为什么卡桑德拉用Java写的？ [英] Why was Cassandra written in Java?
问题描述
了解卡桑德拉问题
为什么地球上的地狱会有人用Java编写数据库引擎？
我能理解你为什么会希望有一个Java接口，但发动机...
我是IM pression，有什么比C / C ++更快之下，一个数据库引擎应该不会有什么比最大速度慢，而且肯定不会使用的垃圾收集...
任何人都可以解释我是什么感觉可能使/为什么卡桑德拉可以比对C / C ++ code运行普通的SQL更快？
编辑：的结果
对不起，部分地球上为什么地狱，但它真的没有任何意义了我。
我忘了考虑一个数据库，不像普通的花园varitety用户程序，需要进行一次启动，然后运行了很长一段时间，也可能作为服务器上的唯一方案，这不言而喻使一个重要的性能差异。
我更比较/参考，以我是用在写的时候了失去作用（说得客气一点）的Java税方案（或者说本来希望使用）。
事实上，与使用Java进行纳税程序，用Java编写一个专用的服务器程序是非常合情合理的。
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
我可以看到有几个原因：
I can see a few reasons:
- 安全性：它更容易用Java编写比C ++安全的软件 （记得缓冲区溢出？）
- 性能：它不是那么糟糕。这是definetely糟糕启动，但一旦code是启动和运行，它不是一个大的事情。其实，你必须要记住的重要一点：Java的code不断由VM进行了优化，所以在某些circunstances它得到更快然后C ++
- Security: it's easier to write secure software in Java than in C++ (remember the buffer overflows?)
- Performance: it's not THAT worse. It's definetely worse at startup, but once the code is up and running, it's not a big thing. Actually, you have to remember an important point here: Java code is continually optimized by the VM, so in some circunstances it get faster then C++
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