18. (单选题) Hadoop框架中最核心的设计是什么？（  ）A为海量数据提供存储的HDFS和对数据进行计算的MapReduceB提供整个HDFS文件系统的NameSpace(命名空间)管理、块管理等所有服务CHadoop不仅可以运行在企业内部的集群中，也可以运行在云计算环境中DHadoop被视为事实上的大数据处理标准

Hadoop Distributed File System (HDFS)

Which Hadoop component is responsible for managing storage inHDFS?Question 29Answera. YARNb.Hivec. HDFSd.MapReduce

Using hdfs dfs -get or hdfs dfs -cat, you can verify that the results of this program are exactly thesame as the results of the MapReduce WordCount example that we saw in the first assignment.Copy the logs of the MapReduce framework (the output that you get in your terminal after the yarncommand) to a text file. We will come back to this later.

What is Hadoop

Topic 1: Introduction to Hadoop