概念整理：hadoop核心：HDFS（分布式文件管理系统）与MapReduce（分布式计算框架） ----------------------------------------------HDFS------------------------------------------
概念：
① HDFS，它是一个文件系统，用于存储文件，通过目录树来定位文件；其次，它是分布式
Ambari is 100% open source and included in HDP, greatly simplifying installation and initial configuration of Hadoop clusters. In this article we’ll be running through some installation steps to get s
Hadoop分布式模式搭建过程遇到的问题9000端口未开放，报错“call from xxxx to xxxx:9000 failed on connection....connection refused”hadoop启动正常，端口开放正常，但是从节点无法连接主节点hadoop时间与ubuntu时间不一致，时区不对 9000端口未开放，报错“call from xxxx to xxxx:900
