一.查看HDFS下的参数信息 [root@master ~]# hdfs Usage: hdfs [--config confdir] COMMAND where COMMAND is one of: dfs run a filesystem command on the file systems supported in Hadoop. namenode -format format the DFS filesystem secondarynamenode run the DFS second
简介 HDFS(Hadoop Distributed File System )Hadoop分布式文件系统.是根据google发表的论文翻版的.论文为GFS(Google File System)Google 文件系统(中文,英文). HDFS有很多特点: ① 保存多个副本,且提供容错机制,副本丢失或宕机自动恢复.默认存3份. ② 运行在廉价的机器上. ③ 适合大数据的处理.多大?多小?HDFS默认会将文件分割成block,64M为1个block.然后将block按键值对存储在HDFS上,并将键
This document describes how to install and configure Wordpress 4.0 on CentOS 7.0. WordPress started in 2003 with a single bit of code to enhance the typography of everyday writing and with fewer users than you can count on your fingers and toes. Sinc