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client-go: share the same transport for generated clientsets#105490

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aojea:restclient-shared-transport
Oct 20, 2021
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client-go: share the same transport for generated clientsets#105490
k8s-ci-robot merged 7 commits intokubernetes:masterfrom
aojea:restclient-shared-transport

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@aojea aojea commented Oct 5, 2021 •
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/kind bug
/kind cleanup

Until now, when creating a Kubernetes Clientset, a new RESTClient was created per group/version. Since RESTClient transport can not be cached in some occasions, i.e. when using a custom transport, this has the consequence that each group/version had an independent TCP connection to the API server.

Since the Transport, of the RESTClient can be shared when creating a global Kubernetes Clientset, this PR adds a new RESTClient constructor RESTClientForConfigAndClient to allow to generate clientsets using the same http client.

Fixes #91913, #103225

client-go uses the same http client for all the generated groups and versions, allowing to share customized transports for multiple groups versions.

@k8s-ci-robot k8s-ci-robot added do-not-merge/work-in-progress Indicates that a PR should not merge because it is a work in progress. do-not-merge/release-note-label-needed Indicates that a PR should not merge because it's missing one of the release note labels. size/XXL Denotes a PR that changes 1000+ lines, ignoring generated files. cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. 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. needs-priority Indicates a PR lacks a `priority/foo` label and requires one. area/code-generation area/test sig/api-machinery Categorizes an issue or PR as relevant to SIG API Machinery. sig/auth Categorizes an issue or PR as relevant to SIG Auth. sig/instrumentation Categorizes an issue or PR as relevant to SIG Instrumentation. sig/testing Categorizes an issue or PR as relevant to SIG Testing. and removed do-not-merge/needs-sig Indicates an issue or PR lacks a `sig/foo` label and requires one. labels Oct 5, 2021
@aojea aojea force-pushed the restclient-shared-transport branch 2 times, most recently from 8a42af3 to 0c5ce9d Compare October 5, 2021 16:58
@aojea aojea mentioned this pull request Oct 5, 2021
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@aojea aojea force-pushed the restclient-shared-transport branch from 0c5ce9d to acb56c2 Compare October 6, 2021 08:49
@aojea aojea changed the title [WIP] Restclient shared transport client-go: share the same transport for generated clientsets Oct 6, 2021
@k8s-ci-robot k8s-ci-robot removed the do-not-merge/work-in-progress Indicates that a PR should not merge because it is a work in progress. label Oct 6, 2021
@aojea aojea mentioned this pull request Oct 6, 2021
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@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 Oct 6, 2021
@aojea aojea force-pushed the restclient-shared-transport branch from 0c8187b to cfe8d4c Compare October 6, 2021 10:05
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aojea commented Oct 6, 2021

/kind bug
/kind cleanup
/assign @liggitt
/cc @yliaog
/triage accepted

@fedebongio this supersedes #105432 (comment)

This is working now, there was a bug for the clientset generated without a custom transport because it wasn't using the configured Timeout option.
It was hidden because only showed up with this change, 🤔 something in the generated chain should be fixing it, I've added an unit test to verify it.

@k8s-ci-robot k8s-ci-robot requested a review from yliaog October 6, 2021 10:57
@aojea aojea force-pushed the restclient-shared-transport branch from 46cb4a2 to 032d0d6 Compare October 20, 2021 04:39
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liggitt commented Oct 20, 2021

/lgtm
/approve

@k8s-ci-robot k8s-ci-robot added the lgtm "Looks good to me", indicates that a PR is ready to be merged. label Oct 20, 2021
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k8s-ci-robot commented Oct 20, 2021

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aojea, liggitt

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@k8s-ci-robot k8s-ci-robot added the approved Indicates a PR has been approved by an approver from all required OWNERS files. label Oct 20, 2021
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aojea commented Oct 20, 2021

There are no nodes that your pod can schedule to - check your requests, tolerations, and node selectors (skip schedule deleting pod: test-pods/af2ebe83-31c2-11ec-9c4e-3231390c1bb4)

/test pull-kubernetes-verify-govet-levee

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k8s-ci-robot commented Oct 20, 2021

@aojea: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name Commit Details Required Rerun command
pull-kubernetes-unit 032d0d6 link unknown /test pull-kubernetes-unit

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. I understand the commands that are listed here.

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aojea commented Oct 20, 2021

k8s.io/kubernetes/pkg/registry/core/service/storage: TestFeatureExternalTrafficPolicy/LoadBalancer_policy:Cluster_hcnp:none_policy:Local_hcnp:specified expand_more 0s
k8s.io/kubernetes/pkg/registry/core/service/storage: TestFeatureExternalTrafficPolicy expand_more

/test pull-kubernetes-unit

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aojea commented Oct 20, 2021

=== RUN TestFeatureExternalTrafficPolicy/LoadBalancer_policy:Cluster_hcnp:none_policy:Local_hcnp:specified
I1020 16:48:40.327679 63217 alloc.go:821] Transition to LoadBalancer type service with ExternalTrafficPolicy=Local
storage_test.go:774: unexpected error updating service: Internal error occurred: failed to allocate requested HealthCheck NodePort 30000: provided port is already allocated
W1020 16:48:40.385152 63217 clientconn.go:1326] [core] grpc: addrConn.createTransport failed to connect to {localhost:38187 localhost 0 }. Err: connection error: desc = "transport: Error while dialing dial tcp [::1]:38187: connect: connection refused". Reconnecting...
W1020 16:48:40.396525 63217 clientconn.go:1326] [core] grpc: addrConn.createTransport failed to connect to {localhost:33473 localhost 0 }. Err: connection error: desc = "transport: Error while dialing dial tcp [::1]:33473: connect: connection refused". Reconnecting...
--- FAIL: TestFeatureExternalTrafficPolicy/LoadBalancer_policy:Cluster_hcnp:none_policy:Local_hcnp:specified (0.08s)

that sounds like a flake

@k8s-ci-robot k8s-ci-robot merged commit 881980a into kubernetes:master Oct 20, 2021
@k8s-ci-robot k8s-ci-robot added this to the v1.23 milestone Oct 20, 2021
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