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What happen when namenode enters in safemode in hadoop?


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More Hadoop General Interview Questions

Mention how hadoop is different from other data processing tools?

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Which are the three modes in which hadoop can be run?

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What happens if you don?t override the mapper methods and keep them as it is?

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What happens when two clients try to access the same file in the hdfs?

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Define a record reader?

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What do you understand by standalone (or local) mode?

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What is the characteristic of streaming API that makes it flexible run MapReduce jobs in languages like Perl, Ruby, Awk etc.?

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What happens in text format?

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What does rack awareness mean?

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Mention what is the difference between an rdbms and hadoop?

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Is it possible to have hadoop job output in multiple directories? If yes, how?

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How can you native libraries be included in yarn jobs?

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