What is Safemode in Apache Hadoop?
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Explain the shuffle?
What is the default block size in Hadoop 1 and in Hadoop 2? Can it be changed?
What is yarn in hadoop?
What is commodity hardware?
How the HDFS Blocks are replicated?
What are the benefits of block transfer?
Which files are used by the startup and shutdown commands?
How can you overwrite the replication factors in HDFS?
What if rack 2 and datanode fails?
How can I restart namenode?
Should we use RAID in Hadoop or not?
Why do we need a password-less ssh in fully distributed environment?
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