Merge pull request 'refactor: remove max_write_errors and max_faults' (#760) from yuka/garage:remove-max-write-errors into next-0.10

Reviewed-on: Deuxfleurs/garage#760

src/model/garage.rs

@@ -247,7 +247,6 @@ impl Garage {
 
 		let control_rep_param = TableFullReplication {
 			system: system.clone(),
-			max_faults: replication_mode.control_write_max_faults(),
 		};
 
 		info!("Initialize block manager...");

src/rpc/replication_mode.rs

@@ -21,13 +21,6 @@ impl ReplicationMode {
 		}
 	}
 
-	pub fn control_write_max_faults(&self) -> usize {
-		match self {
-			Self::None => 0,
-			_ => 1,
-		}
-	}
-
 	pub fn replication_factor(&self) -> usize {
 		match self {
 			Self::None => 1,

src/table/replication/fullcopy.rs

@@ -21,8 +21,6 @@ use crate::replication::*;
 pub struct TableFullReplication {
 	/// The membership manager of this node
 	pub system: Arc<System>,
-	/// Max number of faults allowed while replicating a record
-	pub max_faults: usize,
 }
 
 impl TableReplication for TableFullReplication {
@@ -45,15 +43,15 @@ impl TableReplication for TableFullReplication {
 	}
 	fn write_quorum(&self) -> usize {
 		let nmembers = self.system.cluster_layout().current().all_nodes().len();
-		if nmembers > self.max_faults {
+
-			nmembers - self.max_faults
+		let max_faults = if nmembers > 1 { 1 } else { 0 };
+
+		if nmembers > max_faults {
+			nmembers - max_faults
 		} else {
 			1
 		}
 	}
-	fn max_write_errors(&self) -> usize {
-		self.max_faults
-	}
 
 	fn partition_of(&self, _hash: &Hash) -> Partition {
 		0u16

src/table/replication/parameters.rs

@@ -20,7 +20,6 @@ pub trait TableReplication: Send + Sync + 'static {
 	fn write_sets(&self, hash: &Hash) -> Self::WriteSets;
 	/// Responses needed to consider a write succesfull in each set
 	fn write_quorum(&self) -> usize;
-	fn max_write_errors(&self) -> usize;
 
 	// Accessing partitions, for Merkle tree & sync
 	/// Get partition for data with given hash

src/table/replication/sharded.rs

@@ -44,9 +44,6 @@ impl TableReplication for TableShardedReplication {
 	fn write_quorum(&self) -> usize {
 		self.write_quorum
 	}
-	fn max_write_errors(&self) -> usize {
-		self.replication_factor - self.write_quorum
-	}
 
 	fn partition_of(&self, hash: &Hash) -> Partition {
 		self.system.cluster_layout().current().partition_of(hash)