What is the default block size in hdfs?
What is Your Cluster size ?
How to configure hadoop to reuse JVM for mappers?
Which are the two types of 'writes' in HDFS?
when hadoop enter in safe mode?
Explain the shuffle?
Explain the wordcount implementation via hadoop framework ?
How the Client communicates with HDFS?
Define a job tracker?
Explain how is hadoop different from other data processing tools?
What is the functionality of jobtracker in hadoop? How many instances of a jobtracker run on hadoop cluster?
On what basis data will be stored on a rack?
Is map like a pointer?