Explain what if rack 2 and datanode fails?
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What is the difference between Gen1 and Gen2 Hadoop with regards to the Namenode?
What are different hdfs dfs shell commands to perform copy operation?
How many JVMs run on a slave node?
How indexing is done in HDFS?
On which port does ssh work?
Data Engineer Given a list of followers in the format:123, 345234, 678345, 123…Where column one is the ID of the follower and column two is the ID of the followee. Find all mutual following pairs (the pair 123, 345 in the example above). How would you use Map/Reduce to solve the problem when the list does not fit in memory?
What is the jobtracker and what it performs in a hadoop cluster?
Explain the features of fully distributed mode?
What do you know about keyvaluetextinputformat?
Explain the wordcount implementation via hadoop framework ?
What is the function of NodeManager?
What are the modes in which Apache Hadoop run?