - remove redundant logs and decrease log level to DEBUG

* Code review feedback

* impl QueryChunkSize

Signed-off-by: Andrei Sandu <[email protected]>

* QueryChunkSize message

Signed-off-by: Andrei Sandu <[email protected]>

* enable fetching from backing group for small pov

Signed-off-by: Andrei Sandu <[email protected]>

* review feedback

Signed-off-by: Andrei Sandu <[email protected]>

* Refactor `bypass_availability_store`

Signed-off-by: Andrei Sandu <[email protected]>

* review feedback

Signed-off-by: Andrei Sandu <[email protected]>

---------

Signed-off-by: Andrei Sandu <[email protected]>

* Companion for substrate #14036

* Rollback of some trivial renamings

* update lockfile

* Fix stalling dispute coordinator.

* Initialization.

---------

Co-authored-by: eskimor <[email protected]>

Rework `dispute-coordinator` to use `RuntimeInfo` for obtaining session information instead of `RollingSessionWindow` (#6968)

* Pass `SessionInfo` directly to `CandidateEnvironment::new` otherwise it should be an async function

* Replace calls to `RollingSessionWindow` with `RuntimeInfo`

Adjust `dispute-coordinator` initialization to use `RuntimeInfo`

* Modify `dispute-coordinator` initialization

* Pass `Hash` to `process_on_chain_votes` so that `RuntimeInfo` calls can be made

Remove some fixmes

* Pass `Hash` to `handle_import_statements` to perform `RuntimeInfo` calls

* remove todo comments

* Remove `error` from `Initialized`

Rework new session handling code

* Remove db code which is no longer used

* Update stale comment and remove unneeded type specification

* Cache SessionInfo on startup

* Use `DISPUTE_WINDOW` from primitives

* Fix caching in `process_active_leaves_update`

* handle_import_statements: leaf_hash -> block_hash

* Restore `ensure_available_session_info`

* Don't interrupt `process_on_chain_votes` if SessionInfo can't be fetched

* Small style improvements in logging

* process_on_chain_votes: leaf_hash -> block_hash

* Restore `note_earliest_session` - it is required to prune disputes and votes

* Cache new sessions only when there is an actual session change

* Fix tests

* `CandidateEnvironment::new` gets `session_idx` and fetches SessionInfo by itself to avoid the invariant where the input SessionIndex and SessionInfo parameters don't match

* Fix handling of missing session info

* Move sessions caching in `handle_startup` and fix tests

* Load `relay_parent` from db in `handle_import_statements` instead of passing it as a parameter via two functions

* Don't do two db reads

* Fix the twisted logic in `handle_import_statements`

* fixup

* Small style fix

* Decrease log levels for caching errors to debug and fix a typo

* Update outdated comment

* Remove `ensure_available_session_info`

* Load relay parent from db in `process_on_chain_votes`

* Revert "Load relay parent from db in `process_on_chain_votes`"

This reverts commit 978ad4f223d517faa7a7fbad96e3f8de4fa17501.

* Keep track of highest seen session and last session cached without gaps.

* Apply suggestions from code review

Co-authored-by: ordian <[email protected]>

* Handle session caching failure on startup correctly

* Update node/core/dispute-coordinator/src/initialized.rs

Co-authored-by: ordian <[email protected]>

* Simplify session caching retries

* Update stale comment

* Fix lower bound calculation for session caching

---------

Co-authored-by: ordian <[email protected]>

* Move PVF workers into separate crate

* Fix indentation

* Fix compilation errors

* Fix more compilation errors

* Rename `worker.rs` files, make host interface to worker more clear

* Fix more compilation errors

* Fix more compilation errors

* Add link to issue

* Address review comments

* Update comment

* PVF: Don't dispute on missing artifact

A dispute should never be raised if the local cache doesn't provide a certain
artifact. You can not dispute based on this reason, as it is a local hardware
issue and not related to the candidate to check.

Design:

Currently we assume that if we prepared an artifact, it remains there on-disk
until we prune it, i.e. we never check again if it's still there.

We can change it so that instead of artifact-not-found triggering a dispute, we
retry once (like we do for AmbiguousWorkerDeath, except we don't dispute if it
still doesn't work). And when enqueuing an execute job, we check for the
artifact on-disk, and start preparation if not found.

Changes:

- [x] Integration test (should fail without the following changes)
- [x] Check if artifact exists when executing, prepare if not
- [x] Return an internal error when file is missing
- [x] Retry once on internal errors
- [x] Document design (update impl guide)

* Add some context to wasm error message (it is quite long)

* Fix impl guide

* Add check for missing/inaccessible file

* Add comment referencing Substrate issue

* Add test for retrying internal errors

---------

Co-authored-by: parity-processbot <>

* pvf: Update docs for PVF artifacts

* pvf: Clarify doc re. node start-up

* Companion for substrate #13889

* Remove leftover

* Remove removed dependency

* Remove sp-consensus-vrf from lock

* Revert "Remove sp-consensus-vrf from lock"

This reverts commit 2269ca1e32df89272e8fd4544292204db387f436.

* Fix after substrate modifications

* Fix tests to use new VRF Signature type

* Don't rely of Deref trait

* Fix test

* Further code simplification

* Reuse garbage_vrf_signature

* update lockfile for {"substrate"}

---------

Co-authored-by: parity-processbot <>

Bumps [hex-literal](https://github.com/RustCrypto/utils) from 0.3.4 to 0.4.1.
- [Release notes](https://github.com/RustCrypto/utils/releases)
- [Commits](https://github.com/RustCrypto/utils/compare/hex-literal-v0.3.4...hex-literal-v0.4.1

)

---
updated-dependencies:
- dependency-name: hex-literal
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* Simplify &(ref foo, _) tuple pattern matches
* Drop unneccessary .clone() calls
* Replace .position(cond).is_some() by .any(cond)
* Drop unneccessary lifetime specs

* Happy New Year!

* Remove year entierly

Co-authored-by: Oliver Tale-Yazdi <[email protected]>

* Remove years from copyright notice in the entire repo

---------

Co-authored-by: Oliver Tale-Yazdi <[email protected]>

Onchain scraper in `dispute-coordinator` will scrape `SCRAPED_FINALIZED_BLOCKS_COUNT` blocks before finality (#7013)

* Onchain scraper in `dispute-coordinator` will scrape `SCRAPED_FINALIZED_BLOCKS_COUNT` blocks before finality

The purpose is to make the availability of a `CandidateReceipt` for finalized candidates more likely.

For details see:  https://github.com/paritytech/polkadot/issues/7009

* Fix off by one error

* Replace `SCRAPED_FINALIZED_BLOCKS_COUNT` with `DISPUTE_CANDIDATE_LIFETIME_AFTER_FINALIZATION`

* Move version check to `worker_event_loop`

* More minor refactors

- More consistent use of `format_invalid` and `format_internal`.
- Fix a doc error.
- Fix some poorly-named local variables.

* Companion for paritytech/substrate#13811

* Add comment

* update lockfile for {"substrate"}

* Update Substrate

Signed-off-by: Oliver Tale-Yazdi <[email protected]>

* Fix pallet weight warnings

Signed-off-by: Oliver Tale-Yazdi <[email protected]>

---------

Signed-off-by: Oliver Tale-Yazdi <[email protected]>
Co-authored-by: parity-processbot <>
Co-authored-by: Oliver Tale-Yazdi <[email protected]>

* Substrate companion: Remove deprecated batch verification

* update lockfile for {"substrate"}

---------

Co-authored-by: parity-processbot <>

* Pass the PerLeafSpan as mutable reference to handle_new_head function

* cargo +nightly fmt --all

* Add mock span for test

* cargo +nightly fmt --all

* add new-blocks-hashes to span

* ref span in match statement, set span to disabled if not passed

* remove second match clause, make handle_new_head_span mutable

* cargo +nightly fmt --all

* improve tag on error and warning

* add imported blocks and info span

* cargo +nightly fmt --all

* Improve error for imported_blocks_and_info trace

* format tags on get_header_span

* add lost-to-finality tag

* add missing bracket

* - Add bitfield child span
- Add block db insertion span

* - fix update-bitfield span tag

* - Fix type conversion to u64
- Add missing argument

* - Cargo fmt

* - Test add_follows_from

* - Revert as  relationship between spans not working correctly

* - use drop to test if parent-child relationship can be re-established

* - remove bitfield span, check if parent-child relationship can be reestablished

* - Remove dangling bitfield span which is not used, to see if parent-child relationship can be re-established

* Another dangling bitfield span

* cargo fmt

* - add imported blocks and info span
- add candidate span per candidate

* add tags before moving block_header to push scope

* - Add db-insertion span

* cargo fmt

* fix types

* * Pass mutable reference to span in handle_new_head
* Change get-header-span tags in handle_new_head
* Create cache-session-info span in handle_new_head
* Create optional argument in determine_new_blocks
* Pass mutable reference to handle_new_head_span in determine_new_blocks in handle_new_head function
* Add candidate-hash, candidate-number, lost-to-finality tags to candidate_span in handle_new_head function
* Manually drop db_insertion_span and remove superfluous tags  to it, only keeping approved-bitfields tag
* Add ApprovalVoting stage in jaeger

* * Pass mutable reference to jaeger::Span in stead of PerLeafSpan
* Add block-import span

* *Pass optional_span (optional argument) to determine_new_blocks util function

* * Add num-candidates int tag to block_import_span

* * Add head tag to cache_session_span

* * Create PerLeafSpan in handle_from_overseer (this is required to establish parent-child relationship between approval-voting span, and leaf-activated root span)

* * Add candidate-import-span as child of block-import-span
* Add candidate-hash and num-approval tags to candidate-import-span

* * Fix num-candidate tag to bitvec-len tag in candidate-import-span

* *Fix imported_blocKs_and_info span to create new-block-span as not dealing with candidates

* Consider the future::select! block

* Use HashMap<Hash, jaeger::PerLeafSpan>

* Remove Stage 9

* Add missing spans

* cargo +nightly fmt --all

* Remove optional span argument for determine_new_blocks

* * Remove no-longer needed default PerLeafSpan implementation
* Remove no-longer necessary mock span given re-factoring of handle_new_head() no longer neeing mutable span
* Split validation-result and request-data (availability and validation code) spans into two by dropping request_validation_data_spans
* Remove drop statements for cache_session_info_span
*

* Remove unnecessary span

* Remove another excessively spammy span

* Add missing spans from State in import tests

* Use functional approach to get spans

* - Add functional approach for the approval-voting span
- Add doc on block_numbers given labelling ambiguity
- Add span pruning logic
- Use .add_para_id on validation_result_span

* Replace for hash_set in hash_set_iter with map closure

* cargo +nightly fmt --all

* Change from unconsumed `map` to `.for_each`

* cargo +nightly fmt --all

* Refactor add_para_id to validation_result_span

* cargo +nightly fmt --all

* Remove duplicate tag

* Add missing tag to handle-approved-ancestor span

* Refactor span pruning to only invoke retain once

* Typo in span name

* - Replace unwrap_or with unwrap_or_else due to lazy evaluation of trace-identifier in polkadot_node_jaeger
- Remove some redundant spans

* Add approval-distribution spans

* - Add unwrap_or_else on note-approved-in-chain-selection
- Use child_with_trace_id to add traceID string tag on span (note this does not change the traceID, but just adds a tag)

* cargo +nightly fmt --all

* - Add traceID tags were necessary in approval-voting and availability-distribution
- Always use block-hash tag in stead of relay-parent tag in approval-distribution

* Remove schedule-wakeup span as it will duplicate spans on existing wakeups (which should be a no-op)

* Remove a couple of warnings related to mutability

* Fix failing tests in availability distribution

* Add traceID tag to launch-approval and validation-result

* Reshuffle the validation and validation result spans to where more appropriate and add block-hash tag

* - Add tranche and should-trigger tag to process-wakeup span
- Add candidate-hash and traceID to check-and-import-approval span

* cargo fmt

* - Adjustments after PR comments

* Move span pruning after other pruning logic

* Remove DerefMut - no longer needed

* Relabel request-chunk spans

* - Fix typo in span label
- Add docs for drops

* Add new approval-voting span pruning logic

* Undo removal of !

* cargo fmt

* First pass adding logs

* fmt

* Adjustments

* Get rid of extra timers for running participations

* fmt

* Handling timer discards more elegantly

* Check spawned worker version vs node version before PVF preparation

* Address discussions

* Propagate errors and shutdown preparation and execution pipelines properly

* Add logs; Fix execution worker checks

* Revert "Propagate errors and shutdown preparation and execution pipelines properly"

This reverts commit b96cc3160ff58db5ff001d8ca0bfea9bd4bdd0f2.

* Don't try to shut down; report the condition and exit worker

* Get rid of `VersionMismatch` preparation error

* Merge master

* Add docs; Fix tests

* Update Cargo.lock

* Kill again, but only the main node process

* Move unsafe code to a common safe function

* Fix libc dependency error on MacOS

* pvf spawning: Add some logging, add a small integration test

* Minor fixes

* Restart CI

---------

Co-authored-by: Marcin S <[email protected]>

* Companion for #13683

* Wraps trait is not required

* update lockfile for {"substrate"}

---------

Co-authored-by: parity-processbot <>

This ensures that both subsystems exit when the Overseer has exited
because of some error.

* Added participation and queue sizes metrics

* First draft of all metric code

* Tests pass

* Changed Metrics to field on participation + queues

* fmt

* Improving naming

* Refactor, placing timer in ParticipationRequest

* fmt

* Final cleanup

* Revert "Final cleanup"

This reverts commit 02e5608df64b2e0f7810905e4508673b2037d351.

* Changing metric names

* Implementing Eq only for unit tests

* fmt

* Removing Clone trait from ParticipationRequest

* fmt

* Moved clone functionality to tests helper

* fmt

* Fixing dropped timers on repeat requests

* Keep older best effort timers

* Removing comment redundency and explaining better

* Updating queue() to use single mem read

* fmt

This reverts commit 5565bb9d.

* Remove not required async calls

* Fixed missing renaming

* make_keystore can be sync

* More fixes

* Trivial nitpicks

* Cherry pick test fix from master

* Fixes after master merge

* update lockfile for {"substrate"}

---------

Co-authored-by: parity-processbot <>

* First pass adding logs

* fmt

* Adjustments

* Added participation and queue sizes metrics

* First draft of all metric code

* Tests pass

* Changed Metrics to field on participation + queues

* fmt

* Improving naming

* Refactor, placing timer in ParticipationRequest

* fmt

* Final cleanup

* Revert "Final cleanup"

This reverts commit 02e5608df64b2e0f7810905e4508673b2037d351.

* Changing metric names

* Implementing Eq only for unit tests

* fmt

* Removing Clone trait from ParticipationRequest

* fmt

* Moved clone functionality to tests helper