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More Apache Hadoop Interview Questions

What is the default block size in Hadoop 1 and in Hadoop 2? Can it be changed?

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Explain the hadoop-core configuration?

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How we can take Hadoop out of Safe Mode?

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What if a namenode has no data?

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In which location Name Node stores its Metadata and why?

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What happens to a namenode, when job tracker is down?

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How to enable recycle bin or trash in hadoop?

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What do masters consist of?

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What is the purpose of dfsadmin tool?

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Rack awareness of Namenode?

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What is the port number for NameNode

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How can I restart namenode?

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