Explain how do ‘map’ and ‘reduce’ works?


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More Apache Hadoop Interview Questions

Can hive run without hadoop?

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how can we change Replication Factor?

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How does NameNode tackle DataNode failures?

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Why do we use Hadoop?

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How many instances of a jobtracker run on hadoop cluster?

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Can Apache Kafka be used without Zookeeper?

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Is hadoop based on google mapreduce?

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How the Client communicates with HDFS?

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Explain the basic difference between traditional rdbms and hadoop?

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What is cloudera and why it is used?

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Should we use RAID in Hadoop or not?

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Mention what is the number of default partitioner in Hadoop?

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