What is Row Key?
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On what basis Namenode will decide which datanode to write on?
what should be the ideal replication factor in hadoop?
What is Schema on Read and Schema on Write?
Explain the features of pseudo mode?
What is the relation between job and task in hadoop?
What is a block and block scanner in HDFS?
Do we need to give a password, even if the key is added in ssh?
How indexing is done in HDFS?
Explain why the name ‘hadoop’?
Is hadoop a memory?
What is HDFS Block size? How is it different from traditional file system block size?
What is the purpose of DataNode block scanner?
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