Answer / Shashank Sharma

The Reducer's Sort phase is responsible for sorting the intermediate key-value pairs that were produced by the Mapper tasks. This sorting allows the reducer to process the data in sorted order, which can be more efficient when performing aggregate operations like counting or summing.

What is the input type/format in MapReduce by default?

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Explain job scheduling through JobTracker

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Mention what is the next step after mapper or maptask?

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When Namenode is down what happens to job tracker?

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How to write a custom partitioner for a Hadoop MapReduce job?

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What do you understand by mapreduce?

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