What is a block and block scanner in HDFS?
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What is the difference between Gen1 and Gen2 Hadoop with regards to the Namenode?
Explain the use of tasktracker in the hadoop cluster?
What hadoop does in safe mode?
How can you overwrite the replication factors in HDFS?
Is hadoop based on google mapreduce?
Explain the features of pseudo mode?
How to restart Namenode?
Mention what is the number of default partitioner in Hadoop?
Explain the features of stand alone (local) mode?
Whats is distributed cache in hadoop?
What exactly is hadoop?
How will you make changes to the default configuration files?
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