Which modes can Hadoop be run in? List a few features for each mode?
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What is the best practice to deploy the secondary name node?
Web-ui shows that half of the datanodes are in decommissioning mode. What does that mean? Is it safe to remove those nodes from the network?
Why would nosql be better than using a sql database? And how much better is it?
Can you explain hadoop streaming?
What are the main features and Characteristics of Hadoop which makes it the most popular and powerful Big Data tool?
What is single node cluster in Hadoop? for what all purposes Hadoop run on a single node cluster?
Explain what is sequencefileinputformat?
What is streaming access?
Have you ever used counters in hadoop?
What happens if you get a ‘connection refused java exception’ when you type hadoop fsck /?
What is difference between secondary namenode, checkpoint namenode & backupnode?
What are the restriction to the key and value class ?
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