It's a follow-up of #2949. It enables the lookahead collator to
dynamically adjust the aura slot size, which may change during the
runtime upgrade. It also addressed a couple of issues with time
constants I missed in the original PR.
Good news: it works. The parachain successfully switches from sync
backing with 12s slots to async backing with 6s slots.
Bad news: during the transitional period of a single block in which the
actual runtime upgrade is performed, it still gets the old slot duration
of 12s (as it gets it from the best block), resulting in a runtime panic
(logs follow). That doesn't affect the following block production of the
parachain. Ideas on how to improve the situation are appreciated.
<details>
```
2024-02-05 12:59:36.373 INFO tokio-runtime-worker sc_basic_authorship::basic_authorship: [Parachain] 🙌 Starting consensus session on top of parent 0x6fd2d8f904f12c22531bfabf77b16dc84a6a29e45d9ae358aa6547fbf3f0438b
2024-02-05 12:59:36.373 ERROR tokio-runtime-worker runtime: [Parachain] panicked at /home/s0me0ne/wrk/parity/polkadot-sdk/cumulus/pallets/aura-ext/src/consensus_hook.rs:69:9:
assertion `left == right` failed: slot number mismatch
left: Slot(142261198)
right: Slot(284522396)
2024-02-05 12:59:36.373 WARN tokio-runtime-worker sp_state_machine::overlayed_changes::changeset: [Parachain] 1 storage transactions are left open by the runtime. Those will be rolled back.
2024-02-05 12:59:36.373 WARN tokio-runtime-worker sp_state_machine::overlayed_changes::changeset: [Parachain] 1 storage transactions are left open by the runtime. Those will be rolled back.
2024-02-05 12:59:36.373 WARN tokio-runtime-worker basic-authorship: [Parachain] ❗ Inherent extrinsic returned unexpected error: Error at calling runtime api: Execution failed: Execution aborted due to trap: wasm trap: wasm `unreachable` instruction executed
WASM backtrace:
error while executing at wasm backtrace:
0: 0x4e4a3b - <unknown>!rust_begin_unwind
1: 0x46cf57 - <unknown>!core::panicking::panic_fmt::h3c280dba88683724
2: 0x46d238 - <unknown>!core::panicking::assert_failed_inner::hebac5970933beb4d
3: 0x3d00fc - <unknown>!core::panicking::assert_failed::h640a47e2fb5dfb4b
4: 0xd0db3 - <unknown>!frame_support::storage::transactional::with_transaction::hcbc31515f81b2ee1
5: 0x34d654 - <unknown>!<cumulus_pallet_parachain_system::pallet::Call<T> as frame_support::traits::dispatch::UnfilteredDispatchable>::dispatch_bypass_filter::{{closure}}::hb7c2c9a11fa88301
6: 0x3547db - <unknown>!environmental::local_key::LocalKey<T>::with::h783f2605ae27d6d3
7: 0x7f454 - <unknown>!<asset_hub_rococo_runtime::RuntimeCall as frame_support::traits::dispatch::UnfilteredDispatchable>::dispatch_bypass_filter::h5e11a01ab97c06c7
8: 0x7f237 - <unknown>!<asset_hub_rococo_runtime::RuntimeCall as sp_runtime::traits::Dispatchable>::dispatch::h7f8ae4a8fede71ca
9: 0x26a0f3 - <unknown>!frame_executive::Executive<System,Block,Context,UnsignedValidator,AllPalletsWithSystem,COnRuntimeUpgrade>::apply_extrinsic::h75e524ff34738391
10: 0x282211 - <unknown>!BlockBuilder_apply_extrinsic. Dropping.
2024-02-05 12:59:36.374 ERROR tokio-runtime-worker runtime: [Parachain] panicked at /home/s0me0ne/wrk/parity/polkadot-sdk/substrate/frame/aura/src/lib.rs:416:9:
assertion `left == right` failed: Timestamp slot must match `CurrentSlot`
left: Slot(142261198)
right: Slot(284522396)
2024-02-05 12:59:36.374 WARN tokio-runtime-worker sp_state_machine::overlayed_changes::changeset: [Parachain] 1 storage transactions are left open by the runtime. Those will be rolled back.
2024-02-05 12:59:36.374 WARN tokio-runtime-worker sp_state_machine::overlayed_changes::changeset: [Parachain] 1 storage transactions are left open by the runtime. Those will be rolled back.
2024-02-05 12:59:36.374 WARN tokio-runtime-worker basic-authorship: [Parachain] ❗ Inherent extrinsic returned unexpected error: Error at calling runtime api: Execution failed: Execution aborted due to trap: wasm trap: wasm `unreachable` instruction executed
WASM backtrace:
error while executing at wasm backtrace:
0: 0x4e4a3b - <unknown>!rust_begin_unwind
1: 0x46cf57 - <unknown>!core::panicking::panic_fmt::h3c280dba88683724
2: 0x46d238 - <unknown>!core::panicking::assert_failed_inner::hebac5970933beb4d
3: 0x3d00fc - <unknown>!core::panicking::assert_failed::h640a47e2fb5dfb4b
4: 0x9ece6 - <unknown>!frame_support::storage::transactional::with_transaction::h26f75cb9f9462088
5: 0x356d7e - <unknown>!environmental::local_key::LocalKey<T>::with::hbcf2d4e17b48fdb5
6: 0x7f507 - <unknown>!<asset_hub_rococo_runtime::RuntimeCall as frame_support::traits::dispatch::UnfilteredDispatchable>::dispatch_bypass_filter::h5e11a01ab97c06c7
7: 0x7f237 - <unknown>!<asset_hub_rococo_runtime::RuntimeCall as sp_runtime::traits::Dispatchable>::dispatch::h7f8ae4a8fede71ca
8: 0x26a0f3 - <unknown>!frame_executive::Executive<System,Block,Context,UnsignedValidator,AllPalletsWithSystem,COnRuntimeUpgrade>::apply_extrinsic::h75e524ff34738391
9: 0x282211 - <unknown>!BlockBuilder_apply_extrinsic. Dropping.
2024-02-05 12:59:36.374 DEBUG tokio-runtime-worker runtime::xcmp-queue-migration: [Parachain] Lazy migration finished: item gone
2024-02-05 12:59:36.374 ERROR tokio-runtime-worker runtime: [Parachain] panicked at /home/s0me0ne/wrk/parity/polkadot-sdk/cumulus/pallets/parachain-system/src/lib.rs:265:18:
set_validation_data inherent needs to be present in every block!
2024-02-05 12:59:36.374 ERROR tokio-runtime-worker aura::cumulus: [Parachain] err=Error { inner: Proposing
Caused by:
0: Error at calling runtime api: Execution failed: Execution aborted due to trap: wasm trap: wasm `unreachable` instruction executed
WASM backtrace:
error while executing at wasm backtrace:
0: 0x4e4a3b - <unknown>!rust_begin_unwind
1: 0x46cf57 - <unknown>!core::panicking::panic_fmt::h3c280dba88683724
2: 0x46da8b - <unknown>!core::option::expect_failed::hdf18d99c3adabca7
3: 0x2134cb - <unknown>!<cumulus_pallet_parachain_system::pallet::Pallet<T> as frame_support::traits::hooks::OnFinalize<<<<T as frame_system::pallet::Config>::Block as sp_runtime::traits::HeaderProvider>::HeaderT as sp_runtime::traits::Header>::Number>>::on_finalize::hf98aac39802896ba
4: 0x26a9d6 - <unknown>!frame_executive::Executive<System,Block,Context,UnsignedValidator,AllPalletsWithSystem,COnRuntimeUpgrade>::idle_and_finalize_hook::h32775c0df0749d92
5: 0x26ad9f - <unknown>!frame_executive::Executive<System,Block,Context,UnsignedValidator,AllPalletsWithSystem,COnRuntimeUpgrade>::finalize_block::h15e5a1a6b9ca8032
6: 0x2822bd - <unknown>!BlockBuilder_finalize_block
1: Execution failed: Execution aborted due to trap: wasm trap: wasm `unreachable` instruction executed
WASM backtrace:
error while executing at wasm backtrace:
0: 0x4e4a3b - <unknown>!rust_begin_unwind
1: 0x46cf57 - <unknown>!core::panicking::panic_fmt::h3c280dba88683724
2: 0x46da8b - <unknown>!core::option::expect_failed::hdf18d99c3adabca7
3: 0x2134cb - <unknown>!<cumulus_pallet_parachain_system::pallet::Pallet<T> as frame_support::traits::hooks::OnFinalize<<<<T as frame_system::pallet::Config>::Block as sp_runtime::traits::HeaderProvider>::HeaderT as sp_runtime::traits::Header>::Number>>::on_finalize::hf98aac39802896ba
4: 0x26a9d6 - <unknown>!frame_executive::Executive<System,Block,Context,UnsignedValidator,AllPalletsWithSystem,COnRuntimeUpgrade>::idle_and_finalize_hook::h32775c0df0749d92
5: 0x26ad9f - <unknown>!frame_executive::Executive<System,Block,Context,UnsignedValidator,AllPalletsWithSystem,COnRuntimeUpgrade>::finalize_block::h15e5a1a6b9ca8032
6: 0x2822bd - <unknown>!BlockBuilder_finalize_block }
```
</details>
---------
Co-authored-by: Bastian Köcher <git@kchr.de>
This opens up the proposer to only optionally create blocks. Nodes may
only make blocks when there are transactions or the chain is scheduled.
---------
Co-authored-by: command-bot <>
* Update substrate & polkadot
* min changes to make async backing compile
* (async backing) parachain-system: track limitations for unincluded blocks (#2438)
* unincluded segment draft
* read para head from storage proof
* read_para_head -> read_included_para_head
* Provide pub interface
* add errors
* fix unincluded segment update
* BlockTracker -> Ancestor
* add a dmp limit
* Read para head depending on the storage switch
* doc comments
* storage items docs
* add a sanity check on block initialize
* Check watermark
* append to the segment on block finalize
* Move segment update into set_validation_data
* Resolve para head todo
* option watermark
* fix comment
* Drop dmq check
* fix weight
* doc-comments on inherent invariant
* Remove TODO
* add todo
* primitives tests
* pallet tests
* doc comments
* refactor unincluded segment length into a ConsensusHook (#2501)
* refactor unincluded segment length into a ConsensusHook
* add docs
* refactor bandwidth_out calculation
Co-authored-by: Chris Sosnin <48099298+slumber@users.noreply.github.com>
* test for limits from impl
* fmt
* make tests compile
* update comment
* uncomment test
* fix collator test by adding parent to state proof
* patch HRMP watermark rules for unincluded segment
* get consensus-common tests to pass, using unincluded segment
* fix unincluded segment tests
* get all tests passing
* fmt
* rustdoc CI
* aura-ext: limit the number of authored blocks per slot (#2551)
* aura_ext consensus hook
* reverse dependency
* include weight into hook
* fix tests
* remove stray println
Co-authored-by: Chris Sosnin <48099298+slumber@users.noreply.github.com>
* fix test warning
* fix doc link
---------
Co-authored-by: Chris Sosnin <48099298+slumber@users.noreply.github.com>
Co-authored-by: Chris Sosnin <chris125_@live.com>
* parachain-system: ignore go ahead signal once upgrade is processed (#2594)
* handle goahead signal for unincluded segment
* doc comment
* add test
* parachain-system: drop processed messages from inherent data (#2590)
* implement `drop_processed_messages`
* drop messages based on relay parent number
* adjust tests
* drop changes to mqc
* fix comment
* drop test
* drop more dead code
* clippy
* aura-ext: check slot in consensus hook and remove all `CheckInherents` logic (#2658)
* aura-ext: check slot in consensus hook
* convert relay chain slot
* Make relay chain slot duration generic
* use fixed velocity hook for pallets with aura
* purge timestamp inherent
* fix warning
* adjust runtime tests
* fix slots in tests
* Make `xcm-emulator` test pass for new consensus hook (#2722)
* add pallets on_initialize
* tests pass
* add AuraExt on_init
* ".git/.scripts/commands/fmt/fmt.sh"
---------
Co-authored-by: command-bot <>
---------
Co-authored-by: Ignacio Palacios <ignacio.palacios.santos@gmail.com>
* update polkadot git refs
* CollationGenerationConfig closure is now optional (#2772)
* CollationGenerationConfig closure is now optional
* fix test
* propagate network-protocol-staging feature (#2899)
* Feature Flagging Consensus Hook Type Parameter (#2911)
* First pass
* fmt
* Added as default feature in tomls
* Changed to direct dependency feature
* Dealing with clippy error
* Update pallets/parachain-system/src/lib.rs
Co-authored-by: asynchronous rob <rphmeier@gmail.com>
---------
Co-authored-by: asynchronous rob <rphmeier@gmail.com>
* fmt
* bump deps and remove warning
* parachain-system: update RelevantMessagingState according to the unincluded segment (#2948)
* mostly address 2471 with a bug introduced
* adjust relevant messaging state after computing total
* fmt
* max -> min
* fix test implementation of xcmp source
* add test
* fix test message sending logic
* fix + test
* add more to unincluded segment test
* fmt
---------
Co-authored-by: Chris Sosnin <chris125_@live.com>
* Integrate new Aura / Parachain Consensus Logic in Parachain-Template / Polkadot-Parachain (#2864)
* add a comment
* refactor client/service utilities
* deprecate start_collator
* update parachain-template
* update test-service in the same way
* update polkadot-parachain crate
* fmt
* wire up new SubmitCollation message
* some runtime utilities for implementing unincluded segment runtime APIs
* allow parachains to configure their level of sybil-resistance when starting the network
* make aura-ext compile
* update to specify sybil resistance levels
* fmt
* specify relay chain slot duration in milliseconds
* update Aura to explicitly produce Send futures
also, make relay_chain_slot_duration a Duration
* add authoring duration to basic collator and document params
* integrate new basic collator into parachain-template
* remove assert_send used for testing
* basic-aura: only author when parent included
* update polkadot-parachain-bin
* fmt
* some fixes
* fixes
* add a RelayNumberMonotonicallyIncreases
* add a utility function for initializing subsystems
* some logging for timestamp adjustment
* fmt
* some fixes for lookahead collator
* add a log
* update `find_potential_parents` to account for sessions
* bound the loop
* restore & deprecate old start_collator and start_full_node functions.
* remove unnecessary await calls
* fix warning
* clippy
* more clippy
* remove unneeded logic
* ci
* update comment
Co-authored-by: Marcin S. <marcin@bytedude.com>
* (async backing) restore `CheckInherents` for backwards-compatibility (#2977)
* bring back timestamp
* Restore CheckInherents
* revert to empty CheckInherents
* make CheckInherents optional
* attempt
* properly end system blocks
* add some more comments
* ignore failing system parachain tests
* update refs after main feature branch merge
* comment out the offending tests because CI runs ignored tests
* fix warnings
* fmt
* revert to polkadot master
* cargo update -p polkadot-primitives -p sp-io
---------
Co-authored-by: asynchronous rob <rphmeier@gmail.com>
Co-authored-by: Ignacio Palacios <ignacio.palacios.santos@gmail.com>
Co-authored-by: Bradley Olson <34992650+BradleyOlson64@users.noreply.github.com>
Co-authored-by: Marcin S. <marcin@bytedude.com>
Co-authored-by: eskimor <eskimor@users.noreply.github.com>
Co-authored-by: Andronik <write@reusable.software>
* rough draft of potential parent search
* get things compiling
* fmt
* add new function to all RelayChainInterface implementations
* fix compilation
* set slot and timestamp based on relay parent, prepare for find-parent
* skeleton of new aura logic
* fmt
* introduce a collator module in the Aura crate
* extract different implementations into own modules
* make interface more convenient
* docs and todos for lookahead
* refactor basic collator to use new collator utility
* some more refactoring
* finish most of the control flow for new aura
* introduce backend as parameter
* fix compilation
* fix a couple more TODOs
* add an `announce_block` function to collator service
* announce with barrier
* rename block announcement validator to be more specific
* fmt
* clean up unused import errors
* update references to BlockAnnounceValidator
* rename unstable_reimpl
* add AuraUnincludedSegmentApi
* finish rename
* integrate AuraUnincludedSegmentApi
* add a new block announcement validator for backwards compatibility
* add some naive equivocation defenses
* rustfmt
* clean up remaining TODO [now]s
* fmt
* try to fix inprocess-interface
* actually fix compilation
* ignored -> rejected rephrase
* fix test compilation
* fmt
* clippy
s0me0ne-unkn0wn