为什么 Cassandra 是用 Java 编写的? [英] Why was Cassandra written in Java?

问题描述

关于 Cassandra 的问题

为什么会有人用 Java 编写数据库引擎?
我能理解为什么你想要一个 Java 接口，但引擎...

我的印象是没有什么比 C/C++ 更快的了，数据库引擎不应该比最大速度慢，当然也不要使用垃圾收集......

谁能解释一下这有什么意义/为什么 Cassandra 可以比在 C/C++ 代码上运行的普通 SQL 更快?


很抱歉为什么是地球上的地狱"部分，但这对我来说真的没有任何意义.
我忽略了一个数据库，不像一般的花园式用户程序，只需要启动一次，然后运行很长时间，而且可能也是服务器上唯一的程序，这不言而喻重要的性能差异.

我更多地比较/参考了我在撰写本文时正在使用(或者更确切地说，更愿意使用)的功能失调"(委婉地说)Java 税收程序.

事实上，与使用 Java 编写税务程序不同，使用 Java 编写专用服务器程序非常有意义.

Question about Cassandra

Why the hell on earth would anybody write a database ENGINE in Java ?
I can understand why you would want to have a Java interface, but the engine...

I was under the impression that there's nothing faster than C/C++, and that a database engine shouldn't be any slower than max speed, and certainly not use garbage collection...

Can anybody explain me what possible sense that makes / why Cassandra can be faster than ordinary SQL that runs on C/C++ code ?


Sorry for the "Why the hell on earth" part, but it really didn't make any sense to me.
I neglected to consider that a database, unlike the average garden-varitety user programs, needs to be started only once and then runs for a very long time, and probably also as the only program on the server, which self-evidently makes for an important performance difference.

I was more comparing/referencing to a 'disfunctional' (to put it mildly) Java tax program I was using at the time of writing (or rather would have liked to use).

In fact, unlike using Java for tax programs, using Java for writing a dedicated server program makes perfect sense.

推荐答案

我可以看到几个原因:

• 安全性:用 Java 编写安全软件比用 C++ 编写安全软件更容易(还记得缓冲区溢出吗?)
• 性能:并没有那么糟糕.启动时肯定更糟，但是一旦代码启动并运行，这不是什么大事.实际上，您必须记住这里的一个重要点:VM 会不断优化 Java 代码，因此在某些情况下，它会比 C++ 更快

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