kubernetes backoff_test 源码
kubernetes backoff_test 代码
文件路径:/staging/src/k8s.io/client-go/util/flowcontrol/backoff_test.go
/*
Copyright 2015 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 flowcontrol
import (
"testing"
"time"
testingclock "k8s.io/utils/clock/testing"
)
func TestSlowBackoff(t *testing.T) {
id := "_idSlow"
tc := testingclock.NewFakeClock(time.Now())
step := time.Second
maxDuration := 50 * step
b := NewFakeBackOff(step, maxDuration, tc)
cases := []time.Duration{0, 1, 2, 4, 8, 16, 32, 50, 50, 50}
for ix, c := range cases {
tc.Step(step)
w := b.Get(id)
if w != c*step {
t.Errorf("input: '%d': expected %s, got %s", ix, c*step, w)
}
b.Next(id, tc.Now())
}
//Now confirm that the Reset cancels backoff.
b.Next(id, tc.Now())
b.Reset(id)
if b.Get(id) != 0 {
t.Errorf("Reset didn't clear the backoff.")
}
}
func TestBackoffReset(t *testing.T) {
id := "_idReset"
tc := testingclock.NewFakeClock(time.Now())
step := time.Second
maxDuration := step * 5
b := NewFakeBackOff(step, maxDuration, tc)
startTime := tc.Now()
// get to backoff = maxDuration
for i := 0; i <= int(maxDuration/step); i++ {
tc.Step(step)
b.Next(id, tc.Now())
}
// backoff should be capped at maxDuration
if !b.IsInBackOffSince(id, tc.Now()) {
t.Errorf("expected to be in Backoff got %s", b.Get(id))
}
lastUpdate := tc.Now()
tc.Step(2*maxDuration + step) // time += 11s, 11 > 2*maxDuration
if b.IsInBackOffSince(id, lastUpdate) {
t.Errorf("expected to not be in Backoff after reset (start=%s, now=%s, lastUpdate=%s), got %s", startTime, tc.Now(), lastUpdate, b.Get(id))
}
}
func TestBackoffHighWaterMark(t *testing.T) {
id := "_idHiWaterMark"
tc := testingclock.NewFakeClock(time.Now())
step := time.Second
maxDuration := 5 * step
b := NewFakeBackOff(step, maxDuration, tc)
// get to backoff = maxDuration
for i := 0; i <= int(maxDuration/step); i++ {
tc.Step(step)
b.Next(id, tc.Now())
}
// backoff high watermark expires after 2*maxDuration
tc.Step(maxDuration + step)
b.Next(id, tc.Now())
if b.Get(id) != maxDuration {
t.Errorf("expected Backoff to stay at high watermark %s got %s", maxDuration, b.Get(id))
}
}
func TestBackoffGC(t *testing.T) {
id := "_idGC"
tc := testingclock.NewFakeClock(time.Now())
step := time.Second
maxDuration := 5 * step
b := NewFakeBackOff(step, maxDuration, tc)
for i := 0; i <= int(maxDuration/step); i++ {
tc.Step(step)
b.Next(id, tc.Now())
}
lastUpdate := tc.Now()
tc.Step(maxDuration + step)
b.GC()
_, found := b.perItemBackoff[id]
if !found {
t.Errorf("expected GC to skip entry, elapsed time=%s maxDuration=%s", tc.Since(lastUpdate), maxDuration)
}
tc.Step(maxDuration + step)
b.GC()
r, found := b.perItemBackoff[id]
if found {
t.Errorf("expected GC of entry after %s got entry %v", tc.Since(lastUpdate), r)
}
}
func TestIsInBackOffSinceUpdate(t *testing.T) {
id := "_idIsInBackOffSinceUpdate"
tc := testingclock.NewFakeClock(time.Now())
step := time.Second
maxDuration := 10 * step
b := NewFakeBackOff(step, maxDuration, tc)
startTime := tc.Now()
cases := []struct {
tick time.Duration
inBackOff bool
value int
}{
{tick: 0, inBackOff: false, value: 0},
{tick: 1, inBackOff: false, value: 1},
{tick: 2, inBackOff: true, value: 2},
{tick: 3, inBackOff: false, value: 2},
{tick: 4, inBackOff: true, value: 4},
{tick: 5, inBackOff: true, value: 4},
{tick: 6, inBackOff: true, value: 4},
{tick: 7, inBackOff: false, value: 4},
{tick: 8, inBackOff: true, value: 8},
{tick: 9, inBackOff: true, value: 8},
{tick: 10, inBackOff: true, value: 8},
{tick: 11, inBackOff: true, value: 8},
{tick: 12, inBackOff: true, value: 8},
{tick: 13, inBackOff: true, value: 8},
{tick: 14, inBackOff: true, value: 8},
{tick: 15, inBackOff: false, value: 8},
{tick: 16, inBackOff: true, value: 10},
{tick: 17, inBackOff: true, value: 10},
{tick: 18, inBackOff: true, value: 10},
{tick: 19, inBackOff: true, value: 10},
{tick: 20, inBackOff: true, value: 10},
{tick: 21, inBackOff: true, value: 10},
{tick: 22, inBackOff: true, value: 10},
{tick: 23, inBackOff: true, value: 10},
{tick: 24, inBackOff: true, value: 10},
{tick: 25, inBackOff: false, value: 10},
{tick: 26, inBackOff: true, value: 10},
{tick: 27, inBackOff: true, value: 10},
{tick: 28, inBackOff: true, value: 10},
{tick: 29, inBackOff: true, value: 10},
{tick: 30, inBackOff: true, value: 10},
{tick: 31, inBackOff: true, value: 10},
{tick: 32, inBackOff: true, value: 10},
{tick: 33, inBackOff: true, value: 10},
{tick: 34, inBackOff: true, value: 10},
{tick: 35, inBackOff: false, value: 10},
{tick: 56, inBackOff: false, value: 0},
{tick: 57, inBackOff: false, value: 1},
}
for _, c := range cases {
tc.SetTime(startTime.Add(c.tick * step))
if c.inBackOff != b.IsInBackOffSinceUpdate(id, tc.Now()) {
t.Errorf("expected IsInBackOffSinceUpdate %v got %v at tick %s", c.inBackOff, b.IsInBackOffSinceUpdate(id, tc.Now()), c.tick*step)
}
if c.inBackOff && (time.Duration(c.value)*step != b.Get(id)) {
t.Errorf("expected backoff value=%s got %s at tick %s", time.Duration(c.value)*step, b.Get(id), c.tick*step)
}
if !c.inBackOff {
b.Next(id, tc.Now())
}
}
}
func TestBackoffWithJitter(t *testing.T) {
id := "_idJitter"
tc := testingclock.NewFakeClock(time.Now())
// test setup: we show 11 iterations, series of delays we expect with
// a jitter factor of zero each time:
// 100ms 200ms 400ms 800ms 1.6s 3.2s 06.4s 12.8s 25.6s 51.2s 1m42s
// and with jitter factor of 0.1 (max) each time:
// 110ms 231ms 485ms 1.0s 2.1s 4.4s 09.4s 19.8s 41.6s 1m27s 2m6s
//
// with the following configuration, it is guaranteed that the maximum delay
// will be reached even though we are unlucky and get jitter factor of zero.
// This ensures that this test covers the code path for checking whether
// maximum delay has been reached with jitter enabled.
initial := 100 * time.Millisecond
maxDuration := time.Minute
maxJitterFactor := 0.1
attempts := 10
b := NewFakeBackOffWithJitter(initial, maxDuration, tc, maxJitterFactor)
assert := func(t *testing.T, factor int, prevDelayGot, curDelayGot time.Duration) {
low := time.Duration((float64(prevDelayGot) * float64(factor)))
high := low + time.Duration(maxJitterFactor*float64(prevDelayGot))
if !((curDelayGot > low && curDelayGot <= high) || curDelayGot == maxDuration) {
t.Errorf("jittered delay not within range: (%s - %s], but got %s", low, high, curDelayGot)
}
}
delays := make([]time.Duration, 0)
next := func() time.Duration {
tc.Step(initial)
b.Next(id, tc.Now())
delay := b.Get(id)
delays = append(delays, delay)
return delay
}
if got := b.Get(id); got != 0 {
t.Errorf("expected a zero wait durtion, but got: %s", got)
}
delayGot := next()
assert(t, 1, initial, delayGot)
prevDelayGot := delayGot
for i := 0; i < attempts; i++ {
delayGot = next()
assert(t, 2, prevDelayGot, delayGot)
prevDelayGot = delayGot
}
t.Logf("exponentially backed off jittered delays: %v", delays)
}
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