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Corrected two bugs:

Browse source 
- self.node_id_vec was not properly updated when the previous ring was empty
- ClusterLayout::merge was not considering changes in the layout parameters
This commit is contained in:
Mendes 2022-10-06 12:54:51 +02:00
parent a951b6c452
commit 9407df60cc
3 changed files with 41 additions and 22 deletions
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6
src/garage/cli/layout.rs
View file

@ -189,6 +189,10 @@ pub async fn cmd_show_layout(
}
println!();
println!("==== PARAMETERS OF THE LAYOUT COMPUTATION ====");
println!("Zone redundancy: {}", layout.parameters.get().zone_redundancy);
println!();
// this will print the stats of what partitions
// will move around when we apply
match layout.calculate_partition_assignation() {
@ -267,7 +271,7 @@ pub async fn cmd_config_layout(
}
else {
layout.parameters.update(LayoutParameters{ zone_redundancy: r });
println!("The new zone redundancy has been staged.");
println!("The new zone redundancy has been saved ({}).", r);
}
}
}

48
src/rpc/layout.rs
View file

@ -150,15 +150,17 @@ impl ClusterLayout {
true
}
Ordering::Equal => {
let param_changed = self.parameters.get() != other.parameters.get();
self.parameters.merge(&other.parameters);
self.staging.merge(&other.staging);
let new_staging_hash = blake2sum(&rmp_to_vec_all_named(&self.staging).unwrap()[..]);
let changed = new_staging_hash != self.staging_hash;
let stage_changed = new_staging_hash != self.staging_hash;
self.staging_hash = new_staging_hash;
changed
stage_changed || param_changed
}
Ordering::Less => false,
}
@ -352,7 +354,7 @@ To know the correct value of the new layout version, invoke `garage layout show`
//Check that the partition size stored is the one computed by the asignation
//algorithm.
let cl2 = self.clone();
let (_ , zone_to_id) = cl2.generate_zone_ids().expect("Critical Error");
let (_ , zone_to_id) = cl2.generate_useful_zone_ids().expect("Critical Error");
let partition_size = cl2.compute_optimal_partition_size(&zone_to_id).expect("Critical Error");
if partition_size != self.partition_size {
return false;
@ -372,12 +374,13 @@ impl ClusterLayout {
/// Among such optimal assignation, it minimizes the distance to
/// the former assignation (if any) to minimize the amount of
/// data to be moved.
/// Staged changes must be merged with nodes roles before calling this function.
pub fn calculate_partition_assignation(&mut self) -> Result<Message,Error> {
//The nodes might have been updated, some might have been deleted.
//So we need to first update the list of nodes and retrieve the
//assignation.
//We update the node ids, since the node list might have changed with the staged
//We update the node ids, since the node role list might have changed with the
//changes in the layout. We retrieve the old_assignation reframed with the new ids
let old_assignation_opt = self.update_node_id_vec()?;
@ -387,12 +390,23 @@ impl ClusterLayout {
msg.push(format!("Computation of a new cluster layout where partitions are \
replicated {} times on at least {} distinct zones.", self.replication_factor, redundancy));
//We generate for once numerical ids for the zone, to use them as indices in the
//flow graphs.
let (id_to_zone , zone_to_id) = self.generate_zone_ids()?;
//We generate for once numerical ids for the zones of non gateway nodes,
//to use them as indices in the flow graphs.
let (id_to_zone , zone_to_id) = self.generate_useful_zone_ids()?;
let nb_useful_nodes = self.useful_nodes().len();
msg.push(format!("The cluster contains {} nodes spread over {} zones.",
self.useful_nodes().len(), id_to_zone.len()));
nb_useful_nodes, id_to_zone.len()));
if nb_useful_nodes < self.replication_factor{
return Err(Error::Message(format!("The number of nodes with positive \
capacity ({}) is smaller than the replication factor ({}).",
nb_useful_nodes, self.replication_factor)));
}
if id_to_zone.len() < redundancy {
return Err(Error::Message(format!("The number of zones with non-gateway \
nodes ({}) is smaller than the redundancy parameter ({})",
id_to_zone.len() , redundancy)));
}
//We compute the optimal partition size
//Capacities should be given in a unit so that partition size is at least 100.
@ -413,8 +427,7 @@ impl ClusterLayout {
if partition_size < 100 {
msg.push("WARNING: The partition size is low (< 100), you might consider to \
give the nodes capacities in a smaller unit (e.g. Mb instead of Gb) to \
achieve a more tailored use of your storage ressources.".into());
provide the nodes capacities in a smaller unit (e.g. Mb instead of Gb).".into());
}
//We compute a first flow/assignment that is heuristically close to the previous
@ -462,6 +475,8 @@ impl ClusterLayout {
new_node_id_vec.append(&mut new_non_gateway_nodes);
new_node_id_vec.append(&mut new_gateway_nodes);
let old_node_id_vec = self.node_id_vec.clone();
self.node_id_vec = new_node_id_vec.clone();
// (2) We retrieve the old association
//We rewrite the old association with the new indices. We only consider partition
@ -490,15 +505,14 @@ impl ClusterLayout {
let rf= self.replication_factor;
for p in 0..nb_partitions {
for old_id in &self.ring_assignation_data[p*rf..(p+1)*rf] {
let uuid = self.node_id_vec[*old_id as usize];
let uuid = old_node_id_vec[*old_id as usize];
if uuid_to_new_id.contains_key(&uuid) {
old_assignation[p].push(uuid_to_new_id[&uuid]);
}
}
}
//We write the results
self.node_id_vec = new_node_id_vec;
//We write the ring
self.ring_assignation_data = Vec::<CompactNodeType>::new();
return Ok(Some(old_assignation));
@ -507,11 +521,11 @@ impl ClusterLayout {
///This function generates ids for the zone of the nodes appearing in
///self.node_id_vec.
fn generate_zone_ids(&self) -> Result<(Vec<String>, HashMap<String, usize>),Error>{
fn generate_useful_zone_ids(&self) -> Result<(Vec<String>, HashMap<String, usize>),Error>{
let mut id_to_zone = Vec::<String>::new();
let mut zone_to_id = HashMap::<String,usize>::new();
for uuid in self.node_id_vec.iter() {
for uuid in self.useful_nodes().iter() {
if self.roles.get(uuid) == None {
return Err(Error::Message("The uuid was not found in the node roles (this should \
not happen, it might be a critical error).".into()));
@ -685,7 +699,7 @@ impl ClusterLayout {
storage capacities. \
You might want to rebalance the storage capacities or relax the constraints. \
See the detailed statistics below and look for saturated nodes/zones."));
msg.push(format!("Recall that because of the replication, the actual available \
msg.push(format!("Recall that because of the replication factor, the actual available \
storage capacity is {} / {} = {}.",
used_cap , self.replication_factor ,
used_cap/self.replication_factor as u32));
@ -741,7 +755,7 @@ impl ClusterLayout {
transferred.", total_new_partitions));
}
msg.push(format!(""));
msg.push(format!("Detailed statistics by zones and nodes."));
msg.push(format!("==== DETAILED STATISTICS BY ZONES AND NODES ===="));
for z in 0..id_to_zone.len(){
let mut nodes_of_z = Vec::<usize>::new();

1
src/rpc/system.rs
View file

@ -565,6 +565,7 @@ impl System {
return Err(Error::Message(msg));
}
let update_ring = self.update_ring.lock().await;
let mut layout: ClusterLayout = self.ring.borrow().layout.clone();