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Merge pull request #60536 from immutableT/transformer_metrics 

Automatic merge from submit-queue (batch tested with PRs 62748, 60536, 62300, 62661, 62731). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Instrument transformer.go with latency metrics.

**What this PR does / why we need it**:
Instrument transformer.go with latency metrics - allowing to measure performance impact of adding KMS Providers.
**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #

**Special notes for your reviewer**:

**Release note**:

```release-note
"NONE"
```

Kubernetes-commit: 42f6687a1cb258e07429213e4ffd56f81b8cd237
This commit is contained in:
Kubernetes Publisher 2018-04-17 19:53:15 -07:00
parent 9c5883a86b dfdceff3c6
commit 3d55a9b806
3 changed files with 212 additions and 148 deletions
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Godeps/Godeps.json generated
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@ -1148,595 +1148,595 @@
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{
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{
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{
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{
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{
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},
{
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"Rev": "c75e967654de13a2ec104f384a7eaa9cd910cac4"
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{
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{
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},
{
"ImportPath": "k8s.io/client-go/listers/certificates/v1beta1",
"Rev": "11179e1670c367e523060709f0b35a878fa9de9a"
"Rev": "c75e967654de13a2ec104f384a7eaa9cd910cac4"
},
{
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"Rev": "11179e1670c367e523060709f0b35a878fa9de9a"
"Rev": "c75e967654de13a2ec104f384a7eaa9cd910cac4"
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{
"ImportPath": "k8s.io/client-go/listers/events/v1beta1",
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{
"ImportPath": "k8s.io/client-go/listers/extensions/v1beta1",
"Rev": "11179e1670c367e523060709f0b35a878fa9de9a"
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},
{
"ImportPath": "k8s.io/client-go/listers/networking/v1",
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{
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{
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{
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{
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{
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{
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{
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{
"ImportPath": "k8s.io/kube-openapi/pkg/builder",

57
pkg/storage/value/metrics.go Normal file
View File

@ -0,0 +1,57 @@
/*
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 value
import (
"sync"
"time"
"github.com/prometheus/client_golang/prometheus"
)
var (
transformerLatencies = prometheus.NewHistogramVec(
prometheus.HistogramOpts{
Namespace: "apiserver",
Subsystem: "storage",
Name: "transformation_latencies_microseconds",
Help: "Latencies in microseconds of value transformation operations.",
// In-process transformations (ex. AES CBC) complete on the order of 20 microseconds. However, when
// external KMS is involved latencies may climb into milliseconds.
Buckets: prometheus.ExponentialBuckets(5, 2, 14),
},
[]string{"transformation_type"},
)
)
var registerMetrics sync.Once
func RegisterMetrics() {
registerMetrics.Do(func() {
prometheus.MustRegister(transformerLatencies)
})
}
func RecordTransformation(transformationType string, start time.Time) {
since := sinceInMicroseconds(start)
transformerLatencies.WithLabelValues(transformationType).Observe(float64(since))
}
func sinceInMicroseconds(start time.Time) int64 {
elapsedNanoseconds := time.Since(start).Nanoseconds()
return elapsedNanoseconds / int64(time.Microsecond)
}

7
pkg/storage/value/transformer.go
View File

@ -21,8 +21,13 @@ import (
"bytes"
"fmt"
"sync"
"time"
)
func init() {
RegisterMetrics()
}
// Context is additional information that a storage transformation may need to verify the data at rest.
type Context interface {
// AuthenticatedData should return an array of bytes that describes the current value. If the value changes,
@ -80,12 +85,14 @@ func (t *MutableTransformer) Set(transformer Transformer) {
}
func (t *MutableTransformer) TransformFromStorage(data []byte, context Context) (out []byte, stale bool, err error) {
defer RecordTransformation("from_storage", time.Now())
t.lock.RLock()
transformer := t.transformer
t.lock.RUnlock()
return transformer.TransformFromStorage(data, context)
}
func (t *MutableTransformer) TransformToStorage(data []byte, context Context) (out []byte, err error) {
defer RecordTransformation("to_storage", time.Now())
t.lock.RLock()
transformer := t.transformer
t.lock.RUnlock()