Describe the Nature and Use of MapReduce and Apache Hadoop DATA-SCIENCE-FOUNDATIONS Practice Questions (Page 3)

Questions 11–15

1. 11application · medium

   A Hadoop cluster is running a MapReduce job. The job's map tasks are progressing, but the reduce tasks are not starting. Which component is responsible for allocating resources to the reduce tasks?

   • AResourceManager
   • BSecondary NameNode
   • CDataNode
   • DNameNode
   Reveal Solution Discussion Select an answer first
2. 12foundation · easy

   Why is Hadoop well-suited for data warehousing workloads?

   • AIt guarantees ACID transactions for all operations
   • BIt can store and process massive volumes of structured and semi-structured data in a scalable, cost-effective manner
   • CIt is optimized for handling small, frequently updated datasets
   • DIt provides low-latency, real-time query processing
   Reveal Solution Discussion Select an answer first
4. 13foundation · easy

   Which two components are considered the core of Apache Hadoop?

   • AMapReduce and Spark
   • BHBase and Hive
   • CHDFS and YARN
   • DZooKeeper and Oozie
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5. 14application · medium

   A company runs a Hadoop cluster for batch processing. They need to store large files reliably across multiple machines and also run MapReduce jobs that can recover from node failures. Which two core Hadoop components provide these capabilities?

   • AHBase for storage and ZooKeeper for coordination.
   • BHDFS for storage and YARN for resource management and job scheduling.
   • CNameNode for storage and DataNode for processing.
   • DMapReduce for storage and HDFS for processing.
   Reveal Solution Discussion Select an answer first
6. 15foundation · easy

   In the MapReduce programming model, what is the primary role of the map phase?

   • ATo read the input data and produce intermediate key-value pairs
   • BTo store the final output on HDFS
   • CTo aggregate all intermediate values associated with the same key
   • DTo partition the input data across multiple nodes
   Reveal Solution Discussion Select an answer first