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client-go/cache: rewrite Replace to check queue first
This is useful to both reduce the code complexity, and to ensure clients get the "newest" version of an object known when its deleted. This is all best-effort, but for clients it makes more sense giving them the newest object they observed rather than an old one. This is especially useful when an object is recreated. eg. Object A with key K is in the KnownObjects store; - DELETE delta for A is queued with key K - CREATE delta for B is queued with key K - Replace without any object with key K in it. In this situation its better to create a DELETE delta with DeletedFinalStateUnknown with B (with this patch), than it is to give the client an DeletedFinalStateUnknown with A (without this patch). Signed-off-by: Odin Ugedal <[email protected]> Signed-off-by: Odin Ugedal <[email protected]> Kubernetes-commit: 4f55d416f2e6b566eb397670b451d96712e638f1
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