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metrics_client.go
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/
metrics_client.go
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/*
Copyright 2015 The Kubernetes Authors All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package metrics
import (
"encoding/json"
"fmt"
"strings"
"time"
"github.com/golang/glog"
"k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/api/resource"
client "k8s.io/kubernetes/pkg/client/unversioned"
"k8s.io/kubernetes/pkg/fields"
"k8s.io/kubernetes/pkg/labels"
heapster "k8s.io/heapster/api/v1/types"
)
const (
DefaultHeapsterNamespace = "kube-system"
DefaultHeapsterScheme = "http"
DefaultHeapsterService = "heapster"
DefaultHeapsterPort = "" // use the first exposed port on the service
)
var heapsterQueryStart = -5 * time.Minute
// MetricsClient is an interface for getting metrics for pods.
type MetricsClient interface {
// GetCPUUtilization returns average utilization over all pods
// represented as a percent of requested CPU, e.g. 70 means that
// an average pod uses 70% of the requested CPU.
GetCPUUtilization(namespace string, selector map[string]string) (*int, error)
}
// ResourceConsumption specifies consumption of a particular resource.
type ResourceConsumption struct {
Resource api.ResourceName
Quantity resource.Quantity
}
// Aggregates results into ResourceConsumption. Also returns number of
// pods included in the aggregation.
type metricAggregator func(heapster.MetricResultList) (ResourceConsumption, int)
type metricDefinition struct {
name string
aggregator metricAggregator
}
// HeapsterMetricsClient is Heapster-based implementation of MetricsClient
type HeapsterMetricsClient struct {
client client.Interface
resourceDefinitions map[api.ResourceName]metricDefinition
heapsterNamespace string
heapsterScheme string
heapsterService string
heapsterPort string
}
var heapsterMetricDefinitions = map[api.ResourceName]metricDefinition{
api.ResourceCPU: {"cpu-usage",
func(metrics heapster.MetricResultList) (ResourceConsumption, int) {
sum, count := calculateSumFromLatestSample(metrics)
value := "0"
if count > 0 {
// assumes that cpu usage is in millis
value = fmt.Sprintf("%dm", sum/uint64(count))
}
return ResourceConsumption{Resource: api.ResourceCPU, Quantity: resource.MustParse(value)}, count
}},
api.ResourceMemory: {"memory-usage",
func(metrics heapster.MetricResultList) (ResourceConsumption, int) {
sum, count := calculateSumFromLatestSample(metrics)
value := int64(0)
if count > 0 {
value = int64(sum) / int64(count)
}
return ResourceConsumption{Resource: api.ResourceMemory, Quantity: *resource.NewQuantity(value, resource.DecimalSI)}, count
}},
}
// NewHeapsterMetricsClient returns a new instance of Heapster-based implementation of MetricsClient interface.
func NewHeapsterMetricsClient(client client.Interface, namespace, scheme, service, port string) *HeapsterMetricsClient {
return &HeapsterMetricsClient{
client: client,
resourceDefinitions: heapsterMetricDefinitions,
heapsterNamespace: namespace,
heapsterScheme: scheme,
heapsterService: service,
heapsterPort: port,
}
}
func (h *HeapsterMetricsClient) GetCPUUtilization(namespace string, selector map[string]string) (*int, error) {
consumption, request, err := h.GetResourceConsumptionAndRequest(api.ResourceCPU, namespace, selector)
if err != nil {
return nil, fmt.Errorf("failed to get CPU consumption and request: %v", err)
}
utilization := new(int)
*utilization = int(float64(consumption.Quantity.MilliValue()) / float64(request.MilliValue()) * 100)
return utilization, nil
}
func (h *HeapsterMetricsClient) GetResourceConsumptionAndRequest(resourceName api.ResourceName, namespace string, selector map[string]string) (consumption *ResourceConsumption, request *resource.Quantity, err error) {
podList, err := h.client.Pods(namespace).
List(labels.SelectorFromSet(labels.Set(selector)), fields.Everything())
if err != nil {
return nil, nil, fmt.Errorf("failed to get pod list: %v", err)
}
podNames := []string{}
sum := resource.MustParse("0")
missing := false
for _, pod := range podList.Items {
podNames = append(podNames, pod.Name)
for _, container := range pod.Spec.Containers {
containerRequest := container.Resources.Requests[resourceName]
if containerRequest.Amount != nil {
sum.Add(containerRequest)
} else {
missing = true
}
}
}
if missing || sum.Cmp(resource.MustParse("0")) == 0 {
return nil, nil, fmt.Errorf("some pods do not have request for %s", resourceName)
}
glog.Infof("Sum of %s requested: %v", resourceName, sum)
avg := resource.MustParse(fmt.Sprintf("%dm", sum.MilliValue()/int64(len(podList.Items))))
request = &avg
consumption, err = h.getForPods(resourceName, namespace, podNames)
if err != nil {
return nil, nil, err
}
return consumption, request, nil
}
func (h *HeapsterMetricsClient) getForPods(resourceName api.ResourceName, namespace string, podNames []string) (*ResourceConsumption, error) {
metricSpec, metricDefined := h.resourceDefinitions[resourceName]
if !metricDefined {
return nil, fmt.Errorf("heapster metric not defined for %v", resourceName)
}
now := time.Now()
startTime := now.Add(heapsterQueryStart)
metricPath := fmt.Sprintf("/api/v1/model/namespaces/%s/pod-list/%s/metrics/%s",
namespace,
strings.Join(podNames, ","),
metricSpec.name)
resultRaw, err := h.client.Services(h.heapsterNamespace).
ProxyGet(h.heapsterScheme, h.heapsterService, h.heapsterPort, metricPath, map[string]string{"start": startTime.Format(time.RFC3339)}).
DoRaw()
if err != nil {
return nil, fmt.Errorf("failed to get pods metrics: %v", err)
}
var metrics heapster.MetricResultList
err = json.Unmarshal(resultRaw, &metrics)
if err != nil {
return nil, fmt.Errorf("failed to unmarshall heapster response: %v", err)
}
glog.Infof("Metrics available: %s", string(resultRaw))
currentConsumption, count := metricSpec.aggregator(metrics)
if count != len(podNames) {
return nil, fmt.Errorf("metrics obtained for %d/%d of pods", count, len(podNames))
}
return ¤tConsumption, nil
}
func calculateSumFromLatestSample(metrics heapster.MetricResultList) (uint64, int) {
sum := uint64(0)
count := 0
for _, metrics := range metrics.Items {
var newest *heapster.MetricPoint
newest = nil
for i, metricPoint := range metrics.Metrics {
if newest == nil || newest.Timestamp.Before(metricPoint.Timestamp) {
newest = &metrics.Metrics[i]
}
}
if newest != nil {
sum += newest.Value
count++
}
}
return sum, count
}