linuxhadoop

How to check if Hadoop daemons are running?

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 check if namemonode/datanode/jobtracker/tasktracker are running on this machine.

Is there any way to check it fast without looking into logs or using ps(on Linux)?

Solution

  • I did not find great solution to it, so I used

    ps -ef | grep hadoop | grep -P  'namenode|datanode|tasktracker|jobtracker'

    just to see if stuff is running

    and 

    ./hadoop dfsadmin -report

    but last was not helpful until server was running.