forked from Deuxfleurs/garage
Alex Auvolat
c94406f428
- change the terminology: the network configuration becomes the role table, the configuration of a nodes becomes a node's role - the modification of the role table takes place in two steps: first, changes are staged in a CRDT data structure. Then, once the user is happy with the changes, they can commit them all at once (or revert them). - update documentation - fix tests - implement smarter partition assignation algorithm This patch breaks the format of the network configuration: when migrating, the cluster will be in a state where no roles are assigned. All roles must be re-assigned and commited at once. This migration should not pose an issue.
51 lines
1.2 KiB
Rust
51 lines
1.2 KiB
Rust
use std::sync::Arc;
|
|
|
|
use garage_rpc::ring::*;
|
|
use garage_rpc::system::System;
|
|
use garage_util::data::*;
|
|
|
|
use crate::replication::*;
|
|
|
|
/// 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 {
|
|
/// 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 {
|
|
fn read_nodes(&self, _hash: &Hash) -> Vec<Uuid> {
|
|
vec![self.system.id]
|
|
}
|
|
fn read_quorum(&self) -> usize {
|
|
1
|
|
}
|
|
|
|
fn write_nodes(&self, _hash: &Hash) -> Vec<Uuid> {
|
|
let ring = self.system.ring.borrow();
|
|
ring.layout.node_ids().to_vec()
|
|
}
|
|
fn write_quorum(&self) -> usize {
|
|
let nmembers = self.system.ring.borrow().layout.node_ids().len();
|
|
if nmembers > self.max_faults {
|
|
nmembers - self.max_faults
|
|
} else {
|
|
1
|
|
}
|
|
}
|
|
fn max_write_errors(&self) -> usize {
|
|
self.max_faults
|
|
}
|
|
|
|
fn partition_of(&self, _hash: &Hash) -> Partition {
|
|
0u16
|
|
}
|
|
fn partitions(&self) -> Vec<(Partition, Hash)> {
|
|
vec![(0u16, [0u8; 32].into())]
|
|
}
|
|
}
|