What is a Secondary Namenode? Is it a substitute to the Namenode?
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What's the best way to copy files between HDFS clusters?
How did you debug your Hadoop code ?
What do you know about nlineoutputformat?
Where is the Mapper Output intermediate kay-value data stored ?
What is the function of NodeManager?
What is the relation between job and task in hadoop?
What alternate way does HDFS provides to recover data in case a Namenode
How many instances of a jobtracker run on hadoop cluster?
What is the problem with small files in Apache Hadoop?
Did you ever built a production process in hadoop ? If yes then what was the process when your hadoop job fails due to any reason?
What mechanism does hadoop framework provides to synchronize changes made in distribution cache during runtime of the application?
What is Rack awareness?
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