What is Apache Hadoop? Why is Hadoop essential for every Big Data application?
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What is version-id mismatch error in hadoop?
Is hadoop open source?
How many instances of tasktracker run on a hadoop cluster?
Explain a simple Map/Reduce problem.
Define a metadata?
Is hadoop a database?
What do shuffling do?
what are the nodes in the Hadoop cluster?
How does NameNode tackle DataNode failures?
What Mapper does?
What is the purpose of RawComparator interface?
Can we do online transactions(oltp) using hadoop?
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