【文件属性】：
文件名称：java大数据作业_4Zookeeper
文件大小：25KB
文件格式：DOCX
更新时间：2021-02-12 16:47:40
java 大数据 Zookeeper
课后作业
1． 简述zookeeper在HBase中的作用
2． 如何获取链接zookeeper的客户端的信息
3． 简述如何用zookeeper实现一个普通的一对多fifo队列
4． 使用伪代码简述mapreduce的流程和中间结果
其中input和output都是fileinputformat和fileoutputformat
5. 编写程序实现倒排索引
首先准备数据：1.txt，文件内容如下：
The Apache Hadoop software library is a framework that allows for the distributed processing of large data sets across clusters of computers using simple programming models. It is designed to scale up from single servers to thousands of machines, each offering local computation and storage. Rather than rely on hardware to deliver high-availability, the library itself is designed to detect and handle failures at the application layer, so delivering a highly-available service on top of a cluster of computers, each of which may be prone to failures.
文件2.txt的内容如下所示：
In order to scale the name service horizontally, federation uses multiple independent Namenodes/Namespaces. The Namenodes are federated, that is, the Namenodes are independent and don’t require coordination with each other. The datanodes are used as common storage for blocks by all the Namenodes. Each datanode registers with all the Namenodes in the cluster. Datanodes send periodic heartbeats and block reports and handles commands from the Namenodes.
建立类似的文件，放入/test1文件夹下
要求处理结果为：
The 1.txt n 2.txt n
Apache 1.txt n 2.txt n
其中，n为某个单词在某个文件出现的次数，即，格式解释为：单词iterator<所在文件 出现次数>