为什么很多nosql存储都是用java编写的？
据我所知，很多nosql存储都是用java编写的，例如HBase，Cassandra。但根据我的经验，很多高性能的服务器程序都是用c/c++编写的（例如Apache、Opensips等），为什么这样的java实现的程序在生产使用中能够表现良好？是因为Java代码很容易阅读吗？用java实现的维护和分布式系统扩展性很好吗？
BTW，我知道用Java写代码肯定效率更高，但是正如有人说的，在大公司实现速度不是问题，因为一旦实现并重构几轮，程序就可以运行得很好，所以时间成本从长远来看并不高。
As far as I know, many nosql stores are written in java, for example HBase, Cassandra. But according to my experience, many high performance server program are written in c/c++ (e.g. Apache, Opensips, etc.), why can such java-implementing program behave well in production use?Is it because that Java code is easy to read and maintain and distributed system implemented in java scales well?
BTW, I know that writing code in Java is sure more productive, but as someone said, implementation speed is not a question in big company, because once implemented and refactor for several rounds, the program can run very well, so the cost of time is not high for from a long term view.
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如果您点击右侧“相关”部分中的第一个链接（为什么 Cassandra 用 Java 编写），您将找到答案。
简短摘要：
< “根据定义，C/C++ 比 Java 更快”的神话只是一个神话。查看这个问题作为反例。
If you follow the first link (Why was Cassandra written in Java) in the "Related" section on the right, you will find answers.
Short summary:
EDIT The "C/C++ is faster than Java by definition" myth is just that - a myth. Look at this question for a counter example.