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[hadoop@zui hadoop]$ hadoop namenode -format
WARNING: Use of this script to execute namenode is deprecated.
WARNING: Attempting to execute replacement "hdfs namenode" instead.
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namenode is running as process 18452. Stop it first.
(3.0.3使用 ： hdfs namenode -formate)
[hadoop@zui hadoop]$ stop-dfs.sh
Stopping namenodes on [zui]
zui: Warning: Permanently added 'zui' (ECDSA) to the list of known hosts.
zui: ERROR: Unable to kill 18452
Stopping datanodes
localhost: ERROR: Unable to kill 19132
Stopping secondary namenodes [zui]
zui: ERROR: Unable to kill 19311
[hadoop@zui hadoop]$ stop-all.sh
WARNING: Stopping all Apache Hadoop daemons as hadoop in 10 seconds.
WARNING: Use CTRL-C to abort.
Stopping namenodes on [zui]
zui: ERROR: Unable to kill 18452
Stopping datanodes
localhost: ERROR: Unable to kill 19132
Stopping secondary namenodes [zui]
zui: ERROR: Unable to kill 19311
Stopping nodemanagers
Stopping resourcemanager
[hadoop@zui hadoop]$ hdfs namenode -format
namenode is running as process 18452. Stop it first.
[hadoop@zui hadoop]$ kill -9 18452
bash: kill: (18452) - No such process
[hadoop@zui hadoop]$ sudo kill -9 18452
[sudo] password for hadoop:
hadoop is not in the sudoers file. This incident will be reported.
(使用root kill 进程)
[hadoop@zui hadoop]$ su root
Password:
[root@zui hadoop]# kill -9 18452
bash: kill: (18452) - No such process
[root@zui hadoop]# sudo kill -9 18452
kill: sending signal to 18452 failed: No such process
[root@zui hadoop]#
（该进程是否只有在hadoop同户下才可以查到，但是hadoop使用也显示没有这个进程，加上sudo提示hadoop not in the sudoers file)
添加hadoop到 sudoers ：
例子：引用来自 ： https://www.cnblogs.com/dingtian/p/7771046.html
切换用户至root
vim /etc/sudoers
找到root ALL=(ALL) ALL，在下方新增
stack ALL=(ALL) NOPASSWD: ALL
wq!
强制保存并退出即可
（过程中发现root没有 sudoers的修改权限，
chmod 720 sudoers ---》 ok )
hadoop 有 sudo的权限后，再次kill namenode 进程 ：依然显示没有这个进程
[hadoop@zui etc]$ sudo kill -9 18452
kill: sending signal to 18452 failed: No such process
（可是我日勒个去，执行hdfs namenode -format时候就是显示namenode is running 18452）
我fuck了自己，rm了 3.0.3,接下来使用2.6.0