Canary Weighted Consistent Hashing

[2339478391]

Weighted Consistent Hashing

consider that
1.route 30% requests to canary backends just like what canary-weight did
2.the requests of a single user/device route to primary backends or canary backends randomly, it cause unconsistency
3.we want a single user routes to primary backends or canary backends all the time during the lifecycle

Add two new canary annotations
canary-consistency
it has two option, "header" or "cookie", means

header="userId" value="1" this userId routes to primary backends all the time
header="userId" value="2" this userId routes to canary backends all the time
or
cookie="userId" value="1" this userId routes to primary backends all the time
cookie="userId" value="2" this userId routes to canary backends all the time

canary-hash-seed
it's optional, it makes sure two experiments requests are different, the different seeds can result different hashcode

three old canary annotations are reused
canary-weight
canary-by-header
cookie

Compatibility
won't harm other canary strategies
but if canary-consistency is configured, other strategies won't work

[k8s-ci-robot]

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[k8s-ci-robot]

PR needs rebase.

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[k8s-ci-robot]

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[k8s-ci-robot]

Hi @2339478391. 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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[netlify]

❌ Deploy Preview for kubernetes-ingress-nginx failed. Why did it fail? →

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[longwuyuan]

The expectations from the canary feature are mostly being met for the large number of users of canary feature.

Adding new features is not being considered on the ingress-controller because the focus is to be secure by default while being compliant to the K8S ingress-api specs. The project is actually deprecating some features as its not a improvement to maintain & support features that impact security, stability & other such deliverables.

I don't think the project should implement the changes proposed here.

[github-actions]

This is stale, but we won't close it automatically, just bare in mind the maintainers may be busy with other tasks and will reach your issue ASAP. If you have any question or request to prioritize this, please reach #ingress-nginx-dev on Kubernetes Slack.

[k8s-triage-robot]

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/remove-lifecycle frozen