How to check if Hadoop daemons are running?

Question

What are simple commands to check if Hadoop daemons are running?

For example if I\'m trying to figure out why HDFS is not setup correctly I\'ll want to know a way to ch

Answer 1

To check deamons are running?

You can check with jps command

use use below commands also

ps -ef | grep -w namenode

ps -ef | grep -w datanode

ps -ef | grep -w tasktracker 

-w :- will help to fetch the exact string

If you have Superuser privilege then you can also use below one for the same:

./hadoop dfsadmin -report

Hope this will help !!!