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List out the some common problems faced by data analyst?
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How many datanodes can run on a single Hadoop cluster?
Why use hadoop?
What is purpose of RecordWriter in Hadoop?
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?
Are job tracker and task trackers present in separate machines?
Explain Data Locality in Hadoop?
Give me examples of unstructured data?
What does hadoop-env.sh do?
What does rack awareness algorithm means and why is it utilized as a part of hadoop?
How can one write custom record reader?
What are input format, input split & record reader and what they do?
What is the difference between an inputsplit and a block?
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