read bandwidth 读出频宽
We focus on disk reads rather than disk writes, because the majority of disk accesses are for read operations, and the majority of disk bandwidth is used for read operations.
我们关注的是磁盘读取,而不是磁盘写,因为大部分磁盘访问都是为了进行读取操作,且大部分磁盘带宽也用于读取操作。
So, the user can read several article synopsis items on one page, and the server bandwidth is spared from building huge pages even if the user doesn't read it all.
因此,用户可以在一个页面中同时阅读几篇文章的概要内容,并且构建大量的页面会使服务的带宽不够,虽然用户并不会同时访问所有的页面。
To minimize global bandwidth consumption and read latency, HDFS tries to satisfy a read request from a replica that is closest to the reader.
副本的选择,为了降低整体的带宽消耗和读延时,HDFS会尽量让reader读最近的副本。
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