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Mention how hadoop is different from other data processing tools?
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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?
Explain is it possible to search for files using wildcards?
Give me the examples of Columnar database ?
Explain what is storage and compute nodes?
What is the difference between TextInputFormat and KeyValueInputFormat class?
Can I set the number of reducers to zero?
Do we require two servers for the namenode and the datanodes?
Compare Apache Hadoop and Apache Spark?
Explain the difference between an inputsplit and a block?
How many InputSplits will be made by hadoop framework?
Is it possible to have hadoop job output in multiple directories? If yes, how?
What is KeyValueTextInputFormat in Hadoop?
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