Skip slot before creating inherent data providers during major sync

prdoc/pr_5344.prdoc

@@ -0,0 +1,10 @@
+title: Fix storage weight reclaim bug.
+
+doc:
+  - audience: Node Dev
+    description: |
+      Improvement in slot worker loop that will not call create inherent data providers if the major sync is in progress. Before it was called every slot and the results were discarded during major sync.
+
+crates:
+  - name: sc-consensus-slots
+    bump: minor

substrate/client/consensus/slots/src/lib.rs

@@ -517,16 +517,15 @@ pub async fn start_slot_worker<B, C, W, SO, CIDP, Proof>(
 	CIDP: CreateInherentDataProviders<B, ()> + Send + 'static,
 	CIDP::InherentDataProviders: InherentDataProviderExt + Send,
 {
-	let mut slots = Slots::new(slot_duration.as_duration(), create_inherent_data_providers, client);
+	let mut slots = Slots::new(
+		slot_duration.as_duration(),
+		create_inherent_data_providers,
+		client,
+		sync_oracle,
+	);
 
 	loop {
 		let slot_info = slots.next_slot().await;
-
-		if sync_oracle.is_major_syncing() {
-			debug!(target: LOG_TARGET, "Skipping proposal slot due to sync.");
-			continue
-		}
-
 		let _ = worker.on_slot(slot_info).await;
 	}
 }

substrate/client/consensus/slots/src/slots.rs

@@ -21,7 +21,7 @@
 //! This is used instead of `futures_timer::Interval` because it was unreliable.
 
 use super::{InherentDataProviderExt, Slot, LOG_TARGET};
-use sp_consensus::SelectChain;
+use sp_consensus::{SelectChain, SyncOracle};
 use sp_inherents::{CreateInherentDataProviders, InherentDataProvider};
 use sp_runtime::traits::{Block as BlockT, Header as HeaderT};
 
@@ -87,39 +87,43 @@ impl<B: BlockT> SlotInfo<B> {
 }
 
 /// A stream that returns every time there is a new slot.
-pub(crate) struct Slots<Block, SC, IDP> {
+pub(crate) struct Slots<Block, SC, IDP, SO> {
 	last_slot: Slot,
 	slot_duration: Duration,
 	until_next_slot: Option<Delay>,
 	create_inherent_data_providers: IDP,
 	select_chain: SC,
+	sync_oracle: SO,
 	_phantom: std::marker::PhantomData<Block>,
 }
 
-impl<Block, SC, IDP> Slots<Block, SC, IDP> {
+impl<Block, SC, IDP, SO> Slots<Block, SC, IDP, SO> {
 	/// Create a new `Slots` stream.
 	pub fn new(
 		slot_duration: Duration,
 		create_inherent_data_providers: IDP,
 		select_chain: SC,
+		sync_oracle: SO,
 	) -> Self {
 		Slots {
 			last_slot: 0.into(),
 			slot_duration,
 			until_next_slot: None,
 			create_inherent_data_providers,
 			select_chain,
+			sync_oracle,
 			_phantom: Default::default(),
 		}
 	}
 }
 
-impl<Block, SC, IDP> Slots<Block, SC, IDP>
+impl<Block, SC, IDP, SO> Slots<Block, SC, IDP, SO>
 where
 	Block: BlockT,
 	SC: SelectChain<Block>,
 	IDP: CreateInherentDataProviders<Block, ()> + 'static,
 	IDP::InherentDataProviders: crate::InherentDataProviderExt,
+	SO: SyncOracle,
 {
 	/// Returns a future that fires when the next slot starts.
 	pub async fn next_slot(&mut self) -> SlotInfo<Block> {
@@ -138,6 +142,11 @@ where
 			let wait_dur = time_until_next_slot(self.slot_duration);
 			self.until_next_slot = Some(Delay::new(wait_dur));
 
+			if self.sync_oracle.is_major_syncing() {
+				log::debug!(target: LOG_TARGET, "Skipping slot: major sync is in progress.");
+				continue;
+			}
+
 			let chain_head = match self.select_chain.best_chain().await {
 				Ok(x) => x,
 				Err(e) => {