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metrics.go
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metrics.go
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package scheduler
import (
"context"
"strings"
"sync/atomic"
"time"
"github.com/google/uuid"
"github.com/prometheus/client_golang/prometheus"
log "github.com/sirupsen/logrus"
"k8s.io/apimachinery/pkg/util/clock"
commonmetrics "github.com/armadaproject/armada/internal/common/metrics"
"github.com/armadaproject/armada/internal/common/resource"
"github.com/armadaproject/armada/internal/scheduler/database"
"github.com/armadaproject/armada/internal/scheduler/jobdb"
"github.com/armadaproject/armada/internal/scheduler/schedulerobjects"
)
// Metrics Recorders associated with a queue
type queueState struct {
queuedJobRecorder *commonmetrics.JobMetricsRecorder
runningJobRecorder *commonmetrics.JobMetricsRecorder
}
// metricProvider is a simple implementation of QueueMetricProvider
type metricProvider struct {
queueStates map[string]*queueState
}
func (m metricProvider) GetQueuedJobMetrics(queueName string) []*commonmetrics.QueueMetrics {
state, ok := m.queueStates[queueName]
if ok {
return state.queuedJobRecorder.Metrics()
}
return nil
}
func (m metricProvider) GetRunningJobMetrics(queueName string) []*commonmetrics.QueueMetrics {
state, ok := m.queueStates[queueName]
if ok {
return state.runningJobRecorder.Metrics()
}
return nil
}
// MetricsCollector is a Prometheus Collector that handles scheduler metrics.
// The metrics themselves are calculated asynchronously every refreshPeriod
type MetricsCollector struct {
jobDb *jobdb.JobDb
queueRepository database.QueueRepository
executorRepository database.ExecutorRepository
poolAssigner PoolAssigner
refreshPeriod time.Duration
clock clock.Clock
state atomic.Value
}
func NewMetricsCollector(
jobDb *jobdb.JobDb,
queueRepository database.QueueRepository,
executorRepository database.ExecutorRepository,
poolAssigner PoolAssigner,
refreshPeriod time.Duration,
) *MetricsCollector {
return &MetricsCollector{
jobDb: jobDb,
queueRepository: queueRepository,
executorRepository: executorRepository,
poolAssigner: poolAssigner,
refreshPeriod: refreshPeriod,
clock: clock.RealClock{},
state: atomic.Value{},
}
}
// Run enters s a loop which updates the metrics every refreshPeriod until the supplied context is cancelled
func (c *MetricsCollector) Run(ctx context.Context) error {
ticker := c.clock.NewTicker(c.refreshPeriod)
log.Infof("Will update metrics every %s", c.refreshPeriod)
for {
select {
case <-ctx.Done():
log.Debugf("Context cancelled, returning..")
return nil
case <-ticker.C():
err := c.refresh(ctx)
if err != nil {
log.WithError(err).Warnf("error refreshing metrics state")
}
}
}
}
// Describe returns all descriptions of the collector.
func (c *MetricsCollector) Describe(out chan<- *prometheus.Desc) {
commonmetrics.Describe(out)
}
// Collect returns the current state of all metrics of the collector.
func (c *MetricsCollector) Collect(metrics chan<- prometheus.Metric) {
state, ok := c.state.Load().([]prometheus.Metric)
if ok {
for _, m := range state {
metrics <- m
}
}
}
func (c *MetricsCollector) refresh(ctx context.Context) error {
log.Debugf("Refreshing prometheus metrics")
start := time.Now()
queueMetrics, err := c.updateQueueMetrics(ctx)
if err != nil {
return err
}
clusterMetrics, err := c.updateClusterMetrics(ctx)
if err != nil {
return err
}
allMetrics := append(queueMetrics, clusterMetrics...)
c.state.Store(allMetrics)
log.Debugf("Refreshed prometheus metrics in %s", time.Since(start))
return nil
}
func (c *MetricsCollector) updateQueueMetrics(ctx context.Context) ([]prometheus.Metric, error) {
queues, err := c.queueRepository.GetAllQueues()
if err != nil {
return nil, err
}
provider := metricProvider{queueStates: make(map[string]*queueState, len(queues))}
queuedJobsCount := make(map[string]int, len(queues))
for _, queue := range queues {
provider.queueStates[queue.Name] = &queueState{
queuedJobRecorder: commonmetrics.NewJobMetricsRecorder(),
runningJobRecorder: commonmetrics.NewJobMetricsRecorder(),
}
queuedJobsCount[queue.Name] = 0
}
err = c.poolAssigner.Refresh(ctx)
if err != nil {
return nil, err
}
currentTime := c.clock.Now()
for _, job := range c.jobDb.GetAll(c.jobDb.ReadTxn()) {
// Don't calculate metrics for dead jobs
if job.InTerminalState() {
continue
}
qs, ok := provider.queueStates[job.Queue()]
if !ok {
log.Warnf("job %s is in queue %s, but this queue does not exist; skipping", job.Id(), job.Queue())
continue
}
pool, err := c.poolAssigner.AssignPool(job)
if err != nil {
return nil, err
}
priorityClass := job.JobSchedulingInfo().PriorityClassName
resourceRequirements := job.JobSchedulingInfo().GetObjectRequirements()[0].GetPodRequirements().GetResourceRequirements().Requests
jobResources := make(map[string]float64)
for key, value := range resourceRequirements {
jobResources[string(key)] = resource.QuantityAsFloat64(value)
}
var recorder *commonmetrics.JobMetricsRecorder
var timeInState time.Duration
if job.Queued() {
recorder = qs.queuedJobRecorder
timeInState = currentTime.Sub(time.Unix(0, job.Created()))
queuedJobsCount[job.Queue()]++
} else if job.HasRuns() {
run := job.LatestRun()
timeInState = currentTime.Sub(time.Unix(0, run.Created()))
recorder = qs.runningJobRecorder
} else {
log.Warnf("Job %s is marked as leased but has no runs", job.Id())
}
recorder.RecordJobRuntime(pool, priorityClass, timeInState)
recorder.RecordResources(pool, priorityClass, jobResources)
}
queueMetrics := commonmetrics.CollectQueueMetrics(queuedJobsCount, provider)
return queueMetrics, nil
}
type queueMetricKey struct {
cluster string
pool string
queueName string
nodeType string
}
type queuePhaseMetricKey struct {
cluster string
pool string
queueName string
nodeType string
phase string
}
type clusterMetricKey struct {
cluster string
pool string
nodeType string
}
func (c *MetricsCollector) updateClusterMetrics(ctx context.Context) ([]prometheus.Metric, error) {
executors, err := c.executorRepository.GetExecutors(ctx)
if err != nil {
return nil, err
}
phaseCountByQueue := map[queuePhaseMetricKey]int{}
allocatedResourceByQueue := map[queueMetricKey]schedulerobjects.ResourceList{}
usedResourceByQueue := map[queueMetricKey]schedulerobjects.ResourceList{}
availableResourceByCluster := map[clusterMetricKey]schedulerobjects.ResourceList{}
totalResourceByCluster := map[clusterMetricKey]schedulerobjects.ResourceList{}
txn := c.jobDb.ReadTxn()
for _, executor := range executors {
for _, node := range executor.Nodes {
clusterKey := clusterMetricKey{
cluster: executor.Id,
pool: executor.Pool,
nodeType: node.ReportingNodeType,
}
if !node.Unschedulable {
addToResourceListMap(availableResourceByCluster, clusterKey, node.AvailableArmadaResource())
}
addToResourceListMap(totalResourceByCluster, clusterKey, node.TotalResources)
for queueName, resourceUsage := range node.ResourceUsageByQueue {
queueKey := queueMetricKey{
cluster: executor.Id,
pool: executor.Pool,
queueName: queueName,
nodeType: node.ReportingNodeType,
}
addToResourceListMap(usedResourceByQueue, queueKey, *resourceUsage)
}
for runId, jobRunState := range node.StateByJobRunId {
job := c.jobDb.GetByRunId(txn, uuid.MustParse(runId))
if job != nil {
phase := schedulerobjects.JobRunState_name[int32(jobRunState)]
key := queuePhaseMetricKey{
cluster: executor.Id,
pool: executor.Pool,
queueName: job.Queue(),
nodeType: node.ReportingNodeType,
// Convert to string with first letter capitalised
phase: strings.Title(strings.ToLower(phase)),
}
phaseCountByQueue[key]++
podRequirements := job.PodRequirements()
if podRequirements != nil {
queueKey := queueMetricKey{
cluster: executor.Id,
pool: executor.Pool,
queueName: job.Queue(),
nodeType: node.ReportingNodeType,
}
addToResourceListMap(allocatedResourceByQueue, queueKey, schedulerobjects.ResourceListFromV1ResourceList(podRequirements.ResourceRequirements.Requests))
}
}
}
}
}
clusterMetrics := make([]prometheus.Metric, 0, len(phaseCountByQueue))
for k, v := range phaseCountByQueue {
clusterMetrics = append(clusterMetrics, commonmetrics.NewQueueLeasedPodCount(float64(v), k.cluster, k.pool, k.queueName, k.phase, k.nodeType))
}
for k, r := range allocatedResourceByQueue {
for resourceKey, resourceValue := range r.Resources {
clusterMetrics = append(clusterMetrics, commonmetrics.NewQueueAllocated(resource.QuantityAsFloat64(resourceValue), k.queueName, k.cluster, k.pool, resourceKey, k.nodeType))
}
}
for k, r := range usedResourceByQueue {
for resourceKey, resourceValue := range r.Resources {
clusterMetrics = append(clusterMetrics, commonmetrics.NewQueueUsed(resource.QuantityAsFloat64(resourceValue), k.queueName, k.cluster, k.pool, resourceKey, k.nodeType))
}
}
for k, r := range availableResourceByCluster {
for resourceKey, resourceValue := range r.Resources {
clusterMetrics = append(clusterMetrics, commonmetrics.NewClusterAvailableCapacity(resource.QuantityAsFloat64(resourceValue), k.cluster, k.pool, resourceKey, k.nodeType))
}
}
for k, r := range totalResourceByCluster {
for resourceKey, resourceValue := range r.Resources {
clusterMetrics = append(clusterMetrics, commonmetrics.NewClusterTotalCapacity(resource.QuantityAsFloat64(resourceValue), k.cluster, k.pool, resourceKey, k.nodeType))
}
}
return clusterMetrics, nil
}
func addToResourceListMap[K comparable](m map[K]schedulerobjects.ResourceList, key K, value schedulerobjects.ResourceList) {
if _, exists := m[key]; !exists {
m[key] = schedulerobjects.ResourceList{}
}
newValue := m[key]
newValue.Add(value)
m[key] = newValue
}