Add PVCRef to VolumeStats

For pod volumes that reference a PVC, add a PVCRef to the corresponding
volume stat. This allows metrics to be indexed/queried by PVC name
which is more user-friendly than Pod reference
This commit is contained in:
Vaibhav Kamra 2017-08-16 20:57:24 -07:00
parent 01e961b380
commit 1ac56d8cbb
5 changed files with 181 additions and 7 deletions

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@ -195,6 +195,15 @@ type VolumeStats struct {
// Name is the name given to the Volume
// +optional
Name string `json:"name,omitempty"`
// Reference to the PVC, if one exists
// +optional
PVCRef *PVCReference `json:"pvcRef,omitempty"`
}
// PVCReference contains enough information to describe the referenced PVC.
type PVCReference struct {
Name string `json:"name"`
Namespace string `json:"namespace"`
}
// FsStats contains data about filesystem usage.

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@ -29,15 +29,20 @@ go_library(
go_test(
name = "go_default_test",
srcs = ["summary_test.go"],
srcs = [
"summary_test.go",
"volume_stat_calculator_test.go",
],
library = ":go_default_library",
deps = [
"//pkg/kubelet/apis/stats/v1alpha1:go_default_library",
"//pkg/kubelet/cm:go_default_library",
"//pkg/kubelet/server/stats/testing:go_default_library",
"//pkg/volume:go_default_library",
"//vendor/github.com/google/gofuzz:go_default_library",
"//vendor/github.com/stretchr/testify/assert:go_default_library",
"//vendor/k8s.io/api/core/v1:go_default_library",
"//vendor/k8s.io/apimachinery/pkg/api/resource:go_default_library",
"//vendor/k8s.io/apimachinery/pkg/apis/meta/v1:go_default_library",
],
)

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@ -92,8 +92,14 @@ func (s *volumeStatCalculator) calcAndStoreStats() {
return
}
// Get volume specs for the pod - key'd by volume name
volumesSpec := make(map[string]v1.Volume)
for _, v := range s.pod.Spec.Volumes {
volumesSpec[v.Name] = v
}
// Call GetMetrics on each Volume and copy the result to a new VolumeStats.FsStats
stats := make([]stats.VolumeStats, 0, len(volumes))
fsStats := make([]stats.VolumeStats, 0, len(volumes))
for name, v := range volumes {
metric, err := v.GetMetrics()
if err != nil {
@ -103,15 +109,25 @@ func (s *volumeStatCalculator) calcAndStoreStats() {
}
continue
}
stats = append(stats, s.parsePodVolumeStats(name, metric))
// Lookup the volume spec and add a 'PVCReference' for volumes that reference a PVC
volSpec := volumesSpec[name]
if pvcSource := volSpec.PersistentVolumeClaim; pvcSource != nil {
pvcRef := stats.PVCReference{
Name: pvcSource.ClaimName,
Namespace: s.pod.GetNamespace(),
}
fsStats = append(fsStats, s.parsePodVolumeStats(name, &pvcRef, metric))
} else {
fsStats = append(fsStats, s.parsePodVolumeStats(name, nil, metric))
}
}
// Store the new stats
s.latest.Store(PodVolumeStats{Volumes: stats})
s.latest.Store(PodVolumeStats{Volumes: fsStats})
}
// parsePodVolumeStats converts (internal) volume.Metrics to (external) stats.VolumeStats structures
func (s *volumeStatCalculator) parsePodVolumeStats(podName string, metric *volume.Metrics) stats.VolumeStats {
func (s *volumeStatCalculator) parsePodVolumeStats(podName string, pvcRef *stats.PVCReference, metric *volume.Metrics) stats.VolumeStats {
available := uint64(metric.Available.Value())
capacity := uint64(metric.Capacity.Value())
used := uint64(metric.Used.Value())
@ -119,7 +135,8 @@ func (s *volumeStatCalculator) parsePodVolumeStats(podName string, metric *volum
inodesFree := uint64(metric.InodesFree.Value())
inodesUsed := uint64(metric.InodesUsed.Value())
return stats.VolumeStats{
Name: podName,
Name: podName,
PVCRef: pvcRef,
FsStats: stats.FsStats{Time: metric.Time, AvailableBytes: &available, CapacityBytes: &capacity,
UsedBytes: &used, Inodes: &inodes, InodesFree: &inodesFree, InodesUsed: &inodesUsed},
}

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@ -0,0 +1,142 @@
/*
Copyright 2017 The Kubernetes Authors.
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 stats
import (
"github.com/stretchr/testify/assert"
"testing"
"time"
k8sv1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/resource"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
kubestats "k8s.io/kubernetes/pkg/kubelet/apis/stats/v1alpha1"
statstest "k8s.io/kubernetes/pkg/kubelet/server/stats/testing"
"k8s.io/kubernetes/pkg/volume"
)
const (
namespace0 = "test0"
pName0 = "pod0"
capacity = int64(10000000)
available = int64(5000000)
inodesTotal = int64(2000)
inodesFree = int64(1000)
vol0 = "vol0"
vol1 = "vol1"
pvcClaimName = "pvc-fake"
)
func TestPVCRef(t *testing.T) {
// Create pod spec to test against
podVolumes := []k8sv1.Volume{
{
Name: vol0,
VolumeSource: k8sv1.VolumeSource{
GCEPersistentDisk: &k8sv1.GCEPersistentDiskVolumeSource{
PDName: "fake-device1",
},
},
},
{
Name: vol1,
VolumeSource: k8sv1.VolumeSource{
PersistentVolumeClaim: &k8sv1.PersistentVolumeClaimVolumeSource{
ClaimName: pvcClaimName,
},
},
},
}
fakePod := &k8sv1.Pod{
ObjectMeta: metav1.ObjectMeta{
Name: pName0,
Namespace: namespace0,
UID: "UID" + pName0,
},
Spec: k8sv1.PodSpec{
Volumes: podVolumes,
},
}
// Setup mock stats provider
mockStats := new(statstest.StatsProvider)
volumes := map[string]volume.Volume{vol0: &fakeVolume{}, vol1: &fakeVolume{}}
mockStats.On("ListVolumesForPod", fakePod.UID).Return(volumes, true)
// Calculate stats for pod
statsCalculator := newVolumeStatCalculator(mockStats, time.Minute, fakePod)
statsCalculator.calcAndStoreStats()
vs, _ := statsCalculator.GetLatest()
assert.Len(t, vs.Volumes, 2)
// Verify 'vol0' doesn't have a PVC reference
assert.Contains(t, vs.Volumes, kubestats.VolumeStats{
Name: vol0,
FsStats: expectedFSStats(),
})
// Verify 'vol1' has a PVC reference
assert.Contains(t, vs.Volumes, kubestats.VolumeStats{
Name: vol1,
PVCRef: &kubestats.PVCReference{
Name: pvcClaimName,
Namespace: namespace0,
},
FsStats: expectedFSStats(),
})
}
// Fake volume/metrics provider
var _ volume.Volume = &fakeVolume{}
type fakeVolume struct{}
func (v *fakeVolume) GetPath() string { return "" }
func (v *fakeVolume) GetMetrics() (*volume.Metrics, error) {
return expectedMetrics(), nil
}
func expectedMetrics() *volume.Metrics {
return &volume.Metrics{
Available: resource.NewQuantity(available, resource.BinarySI),
Capacity: resource.NewQuantity(capacity, resource.BinarySI),
Used: resource.NewQuantity(available-capacity, resource.BinarySI),
Inodes: resource.NewQuantity(inodesTotal, resource.BinarySI),
InodesFree: resource.NewQuantity(inodesFree, resource.BinarySI),
InodesUsed: resource.NewQuantity(inodesTotal-inodesFree, resource.BinarySI),
}
}
func expectedFSStats() kubestats.FsStats {
metric := expectedMetrics()
available := uint64(metric.Available.Value())
capacity := uint64(metric.Capacity.Value())
used := uint64(metric.Used.Value())
inodes := uint64(metric.Inodes.Value())
inodesFree := uint64(metric.InodesFree.Value())
inodesUsed := uint64(metric.InodesUsed.Value())
return kubestats.FsStats{
AvailableBytes: &available,
CapacityBytes: &capacity,
UsedBytes: &used,
Inodes: &inodes,
InodesFree: &inodesFree,
InodesUsed: &inodesUsed,
}
}

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@ -181,7 +181,8 @@ var _ = framework.KubeDescribe("Summary API", func() {
}),
"VolumeStats": gstruct.MatchAllElements(summaryObjectID, gstruct.Elements{
"test-empty-dir": gstruct.MatchAllFields(gstruct.Fields{
"Name": Equal("test-empty-dir"),
"Name": Equal("test-empty-dir"),
"PVCRef": BeNil(),
"FsStats": gstruct.MatchAllFields(gstruct.Fields{
"Time": recent(maxStatsAge),
"AvailableBytes": fsCapacityBounds,