controller-runtime Should we support `MutationCache` in controller-runtime?

Description

This is NOT intended to make the real cache mutable. Actually, MutationCache is a struct defined in client-go. But it needs args like Store and Indexer in client-go, so it is hard to be used with controller-runtime.

So I would like to add a similar one in controller-runtime to work with sigs.k8s.io/controller-runtime/pkg/cache.

Why is this needed

For example, when a controller reconciles an object, it will do some tasks and update the object to identity the things have been done. However, when an object has been triggered multiple times and controller reconciles the object continuously, it might do the tasks repeatedly because the object updated in previous reconcile has not synced into local cache.

In such scenario, MutationCache could help the controller avoid most unnecessary tasks, if it saves the updated object into MutationCache (NOT the real cache) and can be reused in next reconcile.

Dec 27 '21 07:12 FillZpp

/assign

Dec 27 '21 07:12 FillZpp

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/lifecycle stale

Mar 27 '22 07:03 k8s-triage-robot

/remove-lifecycle stale

Mar 28 '22 06:03 FillZpp

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

This bot triages issues and PRs according to the following rules:

After 90d of inactivity, lifecycle/stale is applied
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/lifecycle stale

Jun 26 '22 06:06 k8s-triage-robot

/remove-lifecycle stale

Jun 26 '22 08:06 FillZpp

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

This bot triages issues and PRs according to the following rules:

After 90d of inactivity, lifecycle/stale is applied
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You can:

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/lifecycle stale

Sep 24 '22 09:09 k8s-triage-robot

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

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/lifecycle rotten

Oct 24 '22 09:10 k8s-triage-robot

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

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

Nov 23 '22 09:11 k8s-triage-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

After 30d of inactivity since lifecycle/rotten was applied, the issue is closed

You can:

Reopen this issue with /reopen

Mark this issue as fresh with /remove-lifecycle rotten

Offer to help out with Issue Triage

Please send feedback to sig-contributor-experience at kubernetes/community.

/close not-planned

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Nov 23 '22 09:11 k8s-ci-robot