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. What if a Namenode has no data? If a Namenode…

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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’. (33)

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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. What does the command mapred.job.tracker do? The command mapred.job.tracker lists…

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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 the RAM? Spill factor is the size after which your…

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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. Fully distributed mode (21)

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