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Introduce dynamic throttling for NEG requests #2124

Merged
merged 9 commits into from
Jun 20, 2023
Merged

Introduce dynamic throttling for NEG requests #2124

merged 9 commits into from
Jun 20, 2023

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alexkats
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@alexkats alexkats commented May 18, 2023 •
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The purpose of this whole PR is to introduce the dynamic throttling mechanism for NEG requests (List/Attach/DetachNetworkEndpoints) that should be more flexible than static QPS rate limiter

@k8s-ci-robot k8s-ci-robot added the cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. label May 18, 2023
@k8s-ci-robot k8s-ci-robot added the needs-ok-to-test Indicates a PR that requires an org member to verify it is safe to test. label May 18, 2023
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Hi @alexkats. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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@k8s-ci-robot k8s-ci-robot added the size/XXL Denotes a PR that changes 1000+ lines, ignoring generated files. label May 18, 2023
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/assign @swetharepakula
/assign @bowei

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/ok-to-test

@k8s-ci-robot k8s-ci-robot added ok-to-test Indicates a non-member PR verified by an org member that is safe to test. and removed needs-ok-to-test Indicates a PR that requires an org member to verify it is safe to test. labels May 22, 2023
bowei
bowei reviewed May 22, 2023
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pkg/neg/syncers/backoff.go
NextDelay() (time.Duration, error)
// ResetDelay resets the retry delay
ResetDelay()
// DecreaseDelay returns the decreased delay for next retry
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This is kind of confusing -- does this have a side effect and also returns a value?

When will this be called etc vs ResetDelay? I think the other methods are more intuitive and their documentation is sufficient, but DecreaseDelay is somewhat out of ordinary understanding.

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I remember to make the same comment, I can't think on having a backoff handler that decrease, I can see how can be useful to have Reset() method to start over, but allowing to go up and down is indeed confusing

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The intended usage for it is inside throttling strategy (which is introduced in later commits). The dynamic strategy tries to adjust the delay based on the previous request results, and that's the place where all three methods are used, including DecreaseDelay

@k8s-ci-robot k8s-ci-robot added the needs-rebase Indicates a PR cannot be merged because it has merge conflicts with HEAD. label May 24, 2023
swetharepakula
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Generally, the logic looks good. Main comment is to comment both the code and the tests

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pkg/neg/syncers/backoff_test.go Outdated Show resolved Hide resolved
pkg/neg/syncers/backoff_test.go Outdated Show resolved Hide resolved
pkg/neg/syncers/backoff_test.go Outdated Show resolved Hide resolved
pkg/ratelimit/ratelimit_test.go Show resolved Hide resolved
pkg/ratelimit/metrics/metrics.go Outdated Show resolved Hide resolved
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pkg/ratelimit/metrics/metrics.go Outdated Show resolved Hide resolved
@k8s-ci-robot k8s-ci-robot removed the needs-rebase Indicates a PR cannot be merged because it has merge conflicts with HEAD. label Jun 2, 2023
@alexkats alexkats force-pushed the neg-dt branch 2 times, most recently from 4857901 to 9d82824 Compare June 2, 2023 19:21
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alexkats commented Jun 2, 2023

/retest

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one comment about the metrics, otherwise LGTM

swetharepakula
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one comment about the metrics, otherwise LGTM

@alexkats alexkats force-pushed the neg-dt branch 2 times, most recently from c06446c to 78ccdbc Compare June 20, 2023 09:36
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Thanks Alex!

/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 Jun 20, 2023
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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alexkats, swetharepakula

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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 Jun 20, 2023
@k8s-ci-robot k8s-ci-robot merged commit 80f2d99 into kubernetes:master Jun 20, 2023
@alexkats alexkats deleted the neg-dt branch June 21, 2023 21:17
@alexkats alexkats mentioned this pull request Dec 20, 2023
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