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Why we cannot do aggregation (addition) in a mapper? Why we require reducer for that?


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More Apache Hadoop Interview Questions

Explain the use of .mecia class?

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How can I install Cloudera VM in my system?

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What is hbase in hadoop?

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Why do we need a password-less ssh in fully distributed environment?

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How a task is scheduled by a jobtracker?

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

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Explain the hadoop-core configuration?

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What is a JobTracker in Hadoop? How many instances of JobTracker run on a Hadoop Cluster?

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What is Apache Hadoop? Why is Hadoop essential for every Big Data application?

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What is unstructured data?

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What is a Task instance in Hadoop? Where does it run?1

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Can Hadoop be compared to NOSQL database like Cassandra?

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