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Improved the statistics displayed in layout show

Browse source 
corrected a few bugs
This commit is contained in:
Mendes 2022-10-11 17:17:13 +02:00
parent 4abab246f1
commit e5664c9822
2 changed files with 111 additions and 63 deletions
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69
src/garage/cli/layout.rs
View file

@ -169,7 +169,7 @@ pub async fn cmd_show_layout(
rpc_cli: &Endpoint<SystemRpc, ()>,
rpc_host: NodeID,
) -> Result<(), Error> {
let mut layout = fetch_layout(rpc_cli, rpc_host).await?;
let layout = fetch_layout(rpc_cli, rpc_host).await?;
println!("==== CURRENT CLUSTER LAYOUT ====");
if !print_cluster_layout(&layout) {
@ -179,41 +179,40 @@ pub async fn cmd_show_layout(
println!();
println!("Current cluster layout version: {}", layout.version);
if print_staging_role_changes(&layout) {
layout.roles.merge(&layout.staging);
println!();
println!("==== NEW CLUSTER LAYOUT AFTER APPLYING CHANGES ====");
if !print_cluster_layout(&layout) {
println!("No nodes have a role in the new layout.");
}
println!();
println!("==== PARAMETERS OF THE LAYOUT COMPUTATION ====");
println!(
"Zone redundancy: {}",
layout.staged_parameters.get().zone_redundancy
);
println!();
let has_role_changes = print_staging_role_changes(&layout);
let has_param_changes = print_staging_parameters_changes(&layout);
if has_role_changes || has_param_changes {
let v = layout.version;
let res_apply = layout.apply_staged_changes(Some(v + 1));
// this will print the stats of what partitions
// will move around when we apply
match layout.calculate_partition_assignation() {
Ok(msg) => {
match res_apply {
Ok((layout, msg)) => {
println!();
println!("==== NEW CLUSTER LAYOUT AFTER APPLYING CHANGES ====");
if !print_cluster_layout(&layout) {
println!("No nodes have a role in the new layout.");
}
println!();
for line in msg.iter() {
println!("{}", line);
}
println!("To enact the staged role changes, type:");
println!();
println!(" garage layout apply --version {}", layout.version + 1);
println!(" garage layout apply --version {}", v + 1);
println!();
println!(
"You can also revert all proposed changes with: garage layout revert --version {}",
layout.version + 1)
v + 1)
}
Err(Error::Message(s)) => {
println!("Error while trying to compute the assignation: {}", s);
println!("This new layout cannot yet be applied.");
println!(
"You can also revert all proposed changes with: garage layout revert --version {}",
v + 1)
}
_ => {
println!("Unknown Error");
@ -321,21 +320,29 @@ pub async fn send_layout(
}
pub fn print_cluster_layout(layout: &ClusterLayout) -> bool {
let mut table = vec!["ID\tTags\tZone\tCapacity".to_string()];
let mut table = vec!["ID\tTags\tZone\tCapacity\tUsable".to_string()];
for (id, _, role) in layout.roles.items().iter() {
let role = match &role.0 {
Some(r) => r,
_ => continue,
};
let tags = role.tags.join(",");
let usage = layout.get_node_usage(id).unwrap_or(0);
let capacity = layout.get_node_capacity(id).unwrap_or(1);
table.push(format!(
"{:?}\t{}\t{}\t{}",
"{:?}\t{}\t{}\t{}\t{} ({:.1}%)",
id,
tags,
role.zone,
role.capacity_string()
role.capacity_string(),
usage as u32 * layout.partition_size,
(100.0 * usage as f32 * layout.partition_size as f32) / (capacity as f32)
));
}
println!();
println!("Parameters of the layout computation:");
println!("Zone redundancy: {}", layout.parameters.zone_redundancy);
println!();
if table.len() == 1 {
false
} else {
@ -344,6 +351,20 @@ pub fn print_cluster_layout(layout: &ClusterLayout) -> bool {
}
}
pub fn print_staging_parameters_changes(layout: &ClusterLayout) -> bool {
let has_changes = layout.staged_parameters.get().clone() != layout.parameters;
if has_changes {
println!();
println!("==== NEW LAYOUT PARAMETERS ====");
println!(
"Zone redundancy: {}",
layout.staged_parameters.get().zone_redundancy
);
println!();
}
has_changes
}
pub fn print_staging_role_changes(layout: &ClusterLayout) -> bool {
let has_changes = layout
.staging

105
src/rpc/layout.rs
View file

@ -205,6 +205,7 @@ To know the correct value of the new layout version, invoke `garage layout show`
self.staging.clear();
self.staging_hash = blake2sum(&rmp_to_vec_all_named(&self.staging).unwrap()[..]);
self.staged_parameters.update(self.parameters.clone());
self.version += 1;
@ -267,6 +268,26 @@ To know the correct value of the new layout version, invoke `garage layout show`
}
}
///Returns the number of partitions associated to this node in the ring
pub fn get_node_usage(&self, uuid: &Uuid) -> Result<usize, Error> {
for (i, id) in self.node_id_vec.iter().enumerate() {
if id == uuid {
let mut count = 0;
for nod in self.ring_assignation_data.iter() {
if i as u8 == *nod {
count += 1
}
}
return Ok(count);
}
}
Err(Error::Message(
"The Uuid does not correspond to a node present in the \
cluster or this node does not have a positive capacity."
.into(),
))
}
///Returns the sum of capacities of non gateway nodes in the cluster
pub fn get_total_capacity(&self) -> Result<u32, Error> {
let mut total_capacity = 0;
@ -357,11 +378,10 @@ To know the correct value of the new layout version, invoke `garage layout show`
//algorithm.
let cl2 = self.clone();
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;
match cl2.compute_optimal_partition_size(&zone_to_id) {
Ok(s) if s != self.partition_size => return false,
Err(_) => return false,
_ => (),
}
true
@ -376,8 +396,9 @@ 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> {
// Staged role changes must be merged with nodes roles before calling this function,
// hence it must only be called from apply_staged_changes() and it is not public.
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.
@ -386,13 +407,15 @@ impl ClusterLayout {
//changes in the layout. We retrieve the old_assignation reframed with the new ids
let old_assignation_opt = self.update_node_id_vec()?;
let redundancy = self.staged_parameters.get().zone_redundancy;
self.parameters = self.staged_parameters.get().clone();
let mut msg = Message::new();
msg.push("==== COMPUTATION OF A NEW PARTITION ASSIGNATION ====".into());
msg.push("".into());
msg.push(format!(
"Computation of a new cluster layout where partitions are \
"Partitions are \
replicated {} times on at least {} distinct zones.",
self.replication_factor, redundancy
self.replication_factor, self.parameters.zone_redundancy
));
//We generate for once numerical ids for the zones of non gateway nodes,
@ -400,11 +423,6 @@ impl ClusterLayout {
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.",
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 \
@ -412,12 +430,12 @@ impl ClusterLayout {
nb_useful_nodes, self.replication_factor
)));
}
if id_to_zone.len() < redundancy {
if id_to_zone.len() < self.parameters.zone_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
self.parameters.zone_redundancy
)));
}
@ -429,10 +447,8 @@ impl ClusterLayout {
if old_assignation_opt != None {
msg.push(format!(
"Given the replication and redundancy constraint, the \
optimal size of a partition is {}. In the previous layout, it used to \
be {} (the zone redundancy was {}).",
partition_size, self.partition_size, self.parameters.zone_redundancy
"Optimal size of a partition: {} (was {} in the previous layout).",
partition_size, self.partition_size
));
} else {
msg.push(format!(
@ -442,7 +458,6 @@ impl ClusterLayout {
));
}
self.partition_size = partition_size;
self.parameters = self.staged_parameters.get().clone();
if partition_size < 100 {
msg.push(
@ -470,6 +485,13 @@ impl ClusterLayout {
//We update the layout structure
self.update_ring_from_flow(id_to_zone.len(), &gflow)?;
if !self.check() {
return Err(Error::Message(
"Critical error: The computed layout happens to be incorrect".into(),
));
}
Ok(msg)
}
@ -553,12 +575,6 @@ impl ClusterLayout {
//We write the ring
self.ring_assignation_data = Vec::<CompactNodeType>::new();
if !self.check() {
return Err(Error::Message(
"Critical error: The computed layout happens to be incorrect".into(),
));
}
Ok(Some(old_assignation))
}
@ -652,7 +668,7 @@ impl ClusterLayout {
ClusterLayout::generate_graph_vertices(zone_to_id.len(), self.useful_nodes().len());
let mut g = Graph::<FlowEdge>::new(&vertices);
let nb_zones = zone_to_id.len();
let redundancy = self.staged_parameters.get().zone_redundancy;
let redundancy = self.parameters.zone_redundancy;
for p in 0..NB_PARTITIONS {
g.add_edge(Vertex::Source, Vertex::Pup(p), redundancy as u32)?;
g.add_edge(
@ -774,8 +790,9 @@ impl ClusterLayout {
let used_cap = self.partition_size * nb_partitions as u32 * self.replication_factor as u32;
let total_cap = self.get_total_capacity()?;
let percent_cap = 100.0 * (used_cap as f32) / (total_cap as f32);
msg.push("".into());
msg.push(format!(
"Available capacity / Total cluster capacity: {} / {} ({:.1} %)",
"Usable capacity / Total cluster capacity: {} / {} ({:.1} %)",
used_cap, total_cap, percent_cap
));
msg.push("".into());
@ -878,7 +895,7 @@ impl ClusterLayout {
}
let percent_cap_z = 100.0 * (available_cap_z as f32) / (total_cap_z as f32);
msg.push(format!(
" Available capacity / Total capacity: {}/{} ({:.1}%).",
" Usable capacity / Total capacity: {}/{} ({:.1}%).",
available_cap_z, total_cap_z, percent_cap_z
));
@ -891,7 +908,7 @@ impl ClusterLayout {
.tags_string();
msg.push(format!(
" Node {}: {} partitions ({} new) ; \
available/total capacity: {} / {} ({:.1}%) ; tags:{}",
usable/total capacity: {} / {} ({:.1}%) ; tags:{}",
&self.node_id_vec[*n].to_vec()[0..2]
.to_vec()
.encode_hex::<String>(),
@ -1008,7 +1025,7 @@ mod tests {
cl.node_id_vec.push(x);
}
let update = cl.roles.update_mutator(
let update = cl.staging.update_mutator(
cl.node_id_vec[i],
NodeRoleV(Some(NodeRole {
zone: (node_zone_vec[i].to_string()),
@ -1016,9 +1033,11 @@ mod tests {
tags: (vec![]),
})),
);
cl.roles.merge(&update);
cl.staging.merge(&update);
}
cl.staged_parameters = Lww::<LayoutParameters>::new(LayoutParameters { zone_redundancy });
cl.staging_hash = blake2sum(&rmp_to_vec_all_named(&cl.staging).unwrap()[..]);
cl.staged_parameters
.update(LayoutParameters { zone_redundancy });
}
#[test]
@ -1032,7 +1051,9 @@ mod tests {
let mut cl = ClusterLayout::new(3);
update_layout(&mut cl, &node_id_vec, &node_capacity_vec, &node_zone_vec, 3);
show_msg(&cl.calculate_partition_assignation().unwrap());
let v = cl.version;
let (mut cl, msg) = cl.apply_staged_changes(Some(v + 1)).unwrap();
show_msg(&msg);
assert!(cl.check());
assert!(matches!(check_against_naive(&cl), Ok(true)));
@ -1043,13 +1064,17 @@ mod tests {
.map(|x| x.to_string())
.collect();
update_layout(&mut cl, &node_id_vec, &node_capacity_vec, &node_zone_vec, 2);
show_msg(&cl.calculate_partition_assignation().unwrap());
let v = cl.version;
let (mut cl, msg) = cl.apply_staged_changes(Some(v + 1)).unwrap();
show_msg(&msg);
assert!(cl.check());
assert!(matches!(check_against_naive(&cl), Ok(true)));
node_capacity_vec = vec![4000, 1000, 2000, 7000, 1000, 1000, 2000, 10000, 2000];
update_layout(&mut cl, &node_id_vec, &node_capacity_vec, &node_zone_vec, 3);
show_msg(&cl.calculate_partition_assignation().unwrap());
let v = cl.version;
let (mut cl, msg) = cl.apply_staged_changes(Some(v + 1)).unwrap();
show_msg(&msg);
assert!(cl.check());
assert!(matches!(check_against_naive(&cl), Ok(true)));
@ -1057,7 +1082,9 @@ mod tests {
4000000, 4000000, 2000000, 7000000, 1000000, 9000000, 2000000, 10000, 2000000,
];
update_layout(&mut cl, &node_id_vec, &node_capacity_vec, &node_zone_vec, 1);
show_msg(&cl.calculate_partition_assignation().unwrap());
let v = cl.version;
let (cl, msg) = cl.apply_staged_changes(Some(v + 1)).unwrap();
show_msg(&msg);
assert!(cl.check());
assert!(matches!(check_against_naive(&cl), Ok(true)));
}