Bacic Questions and Answers For Freshers

41. Do we need to give a password, even if the key is added in SSH? Yes, password is still required even if the key is added in SSH. 42. …

31. Where is hadoop-env.sh file present? hadoop-env.sh file is present in the conf location. 32. In Hadoop_PID_DIR, what does PID stands for? PID stands for ‘Process ID’.

21. How can we check whether Namenode is working or not? To check whether Namenode is working or not, use the command /etc/init.d/hadoop-0.20-namenode status or as simple as jps. 22. …

11. How to exit the Vi editor? To exit the Vi Editor, press ESC and type :q and then press enter. 12. What is a spill factor with respect to …

1. Which are the three modes in which Hadoop can be run? The three modes in which Hadoop can be run are: 1. standalone (local) mode 2. Pseudo-distributed mode 3. …