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-rw-r--r--src/table/table_sharded.rs55
1 files changed, 55 insertions, 0 deletions
diff --git a/src/table/table_sharded.rs b/src/table/table_sharded.rs
new file mode 100644
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+++ b/src/table/table_sharded.rs
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+use crate::data::*;
+use crate::rpc::membership::{Ring, System};
+use crate::table::*;
+
+#[derive(Clone)]
+pub struct TableShardedReplication {
+ pub replication_factor: usize,
+ pub read_quorum: usize,
+ pub write_quorum: usize,
+}
+
+impl TableReplication for TableShardedReplication {
+ // Sharded replication schema:
+ // - based on the ring of nodes, a certain set of neighbors
+ // store entries, given as a function of the position of the
+ // entry's hash in the ring
+ // - reads are done on all of the nodes that replicate the data
+ // - writes as well
+
+ fn read_nodes(&self, hash: &Hash, system: &System) -> Vec<UUID> {
+ let ring = system.ring.borrow().clone();
+ ring.walk_ring(&hash, self.replication_factor)
+ }
+ fn read_quorum(&self) -> usize {
+ self.read_quorum
+ }
+
+ fn write_nodes(&self, hash: &Hash, system: &System) -> Vec<UUID> {
+ let ring = system.ring.borrow().clone();
+ ring.walk_ring(&hash, self.replication_factor)
+ }
+ fn write_quorum(&self) -> usize {
+ self.write_quorum
+ }
+ fn max_write_errors(&self) -> usize {
+ self.replication_factor - self.write_quorum
+ }
+ fn epidemic_writes(&self) -> bool {
+ false
+ }
+
+ fn replication_nodes(&self, hash: &Hash, ring: &Ring) -> Vec<UUID> {
+ ring.walk_ring(&hash, self.replication_factor)
+ }
+ fn split_points(&self, ring: &Ring) -> Vec<Hash> {
+ let mut ret = vec![];
+
+ ret.push([0u8; 32].into());
+ for entry in ring.ring.iter() {
+ ret.push(entry.location);
+ }
+ ret.push([0xFFu8; 32].into());
+ ret
+ }
+}