Explain how can you check whether namenode is working beside using the jps command?
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What did mean by data-node?
Explain how can you debug hadoop code?
What is a single point of failure in Hadoop 1 and how is it resolved in Hadoop 2?
Explain Data Locality in Hadoop?
What is data cleansing?
What is JPS? Why is it used in Hadoop?
How to add/delete a Node to the existing cluster?
What is the default replication factor in Hadoop and how will you change it?
Name the most common input formats defined in hadoop?
Explain the difference between an inputsplit and a block?
What is difference between secondary namenode, checkpoint namenode & backupnode?
How ordering in hdfs is finished?
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