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Honor the RevisionHistoryLimit in StatefulSetSpec

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The StatefulSet controller cleans up ControllerRevisions at the end of
the reconcile loop. If something goes wrong during reconcile, it bails
out without actually performing this step. This commit moves the cleanup
to a deferred function call to guarantee it will be executed.

Fixes issue: https://github.com/kubernetes/kubernetes/issues/85690
This commit is contained in:
Nan Yu
2019-12-09 16:54:28 -08:00
parent 1e12d92a51
commit 89bb7d8454
3 changed files with 75 additions and 15 deletions
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35
pkg/controller/statefulset/stateful_set_control.go
View File

@@ -20,12 +20,12 @@ import (
"math"
"sort"
"k8s.io/klog"
apps "k8s.io/api/apps/v1"
"k8s.io/api/core/v1"
v1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
utilerrors "k8s.io/apimachinery/pkg/util/errors"
"k8s.io/client-go/tools/record"
"k8s.io/klog"
"k8s.io/kubernetes/pkg/controller/history"
)
@@ -81,22 +81,34 @@ func (ssc *defaultStatefulSetControl) UpdateStatefulSet(set *apps.StatefulSet, p
}
history.SortControllerRevisions(revisions)
currentRevision, updateRevision, err := ssc.performUpdate(set, pods, revisions)
if err != nil {
return utilerrors.NewAggregate([]error{err, ssc.truncateHistory(set, pods, revisions, currentRevision, updateRevision)})
}
// maintain the set's revision history limit
return ssc.truncateHistory(set, pods, revisions, currentRevision, updateRevision)
}
func (ssc *defaultStatefulSetControl) performUpdate(
set *apps.StatefulSet, pods []*v1.Pod, revisions []*apps.ControllerRevision) (*apps.ControllerRevision, *apps.ControllerRevision, error) {
// get the current, and update revisions
currentRevision, updateRevision, collisionCount, err := ssc.getStatefulSetRevisions(set, revisions)
if err != nil {
return err
return currentRevision, updateRevision, err
}
// perform the main update function and get the status
status, err := ssc.updateStatefulSet(set, currentRevision, updateRevision, collisionCount, pods)
if err != nil {
return err
return currentRevision, updateRevision, err
}
// update the set's status
err = ssc.updateStatefulSetStatus(set, status)
if err != nil {
return err
return currentRevision, updateRevision, err
}
klog.V(4).Infof("StatefulSet %s/%s pod status replicas=%d ready=%d current=%d updated=%d",
@@ -113,8 +125,7 @@ func (ssc *defaultStatefulSetControl) UpdateStatefulSet(set *apps.StatefulSet, p
status.CurrentRevision,
status.UpdateRevision)
// maintain the set's revision history limit
return ssc.truncateHistory(set, pods, revisions, currentRevision, updateRevision)
return currentRevision, updateRevision, nil
}
func (ssc *defaultStatefulSetControl) ListRevisions(set *apps.StatefulSet) ([]*apps.ControllerRevision, error) {
@@ -151,7 +162,13 @@ func (ssc *defaultStatefulSetControl) truncateHistory(
update *apps.ControllerRevision) error {
history := make([]*apps.ControllerRevision, 0, len(revisions))
// mark all live revisions
live := map[string]bool{current.Name: true, update.Name: true}
live := map[string]bool{}
if current != nil {
live[current.Name] = true
}
if update != nil {
live[update.Name] = true
}
for i := range pods {
live[getPodRevision(pods[i])] = true
}