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核心原理

informer监听特定resources的变化,驱动handler完成状态更新,监听过程包括edge-driven和level-driven,当resource本身发生更新时通知informer,执行update handler,这种称为edge-driven,然而,如果handler处理失败,这个event会发生丢失,kubernetes的方式是结合level-driven,执行 period reconcile,使得resource的状态和用户期望的状态最终保持一致。

也就是说kubernetes是有了edge-driven + level-driven俩种结合的方式保证resource的state和用户期望的状态做到最终一致。

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