iSCSI SAN 的实现比较简单且便宜，因为它基于常用的标准组件。
The implementation of a iSCSI SAN is relatively simple and cheap because it is based on common standard components.
对于电话回传CM，其初始化过程不需要上行带宽分配和测距过程，技术实现比较简单。
Upstream bandwidth allocation and ranging are not required in the initialization of one way CM so the implement is simple.
清单 6 中的 map 实现比较简单：本质上是，Hadoop 为在输入文件中找到的每一行文本调用这个类。
My map implementation in Listing 6 is simple: Hadoop basically invokes this class for each line of text it finds in an input file.
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