What does block mean?
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What are configuration files in Hadoop?
How to restart NameNode or all the daemons in Hadoop?
What are the most common InputFormats in Hadoop?
What are the modes in which Hadoop run?
If DataNode increases, then do we need to upgrade NameNode?
How Hadoop’s CLASSPATH plays a vital role in starting or stopping in Hadoop daemons?
How namenode handles data node failures?
Are job tracker and task trackers present in separate machines?
Is it possible to provide multiple input to Hadoop? If yes then how?
What happen when namenode enters in safemode in hadoop?
What are the most common OutputFormat in Hadoop?
How can one check whether NameNode is working or not?
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