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Impose length limit when concatenating revision history

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This commit is contained in:
Ted Yu
2019-05-08 10:14:16 -07:00
committed by Ted Yu
parent 22b6c69983
commit 9546fd540e
3 changed files with 30 additions and 9 deletions
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19
pkg/controller/deployment/util/deployment_util.go
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@@ -227,7 +227,7 @@ func Revision(obj runtime.Object) (int64, error) {
// SetNewReplicaSetAnnotations sets new replica set's annotations appropriately by updating its revision and
// copying required deployment annotations to it; it returns true if replica set's annotation is changed.
func SetNewReplicaSetAnnotations(deployment *apps.Deployment, newRS *apps.ReplicaSet, newRevision string, exists bool) bool {
func SetNewReplicaSetAnnotations(deployment *apps.Deployment, newRS *apps.ReplicaSet, newRevision string, exists bool, revHistoryLimitInChars int) bool {
// First, copy deployment's annotations (except for apply and revision annotations)
annotationChanged := copyDeploymentAnnotationsToReplicaSet(deployment, newRS)
// Then, update replica set's revision annotation
@@ -261,14 +261,25 @@ func SetNewReplicaSetAnnotations(deployment *apps.Deployment, newRS *apps.Replic
// If a revision annotation already existed and this replica set was updated with a new revision
// then that means we are rolling back to this replica set. We need to preserve the old revisions
// for historical information.
if ok && annotationChanged {
if ok && oldRevisionInt < newRevisionInt {
revisionHistoryAnnotation := newRS.Annotations[RevisionHistoryAnnotation]
oldRevisions := strings.Split(revisionHistoryAnnotation, ",")
if len(oldRevisions[0]) == 0 {
newRS.Annotations[RevisionHistoryAnnotation] = oldRevision
} else {
oldRevisions = append(oldRevisions, oldRevision)
newRS.Annotations[RevisionHistoryAnnotation] = strings.Join(oldRevisions, ",")
totalLen := len(revisionHistoryAnnotation) + len(oldRevision) + 1
// index for the starting position in oldRevisions
start := 0
for totalLen > revHistoryLimitInChars && start < len(oldRevisions) {
totalLen = totalLen - len(oldRevisions[start]) - 1
start++
}
if totalLen <= revHistoryLimitInChars {
oldRevisions = append(oldRevisions[start:], oldRevision)
newRS.Annotations[RevisionHistoryAnnotation] = strings.Join(oldRevisions, ",")
} else {
klog.Warningf("Not appending revision due to length limit of %v reached", revHistoryLimitInChars)
}
}
}
// If the new replica set is about to be created, we need to add replica annotations to it.