Federated Hpa feature doc #5487

irfanurrehman · 2017-09-15T19:48:35Z

cc @kubernetes/sig-federation-pr-reviews @kubernetes/sig-federation-feature-requests
cc @quinton-hoole

This change is

k8sio-netlify-preview-bot · 2017-09-15T19:50:36Z

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zacharysarah · 2017-09-15T20:35:03Z

@irfanurrehman 👋 I'd like to make some small edits. Would you please make sure that the box to allow edits from maintainers is checked?

irfanurrehman · 2017-09-15T21:56:18Z

@irfanurrehman I'd like to make some small edits. Would you please make sure that the box to allow edits from maintainers is checked?

@zacharysarah apologies for missing it while raising the PR. Done now.

ghost · 2017-09-15T22:32:12Z

Review status: 0 of 3 files reviewed at latest revision, 6 unresolved discussions.

docs/tasks/administer-federation/hpa.md, line 2 at r1 (raw file):

---
title: Federated Hpas

I'd spell it out: "Federated Horizontal Pod Autoscalers (HPA)"

docs/tasks/administer-federation/hpa.md, line 6 at r1 (raw file):

{% capture overview %}
This guide explains how to use Hpas in the Federation control plane.

HPA's ?

docs/tasks/administer-federation/hpa.md, line 65 at r1 (raw file):

Once a federated Hpa is created, the federation control plane will partition and
create an Hpa in all underlying Kubernetes clusters.

Please mention cluster selectors to restrict the clusters into which the HPA gets federated.

docs/tasks/administer-federation/hpa.md, line 118 at r1 (raw file):

## Deleting a Federated Hpa

You can delete a federated Hpa as you would delete a Kubernetes

I think it's worth mentioning that this will delete all underlying HPA's, if cascading deletion is used.

docs/tasks/administer-federation/hpa.md, line 131 at r1 (raw file):

To a `federation user` interacting with federated control plane (or simply federation),
the interaction is same as interacting with a normal k8s cluster (but with a limited set of

'almost identical' rather than 'the same'.

docs/tasks/administer-federation/hpa.md, line 146 at r1 (raw file):

they are needed most, or in other words where the load is more. Federated hpa feature
achieves this by manipulating the min and max replicas on the hpas it creates in the
federated clusters. It reduces the max and min replicas from those clusters which does

I think you need to be clearer here that the federation does not actually monitor the CPU utilization itself, but rather relies on the underlying cluster HPA's to do the auto-scaling, and only re-assigns min and max replicas between clusters in an attempt to prevent individual clusters from running up against their max replica limits. A brief example might help to clarify this.

Comments from Reviewable

ghost · 2017-09-15T22:33:52Z

I made a few suggested edits. None of them are showstoppers, and can be addressed in a followup PR if necessary.

tengqm · 2017-09-16T12:27:01Z

docs/tasks/administer-federation/hpa.md

+except in the number of min and max replicas. The federation control plane
+will ensure that the sum of max replicas in each cluster matches the specified
+max replicas on the federated hpa object and sum of min replicas will be greater
+then or equal to the min specified on the federated hpa object. The sum of min


then -> than

tengqm · 2017-09-16T12:30:50Z

docs/tasks/administer-federation/hpa.md

+will ensure that the sum of max replicas in each cluster matches the specified
+max replicas on the federated hpa object and sum of min replicas will be greater
+then or equal to the min specified on the federated hpa object. The sum of min
+is greater or equal to specified min because an Hpa into a particular cluster


greater -> greater than

tengqm · 2017-09-16T12:41:37Z

docs/tasks/administer-federation/hpa.md

+
+By default, first max replicas are spread equally in all the underlying clusters
+and then min replicas are distributed to those clusters which got max. This means
+that each cluster will get an hpa if the max replicas specified are greater then


are greater then -> is greater than

tengqm · 2017-09-16T12:43:00Z

docs/tasks/administer-federation/hpa.md

+and then min replicas are distributed to those clusters which got max. This means
+that each cluster will get an hpa if the max replicas specified are greater then
+the total clusters participating in this federation and some clusters will be
+skipped if max replicas specified are lesser then the total clusters participating


are lesser then -> is less than

tengqm · 2017-09-16T12:46:13Z

docs/tasks/administer-federation/hpa.md

+
+To a `federation user` interacting with federated control plane (or simply federation),
+the interaction is same as interacting with a normal k8s cluster (but with a limited set of
+apis, that which are federated). As both deployments and horizontalpodautoscalers are


apis, that which are federated -> APIs that are federated

irfanurrehman · 2017-09-17T20:07:24Z

I have updated the doc to fix the review comments.

Review status: 0 of 3 files reviewed at latest revision, 11 unresolved discussions.

docs/tasks/administer-federation/hpa.md, line 2 at r1 (raw file):

Previously, quinton-hoole (Quinton Hoole) wrote…

I'd spell it out: "Federated Horizontal Pod Autoscalers (HPA)"

Done.

docs/tasks/administer-federation/hpa.md, line 6 at r1 (raw file):

Previously, quinton-hoole (Quinton Hoole) wrote…

HPA's ?

made hpa -> HPA at all places in the doc.

docs/tasks/administer-federation/hpa.md, line 65 at r1 (raw file):

Previously, quinton-hoole (Quinton Hoole) wrote…

Please mention cluster selectors to restrict the clusters into which the HPA gets federated.

Done.

docs/tasks/administer-federation/hpa.md, line 79 at r1 (raw file):

Previously, tengqm (Qiming) wrote…

then -> than

Done.

docs/tasks/administer-federation/hpa.md, line 80 at r1 (raw file):

Previously, tengqm (Qiming) wrote…

greater -> greater than

Done.

docs/tasks/administer-federation/hpa.md, line 88 at r1 (raw file):

Previously, tengqm (Qiming) wrote…

are greater then -> is greater than

Updated the sentence, please check if still sounds wrong.

docs/tasks/administer-federation/hpa.md, line 90 at r1 (raw file):

Previously, tengqm (Qiming) wrote…

are lesser then -> is less than

Updated the sentence, please check if still sounds wrong.

docs/tasks/administer-federation/hpa.md, line 118 at r1 (raw file):

Previously, quinton-hoole (Quinton Hoole) wrote…

I think it's worth mentioning that this will delete all underlying HPA's, if cascading deletion is used.

Done.

docs/tasks/administer-federation/hpa.md, line 131 at r1 (raw file):

Previously, quinton-hoole (Quinton Hoole) wrote…

'almost identical' rather than 'the same'.

Done.

docs/tasks/administer-federation/hpa.md, line 132 at r1 (raw file):

Previously, tengqm (Qiming) wrote…

apis, that which are federated -> APIs that are federated

Done.

docs/tasks/administer-federation/hpa.md, line 146 at r1 (raw file):

Previously, quinton-hoole (Quinton Hoole) wrote…

I think you need to be clearer here that the federation does not actually monitor the CPU utilization itself, but rather relies on the underlying cluster HPA's to do the auto-scaling, and only re-assigns min and max replicas between clusters in an attempt to prevent individual clusters from running up against their max replica limits. A brief example might help to clarify this.

Done.

Comments from Reviewable

irfanurrehman · 2017-09-18T07:21:53Z

@quinton-hoole @zacharysarah
I think this PR should wait for kubernetes/kubernetes#49950 to get merged.
I believe that would happen when the code freeze is lifted.

ghost · 2017-09-22T17:30:04Z

The PR kubernetes/kubernetes#49950 has merged. All edits /lgtm. This can be merged.

steveperry-53 · 2017-09-22T22:48:09Z

I'll start a docs review now.

steveperry-53 · 2017-09-22T23:10:17Z

@irfanurrehman See 30df752 for suggested edits.

steveperry-53 · 2017-09-25T20:20:13Z

@irfanurrehman Ping. As far as I know, we're still shooting for a 9/27 release.

ghost · 2017-09-25T20:38:01Z

Thanks @steveperry-53 . Yes, still aiming at 9/27 release. Perhaps @irfanurrehman was unaware that he was responsible for applying your edits. Is the documentation process that we should follow documented somewhere? Any pointers much appreciated.

zacharysarah · 2017-09-25T21:37:41Z

@quinton-hoole 👋

Perhaps @irfanurrehman was unaware that he was responsible for applying your edits.

Generally, docs contributors provide reviews and perform small edits.* In the case of more extensive edits, docs contributors provide feedback for a PR owner to implement. In the case of this PR specifically, I edited 30df752 last week; Steve's feedback referenced that PR.

Is the documentation process that we should follow documented somewhere?

Not in terms of PR review. Looking at the README and the contribution guidelines, there's definitely room to set clearer expectations. I've opened an issue to improve the review process: #5620

For now, we need either:

@irfanurrehman to push a commit that incorporates updates
@irfanurrehman to un-check and re-check the box allowing edits from maintainers

[*]The GitHub UI has a known issue: edits from maintainers are allowed only if the PR owner un-checks and re-checks the "allow edits from maintainers" box after the PR is created.

steveperry-53 · 2017-09-25T22:10:40Z

@quinton-hoole @zacharysarah @irfanurrehman, We don't need anyone to check the Allow edits box, and we don't need @irfanurrehman to push anything. I already pushed a commit with suggested edits. All we need is for someone to agree to what I've done in 30df752.

ghost · 2017-09-25T23:54:47Z

@steveperry-53 Yes, thanks, 30df752 looks fine.

/lgtm

Let me know if you need us to do anything else.

steveperry-53 · 2017-09-26T00:16:30Z

Reviewed 2 of 3 files at r1, 1 of 1 files at r4.
Review status: all files reviewed at latest revision, 11 unresolved discussions.

Comments from Reviewable

steveperry-53 · 2017-09-26T00:23:15Z

@quinton-hoole Thanks for the lgtm.

@quinton-hoole, @zacharysarah Can one of you help get the code-review/reviewable to be green. To this day, I am mystified by Reviewable. Thanks. And if this isn't easy, I'm happy to merge this without a green check on the Reviewable line.

steveperry-53 · 2017-09-26T00:26:57Z

Review status: all files reviewed at latest revision, 12 unresolved discussions.

Comments from Reviewable

@chenopis

* GC now supports non-core resources * Add two examples about how to analysis audits of kube-apiserver (#4264) * Deprecate system:nodes binding * [1.8] StatefulSet `initialized` annotation is now ignored. * inits the kubeadm upgrade docs addresses /issues/4689 * adds kubeadm upgrade cmd to ToC addresses /issues/4689 * add workload placement docs * ScaleIO - document udpate for 1.8 * Add documentation on storageClass.mountOptions and PV.mountOptions (#5254) * Add documentation on storageClass.mountOptions and PV.mountOptions * convert notes into callouts * Add docs for CustomResource validation add info about supported fields * advanced audit beta features (#5300) * Update job workload doc with backoff failure policy (#5319) Add to the Jobs documentation how to use the new backoffLimit field that limit the number of Pod failure before considering the Job as failed. * Documented additional AWS Service annotations (#4864) * Add device plugin doc under concepts/cluster-administration. 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(#5399) * Document extended resources and OIR deprecation. * Updated extended resources doc per reviews. * reverts extra spacing in _data/tasks.yml * addresses `kubeadm upgrade` review comments Feedback from @chenopis, @luxas, and @steveperry-53 addressed with this commit * HugePages documentation (#5419) * Update cpu-management-policies.md (#5407) Fixed the bad link. Modified "cpu" to "CPU". 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Add this feature into the doc. * Update manage-compute-resources-container.md * Update manage-compute-resources-container.md * Update manage-compute-resources-container.md * Update manage-compute-resources-container.md * Update manage-compute-resources-container.md * Update manage-compute-resources-container.md * Added documentation for Metrics Server (#5560) * authorization: improve authorization debugging docs (#5549) * Document mount propagation (#5544) * Update /docs/setup/independent/create-cluster-kubeadm.md for 1.8. 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k8s-ci-robot added size/L Denotes a PR that changes 100-499 lines, ignoring generated files. cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. labels Sep 15, 2017

k8s-github-robot assigned zacharysarah Sep 15, 2017

Federated Hpa feature doc

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ghost mentioned this pull request Sep 15, 2017

Federated Pod AutoScaler feature kubernetes/enhancements#257

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tengqm reviewed Sep 16, 2017

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Federated Hpa feature doc review fixes

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tengqm approved these changes Sep 18, 2017

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steveperry-53 added this to the 1.8 milestone Sep 18, 2017

Update hpa.md

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steveperry-53 self-assigned this Sep 22, 2017

Update hpa.md

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Federated Hpa feature doc #5487

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