StatefulSets - improvement on RollingUpdates section

[antaloala]

trafficstars

I think it would be really useful to comment, at the end of the StatefulSet - Rolling Updates section that if a pod not-yet-upgraded crashes as the rolling update procedure is running, the statefulset controller:

• pauses the ongoing rolling update procedure (once the being upgraded pod (at the time of that crash) gets the Ready state)
• re-creates the crashed pod using the "old" PodTemplate (i.e. PodTemplate defined in the StatefulSet object before the patch operation that triggered the ongoing rolling upgrade was committed in API Server)
• once the re-created pod becomes Ready, resumes the rolling update procedure.

Only exceptions for this behavior:

• the crashed pod is just the following one in the 'upgrade order list' (in this case it is recreated as part of the ongoing rolling update procedure, using the latest PodTemplate)
• and/or number of not-yet-updraded crashed pods (from the time the rolling upgrade started) has not reached the .spec.updateStrategy.rollingUpdate.maxUnavailable value yet (only in case Statefulset MaximumUnavailablePods feature is enabled)

[sftim]

/kind feature /language en

[RA489]

/triage accepted

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/lifecycle stale

[tengqm]

/remove-lifecycle stale

[sftim]

/retitle StatefulSets - improvement on RollingUpdates section

[justankiit]

Hey @antaloala are we talking about comments or Notes at the bottom of Rolling Updates!!

[k8s-triage-robot]

This issue has not been updated in over 1 year, and should be re-triaged.

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/remove-triage accepted

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/lifecycle stale

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/lifecycle rotten

[k8s-triage-robot]

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

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/close not-planned

[k8s-ci-robot]

@k8s-triage-robot: Closing this issue, marking it as "Not Planned".

In response to this:

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

This bot triages issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
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/close not-planned

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