What are the most commonly defined input formats in Hadoop?
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What is a block and block scanner in HDFS?
What is Row Key?
Explain the difference between gen1 and gen2 hadoop with regards to the namenode?
What is the process to change the files at arbitrary locations in HDFS?
What is your favourite tool in the hadoop ecosystem?
How do you define "block" in HDFS?
If a data Node is full how it's identified?
How we can take Hadoop out of Safe Mode?
Define a datanode?
Whats is distributed cache in hadoop?
did you maintain the hadoop cluster in-house or used hadoop in the cloud?
What are active and passive "NameNodes"?
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