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Improve how node roles are assigned in Garage

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- 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.
This commit is contained in:
Alex Auvolat
2021-11-09 12:24:04 +01:00
parent 53888995bd
commit c94406f428
42 changed files with 1430 additions and 557 deletions
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src/table/replication/fullcopy.rs
+2 -2
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@@ -28,10 +28,10 @@ impl TableReplication for TableFullReplication {
fn write_nodes(&self, _hash: &Hash) -> Vec<Uuid> {
let ring = self.system.ring.borrow();
ring.config.members.keys().cloned().collect::<Vec<_>>()
ring.layout.node_ids().to_vec()
}
fn write_quorum(&self) -> usize {
let nmembers = self.system.ring.borrow().config.members.len();
let nmembers = self.system.ring.borrow().layout.node_ids().len();
if nmembers > self.max_faults {
nmembers - self.max_faults
} else {