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Merge pull request 'system metrics improvements' (#726) from peer-metrics into main

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Reviewed-on: Deuxfleurs/garage#726
This commit is contained in:
Alex 2024-02-20 15:35:12 +00:00
commit 885405d944
4 changed files with 412 additions and 104 deletions
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106
doc/book/reference-manual/monitoring.md
View file

@ -27,6 +27,112 @@ Exposes the Garage replication factor configured on the node
garage_replication_factor 3
```
#### `garage_local_disk_avail` and `garage_local_disk_total` (gauge)
Reports the available and total disk space on each node, for data and metadata separately.
```
garage_local_disk_avail{volume="data"} 540341960704
garage_local_disk_avail{volume="metadata"} 540341960704
garage_local_disk_total{volume="data"} 763063566336
garage_local_disk_total{volume="metadata"} 763063566336
```
### Cluster health status metrics
#### `cluster_healthy` (gauge)
Whether all storage nodes are connected (0 or 1)
```
cluster_healthy 0
```
#### `cluster_available` (gauge)
Whether all requests can be served, even if some storage nodes are disconnected
```
cluster_available 1
```
#### `cluster_connected_nodes` (gauge)
Number of nodes currently connected
```
cluster_connected_nodes 3
```
#### `cluster_known_nodes` (gauge)
Number of nodes already seen once in the cluster
```
cluster_known_nodes 3
```
#### `cluster_layout_node_connected` (gauge)
Connection status for individual nodes of the cluster layout
```
cluster_layout_node_connected{id="62b218d848e86a64",role_capacity="1000000000",role_gateway="0",role_zone="dc1"} 1
cluster_layout_node_connected{id="a11c7cf18af29737",role_capacity="1000000000",role_gateway="0",role_zone="dc1"} 0
cluster_layout_node_connected{id="a235ac7695e0c54d",role_capacity="1000000000",role_gateway="0",role_zone="dc1"} 1
cluster_layout_node_connected{id="b10c110e4e854e5a",role_capacity="1000000000",role_gateway="0",role_zone="dc1"} 1
```
#### `cluster_layout_node_disconnected_time` (gauge)
Time (in seconds) since last connection to individual nodes of the cluster layout
```
cluster_layout_node_disconnected_time{id="62b218d848e86a64",role_capacity="1000000000",role_gateway="0",role_zone="dc1"} 0
cluster_layout_node_disconnected_time{id="a235ac7695e0c54d",role_capacity="1000000000",role_gateway="0",role_zone="dc1"} 0
cluster_layout_node_disconnected_time{id="b10c110e4e854e5a",role_capacity="1000000000",role_gateway="0",role_zone="dc1"} 0
```
#### `cluster_storage_nodes` (gauge)
Number of storage nodes declared in the current layout
```
cluster_storage_nodes 4
```
#### `cluster_storage_nodes_ok` (gauge)
Number of storage nodes currently connected
```
cluster_storage_nodes_ok 3
```
#### `cluster_partitions` (gauge)
Number of partitions in the layout (this is always 256)
```
cluster_partitions 256
```
#### `cluster_partitions_all_ok` (gauge)
Number of partitions for which all storage nodes are connected
```
cluster_partitions_all_ok 64
```
#### `cluster_partitions_quorum` (gauge)
Number of partitions for which we have a quorum of connected nodes and all requests can be served
```
cluster_partitions_quorum 256
```
### Metrics of the API endpoints
#### `api_admin_request_counter` (counter)

1
src/garage/server.rs
View file

@ -162,6 +162,7 @@ pub async fn run_server(config_file: PathBuf, secrets: Secrets) -> Result<(), Er
info!("Netapp exited");
// Drop all references so that stuff can terminate properly
garage.system.cleanup();
drop(garage);
// Await for all background tasks to end

91
src/rpc/system.rs
View file

@ -3,11 +3,10 @@ use std::collections::HashMap;
use std::io::{Read, Write};
use std::net::{IpAddr, SocketAddr};
use std::path::{Path, PathBuf};
use std::sync::atomic::Ordering;
use std::sync::{Arc, RwLock};
use std::time::{Duration, Instant};
use arc_swap::ArcSwap;
use arc_swap::ArcSwapOption;
use async_trait::async_trait;
use futures::join;
use serde::{Deserialize, Serialize};
@ -88,7 +87,7 @@ pub struct System {
persist_cluster_layout: Persister<ClusterLayout>,
persist_peer_list: Persister<PeerList>,
local_status: ArcSwap<NodeStatus>,
pub(crate) local_status: RwLock<NodeStatus>,
node_status: RwLock<HashMap<Uuid, (u64, NodeStatus)>>,
pub netapp: Arc<NetApp>,
@ -106,10 +105,10 @@ pub struct System {
#[cfg(feature = "kubernetes-discovery")]
kubernetes_discovery: Option<KubernetesDiscoveryConfig>,
metrics: SystemMetrics,
metrics: ArcSwapOption<SystemMetrics>,
replication_mode: ReplicationMode,
replication_factor: usize,
pub(crate) replication_factor: usize,
/// The ring
pub ring: watch::Receiver<Arc<Ring>>,
@ -170,7 +169,7 @@ pub struct ClusterHealth {
pub partitions_all_ok: usize,
}
#[derive(Debug, Clone, Copy)]
#[derive(Debug, Clone, Copy, Eq, PartialEq)]
pub enum ClusterHealthStatus {
/// All nodes are available
Healthy,
@ -280,10 +279,8 @@ impl System {
}
};
let metrics = SystemMetrics::new(replication_factor);
let mut local_status = NodeStatus::initial(replication_factor, &cluster_layout);
local_status.update_disk_usage(&config.metadata_dir, &config.data_dir, &metrics);
local_status.update_disk_usage(&config.metadata_dir, &config.data_dir);
let ring = Ring::new(cluster_layout, replication_factor);
let (update_ring, ring) = watch::channel(Arc::new(ring));
@ -357,7 +354,7 @@ impl System {
id: netapp.id.into(),
persist_cluster_layout,
persist_peer_list,
local_status: ArcSwap::new(Arc::new(local_status)),
local_status: RwLock::new(local_status),
node_status: RwLock::new(HashMap::new()),
netapp: netapp.clone(),
peering: peering.clone(),
@ -377,14 +374,19 @@ impl System {
consul_discovery,
#[cfg(feature = "kubernetes-discovery")]
kubernetes_discovery: config.kubernetes_discovery.clone(),
metrics,
metrics: ArcSwapOption::new(None),
ring,
update_ring: Mutex::new(update_ring),
metadata_dir: config.metadata_dir.clone(),
data_dir: config.data_dir.clone(),
});
sys.system_endpoint.set_handler(sys.clone());
let metrics = SystemMetrics::new(sys.clone());
sys.metrics.store(Some(Arc::new(metrics)));
Ok(sys)
}
@ -402,6 +404,11 @@ impl System {
);
}
pub fn cleanup(&self) {
// Break reference cycle
self.metrics.store(None);
}
// ---- Administrative operations (directly available and
// also available through RPC) ----
@ -546,12 +553,9 @@ impl System {
}
};
let hostname = self.local_status.read().unwrap().hostname.clone();
if let Err(e) = c
.publish_consul_service(
self.netapp.id,
&self.local_status.load_full().hostname,
rpc_public_addr,
)
.publish_consul_service(self.netapp.id, &hostname, rpc_public_addr)
.await
{
error!("Error while publishing Consul service: {}", e);
@ -573,13 +577,8 @@ impl System {
}
};
if let Err(e) = publish_kubernetes_node(
k,
self.netapp.id,
&self.local_status.load_full().hostname,
rpc_public_addr,
)
.await
let hostname = self.local_status.read().unwrap().hostname.clone();
if let Err(e) = publish_kubernetes_node(k, self.netapp.id, &hostname, rpc_public_addr).await
{
error!("Error while publishing node to Kubernetes: {}", e);
}
@ -596,15 +595,13 @@ impl System {
}
fn update_local_status(&self) {
let mut new_si: NodeStatus = self.local_status.load().as_ref().clone();
let mut local_status = self.local_status.write().unwrap();
let ring = self.ring.borrow();
new_si.cluster_layout_version = ring.layout.version;
new_si.cluster_layout_staging_hash = ring.layout.staging_hash;
local_status.cluster_layout_version = ring.layout.version;
local_status.cluster_layout_staging_hash = ring.layout.staging_hash;
new_si.update_disk_usage(&self.metadata_dir, &self.data_dir, &self.metrics);
self.local_status.swap(Arc::new(new_si));
local_status.update_disk_usage(&self.metadata_dir, &self.data_dir);
}
// --- RPC HANDLERS ---
@ -629,7 +626,7 @@ impl System {
from: Uuid,
info: &NodeStatus,
) -> Result<SystemRpc, Error> {
let local_info = self.local_status.load();
let local_info = self.local_status.read().unwrap();
if local_info.replication_factor < info.replication_factor {
error!("Some node have a higher replication factor ({}) than this one ({}). This is not supported and will lead to data corruption. Shutting down for safety.",
@ -644,6 +641,8 @@ impl System {
tokio::spawn(self.clone().pull_cluster_layout(from));
}
drop(local_info);
self.node_status
.write()
.unwrap()
@ -707,8 +706,10 @@ impl System {
while !*stop_signal.borrow() {
let restart_at = Instant::now() + STATUS_EXCHANGE_INTERVAL;
// Update local node status that is exchanged.
self.update_local_status();
let local_status: NodeStatus = self.local_status.load().as_ref().clone();
let local_status: NodeStatus = self.local_status.read().unwrap().clone();
let _ = self
.rpc
.broadcast(
@ -904,12 +905,7 @@ impl NodeStatus {
}
}
fn update_disk_usage(
&mut self,
meta_dir: &Path,
data_dir: &DataDirEnum,
metrics: &SystemMetrics,
) {
fn update_disk_usage(&mut self, meta_dir: &Path, data_dir: &DataDirEnum) {
use nix::sys::statvfs::statvfs;
let mount_avail = |path: &Path| match statvfs(path) {
Ok(x) => {
@ -945,27 +941,6 @@ impl NodeStatus {
)
})(),
};
if let Some((avail, total)) = self.meta_disk_avail {
metrics
.values
.meta_disk_avail
.store(avail, Ordering::Relaxed);
metrics
.values
.meta_disk_total
.store(total, Ordering::Relaxed);
}
if let Some((avail, total)) = self.data_disk_avail {
metrics
.values
.data_disk_avail
.store(avail, Ordering::Relaxed);
metrics
.values
.data_disk_total
.store(total, Ordering::Relaxed);
}
}
}

318
src/rpc/system_metrics.rs
View file

@ -1,32 +1,58 @@
use std::sync::atomic::{AtomicU64, Ordering};
use std::sync::Arc;
use std::sync::{Arc, RwLock};
use std::time::{Duration, Instant};
use opentelemetry::{global, metrics::*, KeyValue};
use crate::ring::Ring;
use crate::system::{ClusterHealthStatus, System};
/// TableMetrics reference all counter used for metrics
pub struct SystemMetrics {
// Static values
pub(crate) _garage_build_info: ValueObserver<u64>,
pub(crate) _replication_factor: ValueObserver<u64>,
// Disk space values from System::local_status
pub(crate) _disk_avail: ValueObserver<u64>,
pub(crate) _disk_total: ValueObserver<u64>,
pub(crate) values: Arc<SystemMetricsValues>,
}
#[derive(Default)]
pub struct SystemMetricsValues {
pub(crate) data_disk_total: AtomicU64,
pub(crate) data_disk_avail: AtomicU64,
pub(crate) meta_disk_total: AtomicU64,
pub(crate) meta_disk_avail: AtomicU64,
// Health report from System::health()
pub(crate) _cluster_healthy: ValueObserver<u64>,
pub(crate) _cluster_available: ValueObserver<u64>,
pub(crate) _known_nodes: ValueObserver<u64>,
pub(crate) _connected_nodes: ValueObserver<u64>,
pub(crate) _storage_nodes: ValueObserver<u64>,
pub(crate) _storage_nodes_ok: ValueObserver<u64>,
pub(crate) _partitions: ValueObserver<u64>,
pub(crate) _partitions_quorum: ValueObserver<u64>,
pub(crate) _partitions_all_ok: ValueObserver<u64>,
// Status report for individual cluster nodes
pub(crate) _layout_node_connected: ValueObserver<u64>,
pub(crate) _layout_node_disconnected_time: ValueObserver<u64>,
}
impl SystemMetrics {
pub fn new(replication_factor: usize) -> Self {
pub fn new(system: Arc<System>) -> Self {
let meter = global::meter("garage_system");
let values = Arc::new(SystemMetricsValues::default());
let values1 = values.clone();
let values2 = values.clone();
let health_cache = RwLock::new((Instant::now(), system.health()));
let system2 = system.clone();
let get_health = Arc::new(move || {
{
let cache = health_cache.read().unwrap();
if cache.0 > Instant::now() - Duration::from_secs(1) {
return cache.1;
}
}
let health = system2.health();
*health_cache.write().unwrap() = (Instant::now(), health);
health
});
Self {
// Static values
_garage_build_info: meter
.u64_value_observer("garage_build_info", move |observer| {
observer.observe(
@ -39,39 +65,239 @@ impl SystemMetrics {
})
.with_description("Garage build info")
.init(),
_replication_factor: meter
.u64_value_observer("garage_replication_factor", move |observer| {
observer.observe(replication_factor as u64, &[])
_replication_factor: {
let replication_factor = system.replication_factor;
meter
.u64_value_observer("garage_replication_factor", move |observer| {
observer.observe(replication_factor as u64, &[])
})
.with_description("Garage replication factor setting")
.init()
},
// Disk space values from System::local_status
_disk_avail: {
let system = system.clone();
meter
.u64_value_observer("garage_local_disk_avail", move |observer| {
let st = system.local_status.read().unwrap();
if let Some((avail, _total)) = st.data_disk_avail {
observer.observe(avail, &[KeyValue::new("volume", "data")]);
}
if let Some((avail, _total)) = st.meta_disk_avail {
observer.observe(avail, &[KeyValue::new("volume", "metadata")]);
}
})
.with_description("Garage available disk space on each node")
.init()
},
_disk_total: {
let system = system.clone();
meter
.u64_value_observer("garage_local_disk_total", move |observer| {
let st = system.local_status.read().unwrap();
if let Some((_avail, total)) = st.data_disk_avail {
observer.observe(total, &[KeyValue::new("volume", "data")]);
}
if let Some((_avail, total)) = st.meta_disk_avail {
observer.observe(total, &[KeyValue::new("volume", "metadata")]);
}
})
.with_description("Garage total disk space on each node")
.init()
},
// Health report from System::()
_cluster_healthy: {
let get_health = get_health.clone();
meter
.u64_value_observer("cluster_healthy", move |observer| {
let h = get_health();
if h.status == ClusterHealthStatus::Healthy {
observer.observe(1, &[]);
} else {
observer.observe(0, &[]);
}
})
.with_description("Whether all storage nodes are connected")
.init()
},
_cluster_available: {
let get_health = get_health.clone();
meter.u64_value_observer("cluster_available", move |observer| {
let h = get_health();
if h.status != ClusterHealthStatus::Unavailable {
observer.observe(1, &[]);
} else {
observer.observe(0, &[]);
}
})
.with_description("Garage replication factor setting")
.init(),
_disk_avail: meter
.u64_value_observer("garage_local_disk_avail", move |observer| {
match values1.data_disk_avail.load(Ordering::Relaxed) {
0 => (),
x => observer.observe(x, &[KeyValue::new("volume", "data")]),
};
match values1.meta_disk_avail.load(Ordering::Relaxed) {
0 => (),
x => observer.observe(x, &[KeyValue::new("volume", "metadata")]),
};
})
.with_description("Garage available disk space on each node")
.init(),
_disk_total: meter
.u64_value_observer("garage_local_disk_total", move |observer| {
match values2.data_disk_total.load(Ordering::Relaxed) {
0 => (),
x => observer.observe(x, &[KeyValue::new("volume", "data")]),
};
match values2.meta_disk_total.load(Ordering::Relaxed) {
0 => (),
x => observer.observe(x, &[KeyValue::new("volume", "metadata")]),
};
})
.with_description("Garage total disk space on each node")
.init(),
values,
.with_description("Whether all requests can be served, even if some storage nodes are disconnected")
.init()
},
_known_nodes: {
let get_health = get_health.clone();
meter
.u64_value_observer("cluster_known_nodes", move |observer| {
let h = get_health();
observer.observe(h.known_nodes as u64, &[]);
})
.with_description("Number of nodes already seen once in the cluster")
.init()
},
_connected_nodes: {
let get_health = get_health.clone();
meter
.u64_value_observer("cluster_connected_nodes", move |observer| {
let h = get_health();
observer.observe(h.connected_nodes as u64, &[]);
})
.with_description("Number of nodes currently connected")
.init()
},
_storage_nodes: {
let get_health = get_health.clone();
meter
.u64_value_observer("cluster_storage_nodes", move |observer| {
let h = get_health();
observer.observe(h.storage_nodes as u64, &[]);
})
.with_description("Number of storage nodes declared in the current layout")
.init()
},
_storage_nodes_ok: {
let get_health = get_health.clone();
meter
.u64_value_observer("cluster_storage_nodes_ok", move |observer| {
let h = get_health();
observer.observe(h.storage_nodes_ok as u64, &[]);
})
.with_description("Number of storage nodes currently connected")
.init()
},
_partitions: {
let get_health = get_health.clone();
meter
.u64_value_observer("cluster_partitions", move |observer| {
let h = get_health();
observer.observe(h.partitions as u64, &[]);
})
.with_description("Number of partitions in the layout")
.init()
},
_partitions_quorum: {
let get_health = get_health.clone();
meter
.u64_value_observer("cluster_partitions_quorum", move |observer| {
let h = get_health();
observer.observe(h.partitions_quorum as u64, &[]);
})
.with_description(
"Number of partitions for which we have a quorum of connected nodes",
)
.init()
},
_partitions_all_ok: {
let get_health = get_health.clone();
meter
.u64_value_observer("cluster_partitions_all_ok", move |observer| {
let h = get_health();
observer.observe(h.partitions_all_ok as u64, &[]);
})
.with_description(
"Number of partitions for which all storage nodes are connected",
)
.init()
},
// Status report for individual cluster nodes
_layout_node_connected: {
let system = system.clone();
meter
.u64_value_observer("cluster_layout_node_connected", move |observer| {
let ring: Arc<Ring> = system.ring.borrow().clone();
let nodes = system.get_known_nodes();
for (id, _, config) in ring.layout.roles.items().iter() {
if let Some(role) = &config.0 {
let mut kv = vec![
KeyValue::new("id", format!("{:?}", id)),
KeyValue::new("role_zone", role.zone.clone()),
];
match role.capacity {
Some(cap) => {
kv.push(KeyValue::new("role_capacity", cap as i64));
kv.push(KeyValue::new("role_gateway", 0));
}
None => {
kv.push(KeyValue::new("role_gateway", 1));
}
}
let value;
if let Some(node) = nodes.iter().find(|n| n.id == *id) {
value = if node.is_up { 1 } else { 0 };
// TODO: if we add address and hostname, and those change, we
// get duplicate metrics, due to bad otel aggregation :(
// Can probably be fixed when we upgrade opentelemetry
// kv.push(KeyValue::new("address", node.addr.to_string()));
// kv.push(KeyValue::new(
// "hostname",
// node.status.hostname.clone(),
// ));
} else {
value = 0;
}
observer.observe(value, &kv);
}
}
})
.with_description("Connection status for nodes in the cluster layout")
.init()
},
_layout_node_disconnected_time: {
let system = system.clone();
meter
.u64_value_observer("cluster_layout_node_disconnected_time", move |observer| {
let ring: Arc<Ring> = system.ring.borrow().clone();
let nodes = system.get_known_nodes();
for (id, _, config) in ring.layout.roles.items().iter() {
if let Some(role) = &config.0 {
let mut kv = vec![
KeyValue::new("id", format!("{:?}", id)),
KeyValue::new("role_zone", role.zone.clone()),
];
match role.capacity {
Some(cap) => {
kv.push(KeyValue::new("role_capacity", cap as i64));
kv.push(KeyValue::new("role_gateway", 0));
}
None => {
kv.push(KeyValue::new("role_gateway", 1));
}
}
if let Some(node) = nodes.iter().find(|n| n.id == *id) {
// TODO: see comment above
// kv.push(KeyValue::new("address", node.addr.to_string()));
// kv.push(KeyValue::new(
// "hostname",
// node.status.hostname.clone(),
// ));
if node.is_up {
observer.observe(0, &kv);
} else if let Some(secs) = node.last_seen_secs_ago {
observer.observe(secs, &kv);
}
}
}
}
})
.with_description(
"Time (in seconds) since last connection to nodes in the cluster layout",
)
.init()
},
}
}
}