为什么你不应该使用 MongoDB
我不构建数据库引擎，但搭建Web应用。每年我大约跑4-6个不同项目，所以我搭建了不少Web应用。我经历过有不同需求及不同的数据存储
免责声明：我不构建数据库引擎，但搭建Web应用。每年我大约跑4-6个不同项目，所以我搭建了不少Web应用。我经历过有不同需求及不同的数据存储需求的应用。我部署过你听说过或没听说过的的大部分数据存储。
我也有几次做出了错误的选择。这是一个关于其中一次的故事——原本我们为什么选择它，我们是如何发现它不合适，以及我们如何修复的。这一切都发生在一个开放源码的名为Diaspora的项目中。
Diaspora项目Diaspora 是一个有着悠久历史的分布式社交网络。早在2010年初，纽约大学四名大学生创建了一个Kickstarter视频，目的是募集10000美元，耗费一个夏天来构建一个替代Facebook的分布式项目。他们将它发送给朋友和家人，并希望有最好的结果。
但他们触到了痛处。当时正好有另一起关于Facebook的隐私丑闻，当尘埃落定，回到他们的Kickstarter项目时，他们已经从6400个不同的人那里筹集了超过200000美元，而同时这个软件项目，却连一行代码都还没有写出来。
Diaspora是第一个大大超越其目标的Kickstarter项目。其结局是，他们的项目新闻被刊登于纽约时报——但它变成了一个丑闻，，因为团队照片的背景黑板上面有一个肮脏的笑话，直到最终印刷都没有人注意到这一点。这可是刊登在纽约时报！这个事件的余波实际上是我第一次听说到这个项目。
他们在Kickstarter上成功的结果，是离开学校，来到San Francisco开始写代码。他们最后在我的办公室工作。那时我在Pivotal实验室工作，他们的一个哥哥也在那工作，所以Pivotal给他们提供了免费的办公空间、网络，当然，装有啤酒的冰箱。我白天和官方客户工作，下班后和他们一起玩，周末贡献代码。
他们最后在Pivotal待了两年多的时间。虽然只是在第一个暑假的结尾，他们已经有了一个最小化的，但已经可以使用（在某种意义上说）的一个分布式社交网络，以Ruby on Rails实现，后端用MongoDB。
这里有很多流行词汇，让我们把它分解来看。
“分布式社交网络”如果你看过《社交网络》，你就知道了所有你需要知道的关于Facebook的事。它是个web应用，它在一个单逻辑服务器上运行，它可以让你与朋友保持联系。一旦你登录，Diaspora的界面在结构上与Facebook很相似：
Diaspora用户界面的截图
在中间有个信息流，显示你所有朋友发布的信息，在边上有一些其他随机的基本没人关注过的东西。Diaspora和Facebook主要的技术差异在于对终端用户的不可见性：它是“分布的”部分。
MongoDB 的详细介绍：请点这里
MongoDB 的下载地址：请点这里
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