June 2021
Intermediate to advanced
335 pages
5h 50m
Chinese
Content preview from Kubernetes编程
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80
｜
第
3
章
不要在
Informer
中修改对象
从
Lister
往事件处理器传送的任何对象都是由
Informer
负责管理的，明
白这一点非常重要。如果你对它进行修改，可能会给你的应用程序带来
一些很难排查的缓存一致性问题。所以在修改对象前，一定要先进行一
次深拷贝（参见“
3.2 Go
语言中的
Kubernetes
对象”）。
总结来说，在修改一个对象前，先问问自己，谁负责管理这个对象及它
内部的结构体。下面是几条常见的规则：
•
Informer
和
Lister
负责管理它们返回的对象，所以使用这些对象时需
要先深拷贝再修改。
•
客户端返回新的对象，由调用者负责管理。
•
转换逻辑返回共享对象。如果调用者不负责管理传入的对象，那么它
就不负责管理返回的对象。
在前面的例子中，
Informer
的构造函数
NewSharedInformerFactory
会把某种
资源在所有命名空间中的所有对象都缓存在内部存储中。如果对于应用程序
来说这个量太大了，还可以改用其他更灵活的构造函数。
// NewFilteredSharedInformerFactory constructs a new instance of
// sharedInformerFactory. Listers obtained via this sharedInformerFactory will be
// subject to the same filters as specified here.
func NewFilteredSharedInformerFactory( ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.