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Merge pull request #71731 from cheftako/leaseMetric

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Add gauge metric for master of leader election.

Kubernetes-commit: cc67ccfd7f4f0bc96d7f1c8e5fe8577821757d03
This commit is contained in:
Kubernetes Publisher 2019-01-08 08:57:53 -08:00
commit ca71eb39ed
5 changed files with 120 additions and 637 deletions
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626
Godeps/Godeps.json generated
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{
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},
{
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]
}

2
Godeps/OWNERS generated
View File

@ -1,2 +0,0 @@
approvers:
- dep-approvers

5
Godeps/Readme generated
View File

@ -1,5 +0,0 @@
This directory tree is generated automatically by godep.
Please do not edit.
See https://github.com/tools/godep for more information.

15
tools/leaderelection/leaderelection.go
View File

@ -89,10 +89,13 @@ func NewLeaderElector(lec LeaderElectionConfig) (*LeaderElector, error) {
if lec.Lock == nil {
return nil, fmt.Errorf("Lock must not be nil.")
}
return &LeaderElector{
config: lec,
clock: clock.RealClock{},
}, nil
le := LeaderElector{
config: lec,
clock: clock.RealClock{},
metrics: globalMetricsFactory.newLeaderMetrics(),
}
le.metrics.leaderOff(le.config.Name)
return &le, nil
}
type LeaderElectionConfig struct {
@ -152,6 +155,8 @@ type LeaderElector struct {
// clock is wrapper around time to allow for less flaky testing
clock clock.Clock
metrics leaderMetricsAdapter
// name is the name of the resource lock for debugging
name string
}
@ -211,6 +216,7 @@ func (le *LeaderElector) acquire(ctx context.Context) bool {
return
}
le.config.Lock.RecordEvent("became leader")
le.metrics.leaderOn(le.config.Name)
klog.Infof("successfully acquired lease %v", desc)
cancel()
}, le.config.RetryPeriod, JitterFactor, true, ctx.Done())
@ -246,6 +252,7 @@ func (le *LeaderElector) renew(ctx context.Context) {
return
}
le.config.Lock.RecordEvent("stopped leading")
le.metrics.leaderOff(le.config.Name)
klog.Infof("failed to renew lease %v: %v", desc, err)
cancel()
}, le.config.RetryPeriod, ctx.Done())

109
tools/leaderelection/metrics.go Normal file
View File

@ -0,0 +1,109 @@
/*
Copyright 2018 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 leaderelection
import (
"sync"
)
// This file provides abstractions for setting the provider (e.g., prometheus)
// of metrics.
type leaderMetricsAdapter interface {
leaderOn(name string)
leaderOff(name string)
}
// GaugeMetric represents a single numerical value that can arbitrarily go up
// and down.
type SwitchMetric interface {
On(name string)
Off(name string)
}
type noopMetric struct{}
func (noopMetric) On(name string) {}
func (noopMetric) Off(name string) {}
// defaultLeaderMetrics expects the caller to lock before setting any metrics.
type defaultLeaderMetrics struct {
// leader's value indicates if the current process is the owner of name lease
leader SwitchMetric
}
func (m *defaultLeaderMetrics) leaderOn(name string) {
if m == nil {
return
}
m.leader.On(name)
}
func (m *defaultLeaderMetrics) leaderOff(name string) {
if m == nil {
return
}
m.leader.Off(name)
}
type noMetrics struct{}
func (noMetrics) leaderOn(name string) {}
func (noMetrics) leaderOff(name string) {}
// MetricsProvider generates various metrics used by the leader election.
type MetricsProvider interface {
NewLeaderMetric() SwitchMetric
}
type noopMetricsProvider struct{}
func (_ noopMetricsProvider) NewLeaderMetric() SwitchMetric {
return noopMetric{}
}
var globalMetricsFactory = leaderMetricsFactory{
metricsProvider: noopMetricsProvider{},
}
type leaderMetricsFactory struct {
metricsProvider MetricsProvider
onlyOnce sync.Once
}
func (f *leaderMetricsFactory) setProvider(mp MetricsProvider) {
f.onlyOnce.Do(func() {
f.metricsProvider = mp
})
}
func (f *leaderMetricsFactory) newLeaderMetrics() leaderMetricsAdapter {
mp := f.metricsProvider
if mp == (noopMetricsProvider{}) {
return noMetrics{}
}
return &defaultLeaderMetrics{
leader: mp.NewLeaderMetric(),
}
}
// SetProvider sets the metrics provider for all subsequently created work
// queues. Only the first call has an effect.
func SetProvider(metricsProvider MetricsProvider) {
globalMetricsFactory.setProvider(metricsProvider)
}