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asset-hub-kusama: Prepare ElasticScaling with 3 cores on asset hub kusama and enable buffered election (#1037)
This PR configures the AssetHubKusama runtime to utilize elastic scaling with 3 cores. - the runtime is prepared for elastic scaling with expected 2s block times - 3 cores will be assigned to AHK when we have sufficient confidence in testing stacks - AHK should function similarly with expected 6s block times until cores are assigned The PR also enables buffered export of the validator set to the Relay Chain to handle block time changes from elastic scaling in KAH more gracefully. Without this, era lengths can shrink when multiple cores are used. See paritytech/polkadot-sdk#10142. --------- Signed-off-by: Alexandru Vasile <[email protected]> Co-authored-by: Ankan <[email protected]> Co-authored-by: Bastian Köcher <[email protected]>
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‎CHANGELOG.md‎

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@@ -4,8 +4,7 @@ Changelog for the runtimes governed by the Polkadot Fellowship.
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The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
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## [Unreleased]
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## [2.0.4] 18.12.2025
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### Changed
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@@ -14,6 +13,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
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- asset-hub-polkadot: increase the base deposit for a signed NPoS solution from 4 to 100 DOT, significantly mitigating the risk of transaction spamming ([#1022](https://github.com/polkadot-fellows/runtimes/pull/1022))
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- Adjust OpenGov parameters based on WFC 1701 ([polkadot-fellows/runtimes/pull/873](https://github.com/polkadot-fellows/runtimes/pull/873))
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- asset-hub-kusama: update to latest version of pallet-revive with EVM backend ([polkadot-fellows/runtimes/pull/1029](https://github.com/polkadot-fellows/runtimes/pull/1029))
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- Enable Elastic Scaling on Assethub Kusama ([polkadot-fellows/runtimes/pull/1037](https://github.com/polkadot-fellows/runtimes/pull/1037))
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- Enable buffered validator selection on Assethub Kusama ([polkadot-fellows/runtimes/pull/1037](https://github.com/polkadot-fellows/runtimes/pull/1037))
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### Added
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‎Cargo.lock‎

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‎Cargo.toml‎

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@@ -10,7 +10,7 @@ pallet-ah-migrator = { path = "pallets/ah-migrator", default-features = false }
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pallet-rc-migrator = { path = "pallets/rc-migrator", default-features = false }
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pallet-ah-ops = { path = "pallets/ah-ops", default-features = false }
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pallet-election-provider-multi-block = { version = "0.5.0", default-features = false }
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pallet-staking-async = { version = "0.7.0", default-features = false }
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pallet-staking-async = { version = "0.7.1", default-features = false }
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hex = { version = "0.4.3", default-features = false }
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rand = { version = "0.9.2" }
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impl-trait-for-tuples = { version = "0.2.3", default-features = false }
@@ -188,7 +188,7 @@ pallet-xcm-bridge-hub = { version = "0.20.0", default-features = false }
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pallet-xcm-bridge-hub-router = { version = "0.22.0", default-features = false }
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parachain-info = { version = "0.24.0", default-features = false, package = "staging-parachain-info" }
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parachains-common = { version = "26.0.0", default-features = false }
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parachains-runtimes-test-utils = { version = "27.0.0" }
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parachains-runtimes-test-utils = { version = "27.0.1" }
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paste = { version = "1.0.14" }
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penpal-emulated-chain = { path = "integration-tests/emulated/chains/parachains/testing/penpal" }
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penpal-runtime = { version = "0.34.0" }
@@ -266,7 +266,7 @@ system-parachains-common = { path = "system-parachains/common", default-features
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tokio = { version = "1.45.0" }
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xcm = { version = "20.0.0", default-features = false, package = "staging-xcm" }
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xcm-builder = { version = "24.0.0", default-features = false, package = "staging-xcm-builder" }
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xcm-emulator = { version = "0.24.0" }
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xcm-emulator = { version = "0.24.1" }
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xcm-executor = { version = "23.0.0", default-features = false, package = "staging-xcm-executor" }
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xcm-runtime-apis = { version = "0.11.0", default-features = false }
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anyhow = { version = "1.0.82" }

‎relay/kusama/src/lib.rs‎

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@@ -188,7 +188,7 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
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spec_name: alloc::borrow::Cow::Borrowed("kusama"),
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impl_name: alloc::borrow::Cow::Borrowed("parity-kusama"),
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authoring_version: 2,
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spec_version: 2_000_003,
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spec_version: 2_000_004,
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impl_version: 0,
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apis: RUNTIME_API_VERSIONS,
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transaction_version: 26,

‎relay/polkadot/src/lib.rs‎

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@@ -177,7 +177,7 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
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spec_name: alloc::borrow::Cow::Borrowed("polkadot"),
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impl_name: alloc::borrow::Cow::Borrowed("parity-polkadot"),
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authoring_version: 0,
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spec_version: 2_000_003,
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spec_version: 2_000_004,
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impl_version: 0,
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apis: RUNTIME_API_VERSIONS,
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transaction_version: 26,

‎system-parachains/asset-hubs/asset-hub-kusama/src/lib.rs‎

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@@ -109,7 +109,9 @@ use system_parachains_constants::{
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},
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kusama::{
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consensus::{
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async_backing::UNINCLUDED_SEGMENT_CAPACITY, BLOCK_PROCESSING_VELOCITY,
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elastic_scaling::{
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BLOCK_PROCESSING_VELOCITY, RELAY_PARENT_OFFSET, UNINCLUDED_SEGMENT_CAPACITY,
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},
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RELAY_CHAIN_SLOT_DURATION_MILLIS,
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},
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currency::*,
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spec_name: Cow::Borrowed("statemine"),
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impl_name: Cow::Borrowed("statemine"),
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authoring_version: 1,
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spec_version: 2_000_003,
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spec_version: 2_000_004,
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impl_version: 0,
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apis: RUNTIME_API_VERSIONS,
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transaction_version: 15,
@@ -850,7 +852,7 @@ impl cumulus_pallet_parachain_system::Config for Runtime {
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type ConsensusHook = ConsensusHook;
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type WeightInfo = weights::cumulus_pallet_parachain_system::WeightInfo<Runtime>;
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type SelectCore = cumulus_pallet_parachain_system::DefaultCoreSelector<Runtime>;
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type RelayParentOffset = ConstU32<0>;
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type RelayParentOffset = ConstU32<RELAY_PARENT_OFFSET>;
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}
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type ConsensusHook = cumulus_pallet_aura_ext::FixedVelocityConsensusHook<
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impl cumulus_primitives_core::RelayParentOffsetApi<Block> for Runtime {
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fn relay_parent_offset() -> u32 {
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0
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RELAY_PARENT_OFFSET
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}
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}
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‎system-parachains/asset-hubs/asset-hub-kusama/src/staking/mod.rs‎

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@@ -412,8 +412,8 @@ impl pallet_staking_async::Config for Runtime {
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type EventListeners = (NominationPools, DelegatedStaking);
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// Note used; don't care.
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type MaxInvulnerables = frame_support::traits::ConstU32<20>;
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type PlanningEraOffset =
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pallet_staking_async::PlanningEraOffsetOf<Self, RelaySessionDuration, ConstU32<10>>;
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// This will start election for the next era as soon as an era starts.
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type PlanningEraOffset = ConstU32<6>;
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type RcClientInterface = StakingRcClient;
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type MaxEraDuration = MaxEraDuration;
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type WeightInfo = weights::pallet_staking_async::WeightInfo<Runtime>;
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type AHStakingInterface = Staking;
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type SendToRelayChain = StakingXcmToRelayChain;
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type MaxValidatorSetRetries = ConstU32<64>;
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// Export elected validator set at end of session 4.
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type ValidatorSetExportSession = ConstU32<4>;
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}
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#[derive(Encode, Decode)]

‎system-parachains/asset-hubs/asset-hub-polkadot/src/lib.rs‎

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@@ -191,7 +191,7 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
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impl_name: Cow::Borrowed("statemint"),
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spec_name: Cow::Borrowed("statemint"),
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authoring_version: 1,
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spec_version: 2_000_003,
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spec_version: 2_000_004,
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impl_version: 0,
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apis: RUNTIME_API_VERSIONS,
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transaction_version: 15,

‎system-parachains/asset-hubs/asset-hub-polkadot/src/staking/mod.rs‎

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@@ -389,6 +389,8 @@ impl pallet_staking_async_rc_client::Config for Runtime {
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type AHStakingInterface = Staking;
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type SendToRelayChain = StakingXcmToRelayChain;
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type MaxValidatorSetRetries = ConstU32<64>;
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// export validators as soon as election results are ready.
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type ValidatorSetExportSession = ConstU32<0>;
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}
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#[derive(Encode, Decode)]

‎system-parachains/bridge-hubs/bridge-hub-kusama/src/lib.rs‎

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spec_name: Cow::Borrowed("bridge-hub-kusama"),
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impl_name: Cow::Borrowed("bridge-hub-kusama"),
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authoring_version: 1,
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spec_version: 2_000_003,
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spec_version: 2_000_004,
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impl_version: 0,
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apis: RUNTIME_API_VERSIONS,
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transaction_version: 5,

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