[hadoop@zui hadoop]$ hadoop namenode -format

WARNING: Use of this script to execute namenode is deprecated.WARNING: Attempting to execute replacement "hdfs namenode" instead.

namenode is running as process 18452. Stop it first.

(3.0.3使用 ： hdfs namenode -formate)

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[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 18452Stopping datanodeslocalhost: ERROR: Unable to kill 19132Stopping secondary namenodes [zui]zui: ERROR: Unable to kill 19311

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[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 18452Stopping datanodeslocalhost: ERROR: Unable to kill 19132Stopping secondary namenodes [zui]zui: ERROR: Unable to kill 19311Stopping nodemanagersStopping resourcemanager

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[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 18452bash: kill: (18452) - No such process[root@zui hadoop]# sudo kill -9 18452kill: 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 )

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添加hadoop到 sudoers ：

例子：引用来自 ：

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 )

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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 18452kill: 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）

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我fuck了自己，rm了 3.0.3,接下来使用2.6.0