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    November 09

    Sina App Engine/SAE有些山寨

    bannerSina冷不丁搞出来一个SAE还是有些让人一惊的感觉,这个SAE是sina在最近几个月中研发完成的,目前处于Alpha状态,从其blog看,应该仅供内部开发人员测试使用,一共发布200个账号。正式些的版本估计要等到明年年初。

    SAE不是基于Python、Java或者Ruby,而是选择了目前最为流行的Web脚本PHP - 也是我较为熟悉的语言,心中也是不是冒出要搞个类似系统的念头。还是sina首先做了出来。就我个人而言,为什么GAE没有选择PHP这个如此流行的玩意,而是选择了Python和Java,可能主要原因在于PHP的管理能力不够,或者说想让PHP变得可管理较为困难一些。不知道SAE在PHP应用隔离方面是否有什么好的解决方案。

    SAE目前提供了一些开源的组件来支撑应用开发服务,如下(http://wiki.sae.sina.com.cn/doku.php):

  • PHP5 Runtime运行环境 - - - - 基于PHP 5.3.0内核

  • 支持读写分离的分布式数据库服务 - - - - 基于Mysql数据库

  • 分布式文件存储服务 - - - - 基于分布式文件系统

  • 基于Memcache协议的分布式缓存服务 - - - - 基于集群memcache系统

  • URLFetch远程数据抓取服务 - - - - 基于分布式proxy服务

  • Cronjob定时任务 - - - - 基于分布式定时器服务

  • SPP图片处理服务 - - - - 基于分布式高CPU计算服务

  • 其中分布式文件系统、SPP的详情并不为人知晓。MySQL则可能采用了Sharding技术,但是能够存储多大的容量,并没有看到SAE中有明确说明。另外,从这些服务中,我们并没有看到计费服务和用户绑定,这可能就是SAE尚是Alpha版本的原因。

    希望SAE能做的更好,挑战一下GAE:-)

    相关链接:
    1. http://sae.sina.com.cn/
    2. http://blog.sae.sina.com.cn/

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