Hongzhi

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## 问题描述 最近在学习 informer 机制,但是还是不太了解 resync 的实际用途,现在遇到如下问题: 在 pkg/controller/deployment/deployment_controller.go [101行](https://github.com/kubernetes/kubernetes/blob/c8ebc8ab75a9c36453cf6fa30990fd0a277d856d/pkg/controller/deployment/deployment_controller.go#L101) 中的 NewDeploymentController 会传入 DeploymentInformer 和 ReplicaSetInformer,为什么这两个 Informer 的 AddEventHandler 中 注册的 UpdateFunc “[dc.updateDeployment](https://github.com/kubernetes/kubernetes/blob/c8ebc8ab75a9c36453cf6fa30990fd0a277d856d/pkg/controller/deployment/deployment_controller.go#L173) [dc.updateReplicaSet](https://github.com/kubernetes/kubernetes/blob/c8ebc8ab75a9c36453cf6fa30990fd0a277d856d/pkg/controller/deployment/deployment_controller.go#L256)” updateReplicaSet 中有对比 ResourceVersion 的步骤而 updateDeployment 中没有?...