74 lines
2.0 KiB
Rust
74 lines
2.0 KiB
Rust
use std::sync::Arc;
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use garage_rpc::layout::*;
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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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// TODO: find a way to track layout changes for this as well
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// The hard thing is that this data is stored also on gateway nodes,
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// whereas sharded data is stored only on non-Gateway nodes (storage nodes)
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// Also we want to be more tolerant to failures of gateways so we don't
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// want to do too much holding back of data when progress of gateway
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// nodes is not reported in the layout history's ack/sync/sync_ack maps.
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/// Full replication schema: all nodes store everything
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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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/// Inconvenient: if some writes fail, nodes will read outdated data
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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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}
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impl TableReplication for TableFullReplication {
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type WriteSets = Vec<Vec<Uuid>>;
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fn storage_nodes(&self, _hash: &Hash) -> Vec<Uuid> {
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let layout = self.system.cluster_layout();
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layout.current().all_nodes().to_vec()
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}
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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_sets(&self, hash: &Hash) -> Self::WriteSets {
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vec![self.storage_nodes(hash)]
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}
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fn write_quorum(&self) -> usize {
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let nmembers = self.system.cluster_layout().current().all_nodes().len();
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let max_faults = if nmembers > 1 { 1 } else { 0 };
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if nmembers > max_faults {
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nmembers - 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 partition_of(&self, _hash: &Hash) -> Partition {
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0u16
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}
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fn sync_partitions(&self) -> SyncPartitions {
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let layout = self.system.cluster_layout();
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let layout_version = layout.current().version;
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SyncPartitions {
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layout_version,
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partitions: vec![SyncPartition {
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partition: 0u16,
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first_hash: [0u8; 32].into(),
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last_hash: [0xff; 32].into(),
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storage_sets: vec![layout.current().all_nodes().to_vec()],
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}],
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}
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}
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}
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