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Fix runners to not terminate before unregistration when scaling down 

#1179 was not working particularly for scale down of static (and perhaps long-running ephemeral) runners, which resulted in some runner pods are terminated before the requested unregistration processes complete, that triggered some in-progress workflow jobs to hang forever. This fixes an edge-case that resulted in a decreased desired replicas to trigger the failure, so that every runner is unregistered then terminated, as originally designed.
This commit is contained in:
Yusuke Kuoka 2022-03-13 13:09:46 +00:00
parent 7123b18a47
commit 4551309e30
1 changed files with 15 additions and 13 deletions
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28
controllers/runner_pod_owner.go
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@ -429,24 +429,26 @@ func syncRunnerPodsOwners(ctx context.Context, c client.Client, log logr.Logger,
// or actions/runner may potentially misbehave on SIGTERM immediately sent by K8s.
// We'd better unregister first and then start a pod deletion process.
// The annotation works as a mark to start the pod unregistration and deletion process of ours.
if _, ok := getAnnotation(ss.owner, AnnotationKeyUnregistrationRequestTimestamp); ok {
log.V(2).Info("Still waiting for runner pod(s) unregistration to complete")
continue
}
for _, po := range ss.pods {
if _, err := annotatePodOnce(ctx, c, log, &po, AnnotationKeyUnregistrationRequestTimestamp, time.Now().Format(time.RFC3339)); err != nil {
return nil, err
}
}
if _, ok := getAnnotation(ss.owner, AnnotationKeyUnregistrationRequestTimestamp); !ok {
updated := ss.owner.withAnnotation(AnnotationKeyUnregistrationRequestTimestamp, time.Now().Format(time.RFC3339))
if err := c.Patch(ctx, updated, client.MergeFrom(ss.owner)); err != nil {
log.Error(err, fmt.Sprintf("Failed to patch owner to have %s annotation", AnnotationKeyUnregistrationRequestTimestamp))
return nil, err
}
log.V(2).Info("Redundant owner has been annotated to start the unregistration before deletion")
} else {
log.V(2).Info("BUG: Redundant object was already annotated")
updated := ss.owner.withAnnotation(AnnotationKeyUnregistrationRequestTimestamp, time.Now().Format(time.RFC3339))
if err := c.Patch(ctx, updated, client.MergeFrom(ss.owner)); err != nil {
log.Error(err, fmt.Sprintf("Failed to patch owner to have %s annotation", AnnotationKeyUnregistrationRequestTimestamp))
return nil, err
}
log.V(2).Info("Redundant owner has been annotated to start the unregistration before deletion")
}
} else if retained > newDesiredReplicas {
log.V(2).Info("Waiting sync before scale down", "retained", retained, "newDesiredReplicas", newDesiredReplicas)
@ -555,9 +557,9 @@ func collectPodsForOwners(ctx context.Context, c client.Client, log logr.Logger,
} else {
log.V(2).Info("BUG: Redundant owner was already annotated to start the deletion")
}
}
continue
continue
}
}
if annotations := res.owner.GetAnnotations(); annotations != nil {