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What happens if you don?t override the mapper methods and keep them as it is?


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More Hadoop General Interview Questions

What are the Hadoop features extended to its eco-system components ?

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Is it possible to rename the output file, and if so, how?

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While starting hadoop services, datanode service is not running?

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What is the default replication factor in Hadoop and how will you change it?

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What does the mapred.job.tracker command do?

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What is check pointing in hadoop?

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How Hadoop is cost-effective?

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Ideally what should be the replication factor in hadoop?

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After the Map phase finishes, the Hadoop framework does 'Partitioning, Shuffle and sort'. Explain what happens in this phase?

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Name the files which are used by the startup and shutdown commands?

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If datanodes increase, then do we need to upgrade namenode?

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What is the characteristic of streaming API that makes it flexible run MapReduce jobs in languages like Perl, Ruby, Awk etc.?

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