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KEP: MultiKueue external custom Job support.
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keps/2349-multikueue-external-custom-job-support/README.md
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# KEP-2349: MultiKueue external custom Job support | ||
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<!-- | ||
This is the title of your KEP. Keep it short, simple, and descriptive. A good | ||
title can help communicate what the KEP is and should be considered as part of | ||
any review. | ||
--> | ||
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<!-- | ||
A table of contents is helpful for quickly jumping to sections of a KEP and for | ||
highlighting any additional information provided beyond the standard KEP | ||
template. | ||
Ensure the TOC is wrapped with | ||
<code><!-- toc --&rt;<!-- /toc --&rt;</code> | ||
tags, and then generate with `hack/update-toc.sh`. | ||
--> | ||
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<!-- toc --> | ||
- [Summary](#summary) | ||
- [Motivation](#motivation) | ||
- [Goals](#goals) | ||
- [Non-Goals](#non-goals) | ||
- [Proposal](#proposal) | ||
- [User Stories (Optional)](#user-stories-optional) | ||
- [Story 1](#story-1) | ||
- [Notes/Constraints/Caveats (Optional)](#notesconstraintscaveats-optional) | ||
- [Risks and Mitigations](#risks-and-mitigations) | ||
- [Design Details](#design-details) | ||
- [Test Plan](#test-plan) | ||
- [Prerequisite testing updates](#prerequisite-testing-updates) | ||
- [Unit Tests](#unit-tests) | ||
- [Integration tests](#integration-tests) | ||
- [Graduation Criteria](#graduation-criteria) | ||
- [Implementation History](#implementation-history) | ||
- [Drawbacks](#drawbacks) | ||
- [Alternatives](#alternatives) | ||
<!-- /toc --> | ||
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## Summary | ||
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This KEP introduces the ability to create Multikueue Admission Check controllers with custom set of adapters. | ||
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<!-- | ||
This section is incredibly important for producing high-quality, user-focused | ||
documentation such as release notes or a development roadmap. It should be | ||
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avoid requiring implementors to split their attention between writing release | ||
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A good summary is probably at least a paragraph in length. | ||
Both in this section and below, follow the guidelines of the [documentation | ||
style guide]. In particular, wrap lines to a reasonable length, to make it | ||
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updates. | ||
[documentation style guide]: https://github.com/kubernetes/community/blob/master/contributors/guide/style-guide.md | ||
--> | ||
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## Motivation | ||
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Many Kueue adaptors have company specific CustomResources. | ||
Kueue should give a possibility to manage such CustomResources across multiple clusters. | ||
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<!-- | ||
This section is for explicitly listing the motivation, goals, and non-goals of | ||
this KEP. Describe why the change is important and the benefits to users. The | ||
motivation section can optionally provide links to [experience reports] to | ||
demonstrate the interest in a KEP within the wider Kubernetes community. | ||
[experience reports]: https://github.com/golang/go/wiki/ExperienceReports | ||
--> | ||
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### Goals | ||
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Allow specifying a controller and adapter for an external custom Job processed by Kueue. | ||
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<!-- | ||
List the specific goals of the KEP. What is it trying to achieve? How will we | ||
know that this has succeeded? | ||
--> | ||
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### Non-Goals | ||
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<!-- | ||
What is out of scope for this KEP? Listing non-goals helps to focus discussion | ||
and make progress. | ||
--> | ||
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## Proposal | ||
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<!-- | ||
This is where we get down to the specifics of what the proposal actually is. | ||
This should have enough detail that reviewers can understand exactly what | ||
you're proposing, but should not include things like API designs or | ||
implementation. What is the desired outcome and how do we measure success?. | ||
The "Design Details" section below is for the real | ||
nitty-gritty. | ||
--> | ||
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Make Multikueue admission check controller to run simultaneously with another set of Multkiueue adapters in one cluster. | ||
Provide a custom admission check controller name and adapters for Multikueue. | ||
Specified controller is used by workload, cluster and admission check reconcilers. | ||
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### User Stories (Optional) | ||
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<!-- | ||
Detail the things that people will be able to do if this KEP is implemented. | ||
Include as much detail as possible so that people can understand the "how" of | ||
the system. The goal here is to make this feel real for users without getting | ||
bogged down. | ||
--> | ||
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#### Story 1 | ||
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I would like to support the extension mechanism so that we can implement the MultiKueue controller for the custom / in-house Jobs. | ||
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### Notes/Constraints/Caveats (Optional) | ||
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<!-- | ||
What are the caveats to the proposal? | ||
What are some important details that didn't come across above? | ||
Go in to as much detail as necessary here. | ||
This might be a good place to talk about core concepts and how they relate. | ||
--> | ||
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### Risks and Mitigations | ||
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<!-- | ||
What are the risks of this proposal, and how do we mitigate? Think broadly. | ||
For example, consider both security and how this will impact the larger | ||
Kubernetes ecosystem. | ||
How will security be reviewed, and by whom? | ||
How will UX be reviewed, and by whom? | ||
Consider including folks who also work outside the SIG or subproject. | ||
--> | ||
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## Design Details | ||
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Provide a way to integrate external controllers to manage Jobs in the Kueue. | ||
MulikueueCluster API needs to be modified to ensure that one multikueue cluster is only managed by one admission check controller. | ||
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1. Add ControllerName to the `MultiKueueClusterSpec` | ||
```golang | ||
type MultiKueueClusterSpec struct { | ||
... | ||
// controllerName is name of the controller which will actually perform | ||
// the checks. This is the name with which controller identifies with, | ||
// not necessarily a K8S Pod or Deployment name. Cannot be empty. | ||
// +kubebuilder:validation:Required | ||
// +kubebuilder:default="kueue.x-k8s.io/multikueue" | ||
// +kubebuilder:validation:XValidation:rule="self == oldSelf", message="field is immutable" | ||
ControllerName string `json:"controllerName"` | ||
... | ||
``` | ||
2. Make Controller Name used in Multikueue admission check configurable. | ||
Extend MultiKueue Admission Check controller options to include controllerName. | ||
```golang | ||
type SetupOptions struct { | ||
... | ||
controllerName string | ||
... | ||
} | ||
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// WithControllerName - sets the controller name for which the multikueue | ||
// admission check match. | ||
func WithControllerName(controllerName string) SetupOption { | ||
return func(o *SetupOptions) { | ||
o.controllerName = controllerName | ||
} | ||
} | ||
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func SetupControllers(mgr ctrl.Manager, namespace string, opts ...SetupOption) error { | ||
... | ||
} | ||
``` | ||
3. Make the Adapters list for the MultiKueue Admission Check controller configurable. | ||
```golang | ||
type SetupOptions struct { | ||
... | ||
adapters map[string]jobframework.MultiKueueAdapter | ||
... | ||
} | ||
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// WithAdapters - sets all the MultiKueue adapters. | ||
func WithAdapters(adapters map[string]jobframework.MultiKueueAdapter) SetupOption { | ||
return func(o *SetupOptions) { | ||
o.adapters = adapters | ||
} | ||
} | ||
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// WithAdapter - sets or updates the adapter of the MultiKueue adapters. | ||
func WithAdapter(adapter jobframework.MultiKueueAdapter) SetupOption { | ||
return func(o *SetupOptions) { | ||
o.adapters[adapter.GVK().String()] = adapter | ||
} | ||
} | ||
``` | ||
<!-- | ||
This section should contain enough information that the specifics of your | ||
change are understandable. This may include API specs (though not always | ||
required) or even code snippets. If there's any ambiguity about HOW your | ||
proposal will be implemented, this is the place to discuss them. | ||
--> | ||
### Test Plan | ||
<!-- | ||
**Note:** *Not required until targeted at a release.* | ||
The goal is to ensure that we don't accept enhancements with inadequate testing. | ||
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expectations). Please adhere to the [Kubernetes testing guidelines][testing-guidelines] | ||
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[testing-guidelines]: https://git.k8s.io/community/contributors/devel/sig-testing/testing.md | ||
--> | ||
[x] I/we understand the owners of the involved components may require updates to | ||
existing tests to make this code solid enough prior to committing the changes necessary | ||
to implement this enhancement. | ||
##### Prerequisite testing updates | ||
<!-- | ||
Based on reviewers feedback describe what additional tests need to be added prior | ||
implementing this enhancement to ensure the enhancements have also solid foundations. | ||
--> | ||
#### Unit Tests | ||
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In principle every added code should have complete unit test coverage, so providing | ||
the exact set of tests will not bring additional value. | ||
However, if complete unit test coverage is not possible, explain the reason of it | ||
together with explanation why this is acceptable. | ||
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Target is to keep same level or increase the coverage for all of the modified packages. | ||
Cover the critical part of newly created code. | ||
<!-- | ||
Additionally, try to enumerate the core package you will be touching | ||
to implement this enhancement and provide the current unit coverage for those | ||
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extending the production code to implement this enhancement. | ||
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- `<package>`: `<date>` - `<test coverage>` | ||
#### Integration tests | ||
<!-- | ||
Describe what tests will be added to ensure proper quality of the enhancement. | ||
After the implementation PR is merged, add the names of the tests here. | ||
--> | ||
We are going to cover the following scenario: | ||
Setup 2 distinct MultiKueue Admission Checks over the same multicluster. | ||
Each Admission Check with different set of adapters and different controller names. | ||
Prove that 2 different MultiKueue controllers can manage different job types runnning successfully in parallel. | ||
### Graduation Criteria | ||
<!-- | ||
Clearly define what it means for the feature to be implemented and | ||
considered stable. | ||
If the feature you are introducing has high complexity, consider adding graduation | ||
milestones with these graduation criteria: | ||
- [Maturity levels (`alpha`, `beta`, `stable`)][maturity-levels] | ||
- [Feature gate][feature gate] lifecycle | ||
- [Deprecation policy][deprecation-policy] | ||
[feature gate]: https://git.k8s.io/community/contributors/devel/sig-architecture/feature-gates.md | ||
[maturity-levels]: https://git.k8s.io/community/contributors/devel/sig-architecture/api_changes.md#alpha-beta-and-stable-versions | ||
[deprecation-policy]: https://kubernetes.io/docs/reference/using-api/deprecation-policy/ | ||
--> | ||
## Implementation History | ||
* 2024-06-20 First draft | ||
<!-- | ||
Major milestones in the lifecycle of a KEP should be tracked in this section. | ||
Major milestones might include: | ||
- the `Summary` and `Motivation` sections being merged, signaling SIG acceptance | ||
- the `Proposal` section being merged, signaling agreement on a proposed design | ||
- the date implementation started | ||
- the first Kubernetes release where an initial version of the KEP was available | ||
- the version of Kubernetes where the KEP graduated to general availability | ||
- when the KEP was retired or superseded | ||
--> | ||
## Drawbacks | ||
<!-- | ||
Why should this KEP _not_ be implemented? | ||
--> | ||
The proposed solution requires that another custom MultiKueue Admission Check is created aside from the one running for built-in Jobs. | ||
## Alternatives | ||
<!-- | ||
What other approaches did you consider, and why did you rule them out? These do | ||
not need to be as detailed as the proposal, but should include enough | ||
information to express the idea and why it was not acceptable. | ||
--> | ||
1. Dedicated API for MultiKueue communication between admission check controller and abstraction layer controller. | ||
2. Don't do any code changes, a custom controller can: | ||
Import `multikueue` and `jobframework`, add adapters and run the MultKiueue admission check controller. | ||
Will conflict with MultiKueue admission check controller in Kueue, which should be disabled (e.g. by command line parameter) in order to work. | ||
3. Instead of having MultiKueue cluster associated with controller name, change the Multikueue cluster status to use a custom active condition for old controllers (controller name) that use it. |
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title: MultiKueue external custom Job support | ||
kep-number: 2349 | ||
authors: | ||
- "@mszadkow" | ||
status: implementable | ||
creation-date: 2024-06-20 | ||
reviewers: | ||
- "@tenzen-y" | ||
- "@mimowo" | ||
- "@trasc" | ||
approvers: | ||
- "@tenzen-y" | ||
- "@mimowo" | ||
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see-also: | ||
- "/keps/693-multikueue" | ||
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# The target maturity stage in the current dev cycle for this KEP. | ||
stage: alpha | ||
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# The most recent milestone for which work toward delivery of this KEP has been | ||
# done. This can be the current (upcoming) milestone, if it is being actively | ||
# worked on. | ||
latest-milestone: "v0.8" | ||
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# The milestone at which this feature was, or is targeted to be, at each stage. | ||
milestone: | ||
alpha: "v0.8" | ||
beta: "v0.8" | ||
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