寫在最前注意：
1、master，slave都需要修改start-dfs.sh，stop-dfs.sh，start-yarn.sh，stop-yarn.sh四個文件
2、如果你的Hadoop是另外啟用其它用戶來啟動，記得將root改為對應用戶

HDFS格式化后啟動dfs出現以下錯誤：

[root@master sbin]# ./start-dfs.sh Starting namenodes on [master] ERROR: Attempting to operate on hdfs namenode as root ERROR: but there is no HDFS_NAMENODE_USER defined. Aborting operation. Starting datanodes ERROR: Attempting to operate on hdfs datanode as root ERROR: but there is no HDFS_DATANODE_USER defined. Aborting operation. Starting secondary namenodes [slave1] ERROR: Attempting to operate on hdfs secondarynamenode as root ERROR: but there is no HDFS_SECONDARYNAMENODE_USER defined. Aborting operation.

查度娘，見一仁兄的博客有次FAQ，故參考處理順便再做一記錄
參考地址：https://blog.csdn.net/u013725455/article/details/70147331

在/hadoop/sbin路徑下：
將start-dfs.sh，stop-dfs.sh兩個文件頂部添加以下參數

#!/usr/bin/env bash HDFS_DATANODE_USER=root HADOOP_SECURE_DN_USER=hdfs HDFS_NAMENODE_USER=root HDFS_SECONDARYNAMENODE_USER=root

還有，start-yarn.sh，stop-yarn.sh頂部也需添加以下：

#!/usr/bin/env bash YARN_RESOURCEMANAGER_USER=root HADOOP_SECURE_DN_USER=yarn YARN_NODEMANAGER_USER=root

修改后重啟 ./start-dfs.sh，成功！

[root@master sbin]# ./start-dfs.sh WARNING: HADOOP_SECURE_DN_USER has been replaced by HDFS_DATANODE_SECURE_USER. Using value of HADOOP_SECURE_DN_USER. Starting namenodes on [master] 上一次登錄：日 6月 3 03:01:37 CST 2018從 slave1pts/2 上 master: Warning: Permanently added 'master,192.168.43.161' (ECDSA) to the list of known hosts. Starting datanodes 上一次登錄：日 6月 3 04:09:05 CST 2018pts/1 上 Starting secondary namenodes [slave1] 上一次登錄：日 6月 3 04:09:08 CST 2018pts/1 上 創作挑戰賽新人創作獎勵來咯，堅持創作打卡瓜分現金大獎

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