src/rpc/layout/history.rs

@@ -9,6 +9,7 @@ use garage_util::error::*;
 use super::schema::*;
 use super::*;
 
+
 impl LayoutHistory {
 	pub fn new(replication_factor: usize) -> Self {
 		let version = LayoutVersion::new(replication_factor);
@@ -49,7 +50,7 @@ impl LayoutHistory {
 	// ------------------ who stores what now? ---------------
 
 	pub fn all_ack(&self) -> u64 {
-		self.calculate_global_min(&self.update_trackers.ack_map)
+		self.update_trackers.ack_map.current_min
 	}
 
 	pub fn min_stored(&self) -> u64 {
@@ -91,7 +92,7 @@ impl LayoutHistory {
 	}
 
 	pub fn read_nodes_of(&self, position: &Hash) -> Vec<Uuid> {
-		let sync_min = self.calculate_global_min(&self.update_trackers.sync_map);
+		let sync_min = self.update_trackers.sync_map.current_min;
 		let version = self
 			.versions
 			.iter()
@@ -122,7 +123,7 @@ impl LayoutHistory {
 
 	// ------------------ update tracking ---------------
 
-	pub(crate) fn update_trackers(&mut self, node_id: Uuid) {
+	pub(crate) fn update_trackers_of(&mut self, node_id: Uuid) {
 		// Ensure trackers for this node's values are up-to-date
 
 		// 1. Acknowledge the last layout version in the history
@@ -138,6 +139,9 @@ impl LayoutHistory {
 		// 4. Cleanup layout versions that are not needed anymore
 		self.cleanup_old_versions();
 
+		// 5. Recalculate global minima
+		self.update_trackers_min();
+
 		info!("ack_map: {:?}", self.update_trackers.ack_map);
 		info!("sync_map: {:?}", self.update_trackers.sync_map);
 		info!("sync_ack_map: {:?}", self.update_trackers.sync_ack_map);
@@ -146,42 +150,41 @@ impl LayoutHistory {
 		self.update_hashes();
 	}
 
+	fn update_trackers_min(&mut self) {
+		// TODO: for TableFullReplication, counting gateway nodes might be
+		// necessary? Think about this more.
+		let storage_nodes = self.all_nongateway_nodes().into_owned();
+		let min_version = self.versions.first().unwrap().version;
+		self.update_trackers.update_min(&storage_nodes, min_version);
+	}
+
 	pub(crate) fn ack_last(&mut self, node: Uuid) {
 		let last_version = self.current().version;
 		self.update_trackers.ack_map.set_max(node, last_version);
+		self.update_trackers_min();
 	}
 
 	pub(crate) fn sync_first(&mut self, node: Uuid) {
 		let first_version = self.versions.first().as_ref().unwrap().version;
 		self.update_trackers.sync_map.set_max(node, first_version);
+		self.update_trackers_min();
 	}
 
 	pub(crate) fn sync_ack(&mut self, node: Uuid) {
-		self.update_trackers.sync_ack_map.set_max(
-			node,
-			self.calculate_global_min(&self.update_trackers.sync_map),
-		);
+		self.update_trackers
+			.sync_ack_map
+			.set_max(node, self.update_trackers.sync_map.current_min);
+		self.update_trackers_min();
 	}
 
 	pub(crate) fn cleanup_old_versions(&mut self) {
-		let min_sync_ack = self.calculate_global_min(&self.update_trackers.sync_ack_map);
+		let min_sync_ack = self.update_trackers.sync_ack_map.current_min;
 		while self.versions.first().as_ref().unwrap().version < min_sync_ack {
 			let removed = self.versions.remove(0);
 			info!("Layout history: pruning old version {}", removed.version);
 		}
 	}
 
-	pub(crate) fn calculate_global_min(&self, tracker: &UpdateTracker) -> u64 {
-		// TODO: for TableFullReplication, counting gateway nodes might be
-		// necessary? Think about this more.
-		let storage_nodes = self.all_nongateway_nodes();
-		storage_nodes
-			.iter()
-			.map(|x| tracker.0.get(x).copied().unwrap_or(0))
-			.min()
-			.unwrap_or(0)
-	}
-
 	// ================== updates to layout, public interface ===================
 
 	pub fn merge(&mut self, other: &LayoutHistory) -> bool {
@@ -229,6 +232,11 @@ impl LayoutHistory {
 			}
 		}
 
+		// Update the current_min value in trackers if anything changed
+		if changed {
+			self.update_trackers_min();
+		}
+
 		// Merge staged layout changes
 		if self.staging != other.staging {
 			self.staging.merge(&other.staging);

src/rpc/layout/manager.rs

@@ -74,7 +74,7 @@ impl LayoutManager {
 			}
 		};
 
-		cluster_layout.update_trackers(node_id.into());
+		cluster_layout.update_trackers_of(node_id.into());
 
 		let layout = Arc::new(RwLock::new(cluster_layout));
 		let change_notify = Arc::new(Notify::new());
@@ -158,7 +158,7 @@ impl LayoutManager {
 
 		if !prev_layout_check || adv.check().is_ok() {
 			if layout.merge(adv) {
-				layout.update_trackers(self.node_id);
+				layout.update_trackers_of(self.node_id);
 				if prev_layout_check && layout.check().is_err() {
 					panic!("Merged two correct layouts and got an incorrect layout.");
 				}
@@ -172,7 +172,7 @@ impl LayoutManager {
 		let mut layout = self.layout.write().unwrap();
 		if layout.update_trackers != *adv {
 			if layout.update_trackers.merge(adv) {
-				layout.update_trackers(self.node_id);
+				layout.update_trackers_of(self.node_id);
 				return Some(layout.update_trackers.clone());
 			}
 		}

src/rpc/layout/schema.rs

@@ -260,7 +260,10 @@ mod v010 {
 
 	/// The history of cluster layouts
 	#[derive(Clone, Debug, Serialize, Deserialize, Default, PartialEq)]
-	pub struct UpdateTracker(pub BTreeMap<Uuid, u64>);
+	pub struct UpdateTracker {
+		pub values: BTreeMap<Uuid, u64>,
+		pub current_min: u64,
+	}
 
 	impl garage_util::migrate::Migrate for LayoutHistory {
 		const VERSION_MARKER: &'static [u8] = b"G010lh";
@@ -290,14 +293,15 @@ mod v010 {
 				nongateway_node_count,
 				ring_assignment_data: previous.ring_assignment_data,
 			};
-			let update_tracker = UpdateTracker(
-				version
+			let update_tracker = UpdateTracker {
+				values: version
 					.nongateway_nodes()
 					.iter()
 					.copied()
 					.map(|x| (x, version.version))
 					.collect::<BTreeMap<Uuid, u64>>(),
-			);
+				current_min: 0,
+			};
 			let staging = LayoutStaging {
 				parameters: previous.staging_parameters,
 				roles: previous.staging_roles,
@@ -378,14 +382,14 @@ impl core::str::FromStr for ZoneRedundancy {
 impl UpdateTracker {
 	fn merge(&mut self, other: &UpdateTracker) -> bool {
 		let mut changed = false;
-		for (k, v) in other.0.iter() {
-			if let Some(v_mut) = self.0.get_mut(k) {
+		for (k, v) in other.values.iter() {
+			if let Some(v_mut) = self.values.get_mut(k) {
 				if *v > *v_mut {
 					*v_mut = *v;
 					changed = true;
 				}
 			} else {
-				self.0.insert(*k, *v);
+				self.values.insert(*k, *v);
 				changed = true;
 			}
 		}
@@ -393,18 +397,26 @@ impl UpdateTracker {
 	}
 
 	pub(crate) fn set_max(&mut self, peer: Uuid, value: u64) -> bool {
-		match self.0.get_mut(&peer) {
+		match self.values.get_mut(&peer) {
 			Some(e) if *e < value => {
 				*e = value;
 				true
 			}
 			None => {
-				self.0.insert(peer, value);
+				self.values.insert(peer, value);
 				true
 			}
 			_ => false,
 		}
 	}
+
+	fn update_min(&mut self, storage_nodes: &[Uuid], min_version: u64) {
+		self.current_min = storage_nodes
+			.iter()
+			.map(|x| self.values.get(x).copied().unwrap_or(min_version))
+			.min()
+			.unwrap_or(min_version)
+	}
 }
 
 impl UpdateTrackers {
@@ -414,4 +426,10 @@ impl UpdateTrackers {
 		let c3 = self.sync_ack_map.merge(&other.sync_ack_map);
 		c1 || c2 || c3
 	}
+
+	pub(crate) fn update_min(&mut self, storage_nodes: &[Uuid], min_version: u64) {
+		self.ack_map.update_min(&storage_nodes, min_version);
+		self.sync_map.update_min(&storage_nodes, min_version);
+		self.sync_ack_map.update_min(&storage_nodes, min_version);
+	}
 }