Monday, May 2, 2016

Book Notes Misc


http://litaotao.github.io/books-recommend-and-summarize-on-apr-2016
之所以看官方这个文档,是因为一篇博文 45倍加速Spark的处理效率?,当时还挺惊讶的,于是乎想了解了解 spark + redis 会擦出什么样的火花。官方有两个文档,都挺简短的,在上面的链接里可以看到[感谢度娘,明明可以靠脸蛋儿]。总的来说,就是 redis 官方开发了一个 spark 的第三方包 spark-redis,支持 rdd 从 redis 里读取数据。that’s all。但是我看完文档后并不是很感冒,因为文档里的例子就一个,而且我并没有觉得 spark 里有特别需要从 redis 里读取数据的需求,实在需要,为什么不把数据 cache 到内存呢?为何还要走 redis 这条路,路越长越容易出错呀。而且,还有一个很大的问题是,既然用到了 spark,那么数据量一般都不会小,那么如果采用 spark + redis 的方案,是不是要考虑到 redis 扩容,容错的问题呢?那是不是要一个 redis cluster 呢?这个 redis cluster 是不是要和 spark cluster 在一起呢?如果在一起会不会互相有所影响呢?如果不在一起网络 IO 会不会让你情不自禁地说 fuck 呢?最重要的是,老板会问你是不是又要烧他的钱买机器了呢?
这是 coursera 上的一门公开课,讲商业谈判的。老师说话很清晰,课件也做得非常好,这门课我有单独做笔记的,稍后会放出来。就课程内容而言,我很喜欢,梳理了很多商业谈判的思考和执行流程,对销售人员我觉得用处很大。
http://litaotao.github.io/the-badest-thing-in-my-life


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