CopyOnWrite的应用场景是啥样的？

Posted 2023-02-14

CopyOnWrite并发容器用于读多写少的并发场景。比如白名单，黑名单，商品类目的访问和更新场景，假如有一个搜索网站，用户在这个网站的搜索框中，输入关键字搜索内容，但是某些关键字不允许被搜索。这些不能被搜索的关键字会被放在一个黑名单当中，黑名单每天晚上更新一次。当用户搜索时，会检查当前关键字在不在黑名单当中，如果在，则提示不能搜索。 参考技术A Copy On Write意思是抄写。一般运用在课堂口语或者令口语。

例句
1
The Copy On Write technique allows both the parent and the child to read the same physical pages.
写时拷贝技术允许父进程和子进程读同一个物理页面。
2
If we let the parent run first, the Copy On Write mechanism would give rise to a series of unnecessary page duplications.
如果让父进程先运行，写时拷贝机制会产生一系列不必要的页复制。
3
But thanks to the Copy On Write mechanism, they usually get separate copies of the User Mode stack as soon as one tries to change the stack.
但由于写时拷贝机制，一旦其中之一试图改变栈时，它们通常会得到用户空间栈的一份独立的拷贝。
4
One of our executive creative directors didn ’ t just have a bar in his office. His office was a bar. It was a U-Shaped bar, beautiful mahogany, and he would sit behind the bar on the bar stool and write his copy.
我们公司一位执行创意总监不仅仅是在他的办公室开了一家酒吧，他的办公室就是一个酒吧，里面有一个U形吧台，使用漂亮的桃花心木制成，他会坐在吧台后面的高脚凳上撰写文案。
5
Over the years, I've tired to copy the example of Don and other friends who care enough to write uplifting comments, because I think they are on to something important.
多年以来，我努力效仿堂以及我的其他朋友，他们关心别人，常写一些鼓舞人心的话语，因为我觉得，他们这样做是很有意义的。