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Automated cherry pick of #107131: Fix default config flags#108401

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k8s-ci-robot merged 1 commit intokubernetes:release-1.23from
ulucinar:automated-cherry-pick-of-#107131-upstream-release-1.23
Mar 4, 2022
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Automated cherry pick of #107131: Fix default config flags#108401
k8s-ci-robot merged 1 commit intokubernetes:release-1.23from
ulucinar:automated-cherry-pick-of-#107131-upstream-release-1.23

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@ulucinar ulucinar commented Feb 28, 2022 •
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Cherry pick of #107131 on release-1.23.

#107131: Fix default config flags

For details on the cherry pick process, see the cherry pick requests page.

Fix kubectl config flags incorrectly setting burst and discovery limits

@jonnylangefeld @ulucinar
Fix default config flags
4c85abf 
This is a follow up to kubernetes#105520 which only changed the new default config flags in the `NewKubectlCommand` function if `kubeConfigFlags == nil`. However they are not nil because they were initialized before here:
https://github.com/kubernetes/kubernetes/blob/2fe968deb6cef4feea5bd0eb435e71844e397eed/staging/src/k8s.io/kubectl/pkg/cmd/cmd.go#L97

This fix uses the same defaults for both functions

Signed-off-by: Jonny Langefeld <jonny.langefeld@gmail.com>
@k8s-ci-robot k8s-ci-robot added this to the v1.23 milestone Feb 28, 2022
@k8s-ci-robot k8s-ci-robot added size/XS Denotes a PR that changes 0-9 lines, ignoring generated files. do-not-merge/cherry-pick-not-approved Indicates that a PR is not yet approved to merge into a release branch. cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. do-not-merge/release-note-label-needed Indicates that a PR should not merge because it's missing one of the release note labels. do-not-merge/needs-kind Indicates a PR lacks a `kind/foo` label and requires one. do-not-merge/needs-sig Indicates an issue or PR lacks a `sig/foo` label and requires one. needs-triage Indicates an issue or PR lacks a `triage/foo` label and requires one. labels Feb 28, 2022
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k8s-ci-robot commented Feb 28, 2022

Hi @ulucinar. Thanks for your PR.

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@k8s-ci-robot k8s-ci-robot added needs-ok-to-test Indicates a PR that requires an org member to verify it is safe to test. needs-priority Indicates a PR lacks a `priority/foo` label and requires one. labels Feb 28, 2022
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ulucinar commented Mar 1, 2022

As detailed here, in kubectl@v1.23.4 discovery client uses a token bucket rate limiter (tbrl) with a burstiness of 100 and a fill rate of 5.0 qps, whereas the intended parameters are (b=300, r=50.0 qps). According to our observations reported in the aforementioned document, this greatly hinders the performance of the discovery client used by kubectl when there are a large number of API GroupVersions. For example, in a cluster with ~190 GVs, discovery client using a tbrl(b=100, r=5.0 qps) with an empty cache is throttled for a max period of ~18.4 s. However, a discovery client using a tbrl(b=300, r=50.0 qps) as intended, is throttled for a max period of ~1.8 s.

This has already been fixed in the master branch. The planned release date for kubectl@v1.24.0 is in April 2022. Thus we propose to have the fix available starting with kubectl@v1.23.5, also considering client/server version skew guidelines. Thank you very much in advance.

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eddiezane commented Mar 1, 2022

/release-note-edit

Fix kubectl config flags incorrectly setting burst and discovery limits

@k8s-ci-robot k8s-ci-robot added release-note Denotes a PR that will be considered when it comes time to generate release notes. and removed do-not-merge/release-note-label-needed Indicates that a PR should not merge because it's missing one of the release note labels. labels Mar 1, 2022
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eddiezane commented Mar 1, 2022

/kind bug
/ok-to-test

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eddiezane commented Mar 2, 2022 •
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This cherry pick does not impact users and fixes an incomplete library usage for community projects.

/approve

/assign @kubernetes/release-engineering

@k8s-ci-robot k8s-ci-robot added the approved Indicates a PR has been approved by an approver from all required OWNERS files. label Mar 2, 2022
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ulucinar commented Mar 2, 2022

Thank you @eddiezane. I've also considered cherry-picking this fix to the other active release branches release-1.21 and release-1.22. However, it turns out that in those versions, we don't have the genericclioptions.ConfigFlags. WithDiscoveryQPS, which the fix depends on. Thus we cannot simply cherry-pick. We can still fix the issue in those branches via separate new changes/PRs but would that be allowed for those branches?

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cpanato commented Mar 2, 2022

@ulucinar @eddiezane this is only needed for release-1.23 branch? how about 1.22 and 1.21?

also need a lgtm from the review owners

/assign @soltysh

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eddiezane commented Mar 2, 2022

The original landed in 1.23 so I think only that branch. #105520

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/lgtm
/triage accepted

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soltysh commented Mar 3, 2022

/priority backlog

@k8s-ci-robot k8s-ci-robot added priority/backlog Higher priority than priority/awaiting-more-evidence. lgtm "Looks good to me", indicates that a PR is ready to be merged. and removed needs-priority Indicates a PR lacks a `priority/foo` label and requires one. labels Mar 3, 2022
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/lgtm

@saschagrunert saschagrunert added cherry-pick-approved Indicates a cherry-pick PR into a release branch has been approved by the release branch manager. and removed do-not-merge/cherry-pick-not-approved Indicates that a PR is not yet approved to merge into a release branch. labels Mar 4, 2022
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k8s-ci-robot commented Mar 4, 2022

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: eddiezane, saschagrunert, soltysh, ulucinar

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@k8s-ci-robot k8s-ci-robot merged commit 4f8f197 into kubernetes:release-1.23 Mar 4, 2022
@ulucinar ulucinar deleted the automated-cherry-pick-of-#107131-upstream-release-1.23 branch March 9, 2022 10:59
@ulucinar ulucinar mentioned this pull request Mar 11, 2022
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@soltysh soltysh soltysh approved these changes

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@eddiezane eddiezane Awaiting requested review from eddiezane

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