缓存与递归正交...解释一下？

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想要改进这个问题吗？ Update the question所以它是on-topic用于堆栈溢出。

已关闭13 年前。

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Although it's true that some recursive-nameserver configurations are (sloppily) referred to as "caching", e.g., by RHEL/Fedora/CentOS, that's a really bad name for that function -- because caching is orthogonal to recursion.

Theoretically, you could write a nameserver that does recursive service but doesn't cache its results. (That would be a bit perverse, and I don't know of any.) Conversely, nameserver packages that cache but know nothing about how to recurse and instead do less-helpful alternative iterative service are common: dnsmasq, pdnsd, etc. ... ...

以上文字来源:http://linuxgazette.net/170/lan.html

请解释一下作者所说的“缓存与递归正交”是什么意思？

Answer 1

来自维基百科的definition of orthogonal :

For example, a car has orthogonal components and controls (e.g. accelerating the vehicle does not influence anything else but the components involved exclusively with the acceleration function).

作者的意思是，名称服务器是否缓存与是否可以递归无关。