Alex
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.
52 lines
1.2 KiB
Rust
52 lines
1.2 KiB
Rust
use std::sync::Arc;
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use garage_rpc::ring::*;
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use garage_rpc::system::System;
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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
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/// Writes are disseminated in an epidemic manner in the network
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/// Advantage: do all reads locally, extremely fast
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/// Inconvenient: only suitable to reasonably small tables
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#[derive(Clone)]
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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
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pub max_faults: usize,
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}
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impl TableReplication for TableFullReplication {
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fn read_nodes(&self, _hash: &Hash) -> Vec<Uuid> {
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vec![self.system.id]
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}
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fn read_quorum(&self) -> usize {
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1
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}
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fn write_nodes(&self, _hash: &Hash) -> Vec<Uuid> {
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let ring = self.system.ring.borrow();
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ring.layout.node_ids().to_vec()
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}
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fn write_quorum(&self) -> usize {
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let nmembers = self.system.ring.borrow().layout.node_ids().len();
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if nmembers > self.max_faults {
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nmembers - self.max_faults
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} else {
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1
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}
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}
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fn max_write_errors(&self) -> usize {
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self.max_faults
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}
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fn partition_of(&self, _hash: &Hash) -> Partition {
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0u16
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}
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fn partitions(&self) -> Vec<(Partition, Hash)> {
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vec![(0u16, [0u8; 32].into())]
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}
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}
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