garage/src/table/replication/fullcopy.rs

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Rust
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use std::sync::Arc;
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use garage_rpc::membership::System;
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use garage_rpc::ring::*;
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use garage_util::data::*;
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use crate::replication::*;
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/// Full replication schema: all nodes store everything
/// Writes are disseminated in an epidemic manner in the network
/// Advantage: do all reads locally, extremely fast
/// Inconvenient: only suitable to reasonably small tables
#[derive(Clone)]
pub struct TableFullReplication {
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/// The membership manager of this node
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pub system: Arc<System>,
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/// Max number of faults allowed while replicating a record
pub max_faults: usize,
}
impl TableReplication for TableFullReplication {
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fn read_nodes(&self, _hash: &Hash) -> Vec<Uuid> {
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vec![self.system.id]
}
fn read_quorum(&self) -> usize {
1
}
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fn write_nodes(&self, _hash: &Hash) -> Vec<Uuid> {
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let ring = self.system.ring.borrow();
ring.config.members.keys().cloned().collect::<Vec<_>>()
}
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fn write_quorum(&self) -> usize {
let nmembers = self.system.ring.borrow().config.members.len();
if nmembers > self.max_faults {
nmembers - self.max_faults
} else {
1
}
}
fn max_write_errors(&self) -> usize {
self.max_faults
}
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fn partition_of(&self, _hash: &Hash) -> Partition {
0u16
}
fn partitions(&self) -> Vec<(Partition, Hash)> {
vec![(0u16, [0u8; 32].into())]
}
}