What happen when namenode enters in safemode in hadoop?
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Mention how hadoop is different from other data processing tools?
Which are the three modes in which hadoop can be run?
What happens if you don?t override the mapper methods and keep them as it is?
What happens when two clients try to access the same file in the hdfs?
Define a record reader?
What do you understand by standalone (or local) mode?
What is the characteristic of streaming API that makes it flexible run MapReduce jobs in languages like Perl, Ruby, Awk etc.?
What happens in text format?
What does rack awareness mean?
Mention what is the difference between an rdbms and hadoop?
Is it possible to have hadoop job output in multiple directories? If yes, how?
How can you native libraries be included in yarn jobs?
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