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What are the four modules that make up the Apache Hadoop framework?
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What is the problem with small files in Hadoop?
Is it possible to provide multiple input to Hadoop? If yes then how?
Ideally what should be replication factor in a Hadoop cluster?
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?
Clarify what jobtracker is in hadoop? What are the activities followed by hadoop?
Can we deploy job tracker other than name node?
Suppose hadoop spawned 100 tasks for a job and one of the tasks failed. What will hadoop do?
Name the most common input formats defined in hadoop?
What are the tools used in big data?
What is the default replication factor in Hadoop and how will you change it?
Explain how can you debug hadoop code?
How to use combiner in hadoop ?
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