Which statement is true about the Reduce phase of MapReduce?

Question: Which statement is true about the Reduce phase of MapReduce?

  1. Output results are sent to the client program.
  2. Data arrives from the Shuffle phase already sorted by key.
  3. The Reducer phase sums up the values associated with each key.
  4. Each Reduce task processes all the data for one key only.

Correct Answer: 2

About MapReduce and YARN

Apache Hadoop is one of the most popular tools for big data processing. It has been successfully deployed in production by many companies for several years. Though Hadoop is considered a reliable, scalable, and cost-effective solution, it is constantly being improved by a large community of developers.

As a result, the 2.0 version offers several revolutionary features, including Yet Another Resource Negotiator (YARN), HDFS Federation, and high availability, which make the Hadoop cluster much more efficient, powerful, and reliable.”

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