（ ）应用于大数据的数据采集阶段。
- A.MapReduce
- B.HDFS
- C.ETL
- D.HBase
正确答案及解析
正确答案
解析
大数据涉及的技术有：
（1）HDFS：Hadoop分布式文件系统（HDFS）是适合在通用硬件上的分布式文件系统，能提供高吞吐量的数据访问，非常适合大规模数据集上的应用。
（2）HBse：是一个分布式、面向列的开源数据库，是一个适合于非结构化数据存储的数据库。是基于列的模式。
（3）MapReduce：是一种编程模型，用于大规模数据集的并行运算。
（4）Chukwa：是一个开源的用于监控大型分布式系统的数据收集系统。还包含了一个用于展示、监控和分析已收集的数据的工具集。
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