What is output format in hadoop?
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What is difference between regular file system and HDFS?
What do you mean by taskinstance?
How is security achieved in Apache Hadoop?
Explain how do ‘map’ and ‘reduce’ works?
Explain what is the purpose of RecordReader in Hadoop?
How the HDFS Blocks are replicated?
What is column families? What happens if you alter the block size of ColumnFamily on an already populated database?
What is the difference between Hadoop and Traditional RDBMS?
Explain the wordcount implementation via hadoop framework ?
How to change Replication Factor For below cases ?
What if rack 2 and datanode fails?
How to restart Namenode?
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